Vulnerability-Lookup

GHSA-8WHX-V8QQ-PQ64

Vulnerability from github – Published: 2026-03-04 20:58 – Updated: 2026-03-06 21:57

Summary

changedetection.io has Reflected XSS in its RSS Tag Error Response

Details

A reflected cross-site scripting (XSS) vulnerability was identified in the /rss/tag/ endpoint of changedetection.io. The tag_uuid path parameter is reflected directly in the HTTP response body without HTML escaping. Since Flask returns text/html by default for plain string responses, the browser parses and executes injected JavaScript.

This vulnerability persists in version 0.54.1, which patched the related XSS in /rss/watch/ (CVE-2026-27645 / GHSA-mw8m-398g-h89w) but did not address the identical pattern in the tag RSS endpoint.

Package

Ecosystem: pip
Package: changedetection.io
Affected versions: <= 0.54.1
Patched versions: (none yet)

Severity

Moderate - CVSS 6.1 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

Details

File: changedetectionio/blueprint/rss/tag.py Line: 36 Source: tag.py @ 1d72716

The tag_uuid parameter from the URL path is interpolated into the response body using an f-string with no escaping:

tag = datastore.data['settings']['application'].get('tags', {}).get(tag_uuid)
if not tag:
    return f"Tag with UUID {tag_uuid} not found", 404  # ← No escaping, Content-Type: text/html

Flask's default Content-Type for plain string responses is text/html; charset=utf-8, so any HTML/JavaScript injected via {tag_uuid} is rendered and executed by the browser.

Relationship to CVE-2026-27645

CVE-2026-27645 (GHSA-mw8m-398g-h89w) addressed the identical vulnerability pattern in /rss/watch/ (single_watch.py). The fix applied in v0.54.1 patched that endpoint but did not fix the same pattern in /rss/tag/ (tag.py). Testing confirms:

/rss/watch/ on v0.54.1 — Returns generic 404 page, XSS no longer triggers ✅
/rss/tag/ on v0.54.1 — XSS payload still fires, vulnerability confirmed ❌

Attack Vector

The attack requires a valid RSS access token, which is a 32-character hex string exposed in the <link> HTML tag on the homepage without authentication:

Attacker visits the target's homepage (if unauthenticated) and extracts the RSS token from the <link> tag
Crafts a malicious URL:

``` http://target:5000/rss/tag/?token=EXTRACTED_TOKEN

```
Sends the link to a victim who has an active session on the changedetection.io instance
When the victim clicks the link, the server responds with:

``` Tag with UUID not found

```
The browser renders the <img> tag, the onerror fires, and JavaScript executes in the victim's session context

Proof of Concept

Request

GET /rss/tag/%3Cimg%20src%3Dx%20onerror%3Dalert(document.domain)%3E?token=60b83b06df98b24c66367bc3d233105b HTTP/1.1
Host: localhost:5000

Response

HTTP/1.1 404 NOT FOUND
Content-Type: text/html; charset=utf-8

Tag with UUID <img src=x onerror=alert(document.domain)> not found

The XSS payload is reflected unescaped in an HTML response. The browser executes alert(document.domain) and displays "localhost", confirming JavaScript execution.

Tested on: changedetection.io v0.54.1 (Docker, localhost, Feb 25, 2026)

https://github.com/user-attachments/assets/6db07f6a-6df8-48a7-a597-9f39dfa1bb29

Impact

Session cookie theft via document.cookie exfiltration
Account takeover if session cookies lack the HttpOnly flag
Phishing via crafted links that appear to originate from a trusted changedetection.io instance
Low exploitation barrier - the RSS token is obtainable without authentication from the homepage <link> tag
Widespread exposure - prior scanning of internet-facing instances (during CVE-2026-27645 research) identified 500+ publicly accessible deployments

Suggested Fix

Escape the tag_uuid parameter before reflecting it in the response, or set the Content-Type to text/plain:

Option A: HTML Escape (Recommended)

from markupsafe import escape

if not tag:
    return f"Tag with UUID {escape(tag_uuid)} not found", 404

Option B: Set Content-Type to text/plain

from flask import make_response

if not tag:
    resp = make_response(f"Tag with UUID {tag_uuid} not found", 404)
    resp.headers['Content-Type'] = 'text/plain; charset=utf-8'
    return resp

Credits

Roberto Nunes (@Akokonunes) - Reporter
neo-ai-engineer (@neo-ai-engineer) - Reporter

References

Related advisory: GHSA-mw8m-398g-h89w (CVE-2026-27645)
Vulnerable source: tag.py @ 1d72716

