PT-2026-37294 · Avideo · Avideo

Offset · Published 2026-05-05 · Updated 2026-05-11 · CVE-2026-43878

Positive Technologies (AI Summary)

CVSS v3.1

6.1

Medium

Base vector

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

Name of the Vulnerable Software and Affected Versions AVideo versions prior to 29.1

Description An issue exists where the 'plugin/Meet/iframe.php' endpoint echoes the user and pass query parameters unescaped into a JavaScript double-quoted string literal within a <script> block. This allows an attacker to send a crafted URL to a victim, breaking out of the string to execute arbitrary JavaScript in the victim's browser under the AVideo origin. This can occur without authentication if a public Meet schedule exists on the target. The root cause involves a two-step reflection where the loginFromRequestToGet() function returns raw concatenation of request parameters without sanitization, which is then emitted into a JS string literal without escaping.

Recommendations For versions prior to 29.1, apply JSON encoding at the sink in 'plugin/Meet/iframe.php' to ensure the string remains a valid JS literal. Additionally, update the loginFromRequestToGet() function in 'objects/user.php' to use rawurlencode for the user and pass parameters.

Exploit

Fix

XSS

Weakness Enumeration

CWE-79

Related Identifiers

CVE-2026-43878

GHSA-MM5F-8Q57-4FC4

Affected Products

Avideo

References · 6

• 🔥 https://github.com/WWBN/AVideo/security/advisories/GHSA-mm5f-8q57-4fc4 · Exploit
• https://nvd.nist.gov/vuln/detail/CVE-2026-43878 · Security Note
• https://osv.dev/vulnerability/GHSA-mm5f-8q57-4fc4 · Vendor Advisory
• https://github.com/WWBN/AVideo · Note
• https://github.com/WWBN/AVideo/commit/3298ced2bcf92e4f3acff6ce9bde14edf42ecb5b · Note
• https://t.me/CVEtracker/53409 · Telegram Post