Severity

6.1 (Medium)


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

Show details on source website

JSON

To clipboard

{
  "affected": [
    {
      "package": {
        "ecosystem": "PyPI",
        "name": "changedetection.io"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "0.54.4"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-29038"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-79"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-03-04T20:58:14Z",
    "nvd_published_at": "2026-03-06T07:16:01Z",
    "severity": "MODERATE"
  },
  "details": "A reflected cross-site scripting (XSS) vulnerability was identified in the `/rss/tag/` endpoint of changedetection.io. The `tag_uuid` path parameter is reflected directly in the HTTP response body without HTML escaping. Since Flask returns `text/html` by default for plain string responses, the browser parses and executes injected JavaScript.\n\nThis vulnerability persists in version **0.54.1**, which patched the related XSS in `/rss/watch/` (CVE-2026-27645 / GHSA-mw8m-398g-h89w) but did not address the identical pattern in the tag RSS endpoint.\n\n## Package\n\n-   **Ecosystem:** pip\n-   **Package:** changedetection.io\n-   **Affected versions:** \u003c= 0.54.1\n-   **Patched versions:** _(none yet)_\n\n\n## Severity\n**Moderate - CVSS 6.1**\n`CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N`\n\n\n## Details\n**File:** `changedetectionio/blueprint/rss/tag.py` **Line:** 36 **Source:** [tag.py @ 1d72716](https://raw.githubusercontent.com/dgtlmoon/changedetection.io/1d72716c6988a4f6796bb85a5d42872800cd7a70/changedetectionio/blueprint/rss/tag.py)\n\nThe `tag_uuid` parameter from the URL path is interpolated into the response body using an f-string with no escaping:\n\n```python\ntag = datastore.data[\u0027settings\u0027][\u0027application\u0027].get(\u0027tags\u0027, {}).get(tag_uuid)\nif not tag:\n    return f\"Tag with UUID {tag_uuid} not found\", 404  # \u2190 No escaping, Content-Type: text/html\n\n```\n\nFlask\u0027s default `Content-Type` for plain string responses is `text/html; charset=utf-8`, so any HTML/JavaScript injected via `{tag_uuid}` is rendered and executed by the browser.\n\n### Relationship to CVE-2026-27645\n\nCVE-2026-27645 (GHSA-mw8m-398g-h89w) addressed the identical vulnerability pattern in `/rss/watch/` (`single_watch.py`). The fix applied in v0.54.1 patched that endpoint but **did not** fix the same pattern in `/rss/tag/` (`tag.py`). Testing confirms:\n\n-   **`/rss/watch/` on v0.54.1** \u2014 Returns generic 404 page, XSS no longer triggers \u2705\n-   **`/rss/tag/` on v0.54.1** \u2014 XSS payload still fires, vulnerability confirmed \u274c\n\n## Attack Vector\n\nThe attack requires a valid RSS access token, which is a 32-character hex string exposed in the `\u003clink\u003e` HTML tag on the homepage without authentication:\n\n1.  Attacker visits the target\u0027s homepage (if unauthenticated) and extracts the RSS token from the `\u003clink\u003e` tag\n2.  Crafts a malicious URL:\n    \n    ```\n    http://target:5000/rss/tag/\u003cimg src=x onerror=alert(document.cookie)\u003e?token=EXTRACTED_TOKEN\n    \n    ```\n    \n3.  Sends the link to a victim who has an active session on the changedetection.io instance\n4.  When the victim clicks the link, the server responds with:\n    \n    ```\n    Tag with UUID \u003cimg src=x onerror=alert(document.cookie)\u003e not found\n    \n    ```\n    \n5.  The browser renders the `\u003cimg\u003e` tag, the `onerror` fires, and JavaScript executes in the victim\u0027s session context\n\n## Proof of Concept\n\n### Request\n\n```http\nGET /rss/tag/%3Cimg%20src%3Dx%20onerror%3Dalert(document.domain)%3E?token=60b83b06df98b24c66367bc3d233105b HTTP/1.1\nHost: localhost:5000\n\n```\n\n### Response\n\n```http\nHTTP/1.1 404 NOT FOUND\nContent-Type: text/html; charset=utf-8\n\nTag with UUID \u003cimg src=x onerror=alert(document.domain)\u003e not found\n\n```\n\nThe XSS payload is reflected unescaped in an HTML response. The browser executes `alert(document.domain)` and displays \"localhost\", confirming JavaScript execution.\n\n**Tested on:** changedetection.io v0.54.1 (Docker, localhost, Feb 25, 2026)\n\n\nhttps://github.com/user-attachments/assets/6db07f6a-6df8-48a7-a597-9f39dfa1bb29\n\n\n## Impact\n\n-   **Session cookie theft** via `document.cookie` exfiltration\n-   **Account takeover** if session cookies lack the `HttpOnly` flag\n-   **Phishing** via crafted links that appear to originate from a trusted changedetection.io instance\n-   **Low exploitation barrier** - the RSS token is obtainable without authentication from the homepage `\u003clink\u003e` tag\n-   **Widespread exposure** - prior scanning of internet-facing instances (during CVE-2026-27645 research) identified 500+ publicly accessible deployments\n\n## Suggested Fix\n\nEscape the `tag_uuid` parameter before reflecting it in the response, or set the `Content-Type` to `text/plain`:\n\n### Option A: HTML Escape (Recommended)\n\n```python\nfrom markupsafe import escape\n\nif not tag:\n    return f\"Tag with UUID {escape(tag_uuid)} not found\", 404\n\n```\n\n### Option B: Set Content-Type to text/plain\n\n```python\nfrom flask import make_response\n\nif not tag:\n    resp = make_response(f\"Tag with UUID {tag_uuid} not found\", 404)\n    resp.headers[\u0027Content-Type\u0027] = \u0027text/plain; charset=utf-8\u0027\n    return resp\n\n```\n## Credits\n\n-   **Roberto Nunes** ([@Akokonunes](https://github.com/Akokonunes)) - Reporter\n-   **neo-ai-engineer** ([@neo-ai-engineer](https://github.com/neo-ai-engineer)) - Reporter\n\n## References\n-   Related advisory: [GHSA-mw8m-398g-h89w](https://github.com/dgtlmoon/changedetection.io/security/advisories/GHSA-mw8m-398g-h89w) (CVE-2026-27645)\n-   Vulnerable source: [tag.py @ 1d72716](https://raw.githubusercontent.com/dgtlmoon/changedetection.io/1d72716c6988a4f6796bb85a5d42872800cd7a70/changedetectionio/blueprint/rss/tag.py)",
  "id": "GHSA-8whx-v8qq-pq64",
  "modified": "2026-03-06T21:57:09Z",
  "published": "2026-03-04T20:58:14Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/dgtlmoon/changedetection.io/security/advisories/GHSA-8whx-v8qq-pq64"
    },
    {
      "type": "WEB",
      "url": "https://github.com/dgtlmoon/changedetection.io/security/advisories/GHSA-mw8m-398g-h89w"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-29038"
    },
    {
      "type": "WEB",
      "url": "https://github.com/dgtlmoon/changedetection.io/commit/ec7d56f85d1e9690fca7cb4711c1fb20dffec780"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/dgtlmoon/changedetection.io"
    },
    {
      "type": "WEB",
      "url": "https://github.com/dgtlmoon/changedetection.io/releases/tag/0.54.4"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N",
      "type": "CVSS_V3"
    }
  ],
  "summary": "changedetection.io has Reflected XSS in its RSS Tag Error Response"
}

CVE-2026-29038 (GCVE-0-2026-29038)

Vulnerability from cvelistv5 – Published: 2026-03-06 06:53 – Updated: 2026-03-09 19:57

Title

changedetection.io: Reflected XSS in RSS Tag Error Response

Summary

changedetection.io is a free open source web page change detection tool. Prior to version 0.54.4, there is a reflected cross-site scripting (XSS) vulnerability identified in the /rss/tag/ endpoint of changedetection.io. The tag_uuid path parameter is reflected directly in the HTTP response body without HTML escaping. Since Flask returns text/html by default for plain string responses, the browser parses and executes injected JavaScript. This issue has been patched in version 0.54.4.

Severity

6.1 (Medium)


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

SSVC

Exploitation: poc Automatable: no Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-03-09 19:57 UTC

CWE

CWE-79 - Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

Assigner

GitHub_M mitre root

References

3 references

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

Impacted products

1 product

Vendor	Product	Version
dgtlmoon	changedetection.io	Affected: < 0.54.4

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2026-29038",
                "options": [
                  {
                    "Exploitation": "poc"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-03-09T19:57:33.784446Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-03-09T19:57:44.702Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "product": "changedetection.io",
          "vendor": "dgtlmoon",
          "versions": [
            {
              "status": "affected",
              "version": "\u003c 0.54.4"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "changedetection.io is a free open source web page change detection tool. Prior to version 0.54.4, there is a reflected cross-site scripting (XSS) vulnerability identified in the /rss/tag/ endpoint of changedetection.io. The tag_uuid path parameter is reflected directly in the HTTP response body without HTML escaping. Since Flask returns text/html by default for plain string responses, the browser parses and executes injected JavaScript. This issue has been patched in version 0.54.4."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "attackComplexity": "LOW",
            "attackVector": "NETWORK",
            "availabilityImpact": "NONE",
            "baseScore": 6.1,
            "baseSeverity": "MEDIUM",
            "confidentialityImpact": "LOW",
            "integrityImpact": "LOW",
            "privilegesRequired": "NONE",
            "scope": "CHANGED",
            "userInteraction": "REQUIRED",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N",
            "version": "3.1"
          }
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-79",
              "description": "CWE-79: Improper Neutralization of Input During Web Page Generation (\u0027Cross-site Scripting\u0027)",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-03-06T06:53:56.959Z",
        "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
        "shortName": "GitHub_M"
      },
      "references": [
        {
          "name": "https://github.com/dgtlmoon/changedetection.io/security/advisories/GHSA-8whx-v8qq-pq64",
          "tags": [
            "x_refsource_CONFIRM"
          ],
          "url": "https://github.com/dgtlmoon/changedetection.io/security/advisories/GHSA-8whx-v8qq-pq64"
        },
        {
          "name": "https://github.com/dgtlmoon/changedetection.io/commit/ec7d56f85d1e9690fca7cb4711c1fb20dffec780",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/dgtlmoon/changedetection.io/commit/ec7d56f85d1e9690fca7cb4711c1fb20dffec780"
        },
        {
          "name": "https://github.com/dgtlmoon/changedetection.io/releases/tag/0.54.4",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/dgtlmoon/changedetection.io/releases/tag/0.54.4"
        }
      ],
      "source": {
        "advisory": "GHSA-8whx-v8qq-pq64",
        "discovery": "UNKNOWN"
      },
      "title": "changedetection.io: Reflected XSS in RSS Tag Error Response"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
    "assignerShortName": "GitHub_M",
    "cveId": "CVE-2026-29038",
    "datePublished": "2026-03-06T06:53:56.959Z",
    "dateReserved": "2026-03-03T17:50:11.242Z",
    "dateUpdated": "2026-03-09T19:57:44.702Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

PYSEC-2026-2127

Vulnerability from pysec - Published: 2026-03-06 07:16 - Updated: 2026-07-13 05:48

Details

Severity

6.1 (Medium)


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

Impacted products

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

Aliases

JSON

To clipboard

{
  "affected": [
    {
      "ecosystem_specific": {},
      "package": {
        "ecosystem": "PyPI",
        "name": "changedetection-io",
        "purl": "pkg:pypi/changedetection-io"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "0.54.4"
            }
          ],
          "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",
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        "0.39.13.1",
        "0.39.14",
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        "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",
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        "0.39.5",
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        "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",
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        "0.45.15",
        "0.45.16",
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        "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"
      ]
    }
  ],
  "aliases": [
    "CVE-2026-29038",
    "GHSA-8whx-v8qq-pq64"
  ],
  "details": "changedetection.io is a free open source web page change detection tool. Prior to version 0.54.4, there is a reflected cross-site scripting (XSS) vulnerability identified in the /rss/tag/ endpoint of changedetection.io. The tag_uuid path parameter is reflected directly in the HTTP response body without HTML escaping. Since Flask returns text/html by default for plain string responses, the browser parses and executes injected JavaScript. This issue has been patched in version 0.54.4.",
  "id": "PYSEC-2026-2127",
  "modified": "2026-07-13T05:48:12.243656Z",
  "published": "2026-03-06T07:16:01.393Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://github.com/dgtlmoon/changedetection.io/releases/tag/0.54.4"
    },
    {
      "type": "FIX",
      "url": "https://github.com/dgtlmoon/changedetection.io/commit/ec7d56f85d1e9690fca7cb4711c1fb20dffec780"
    },
    {
      "type": "EVIDENCE",
      "url": "https://github.com/dgtlmoon/changedetection.io/security/advisories/GHSA-8whx-v8qq-pq64"
    }
  ],
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N",
      "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.

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-8WHX-V8QQ-PQ64

Package

Severity

Details

Relationship to CVE-2026-27645

Attack Vector

Proof of Concept

Request

Response

Impact

Suggested Fix

Option A: HTML Escape (Recommended)

Option B: Set Content-Type to text/plain

Credits

References

CVE-2026-29038 (GCVE-0-2026-29038)

PYSEC-2026-2127

Tags

Sightings

Nomenclature

Related by attack behaviour