Cross-site scripting in AVideo - CVE-2026-49279
Published: November 11, 2026
Vulnerability identifier: #VU165920
CSH Severity: Medium
CVSS v4: 5.1 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N]
CVE-ID: CVE-2026-49279
CWE-ID: CWE-79
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to execute arbitrary JavaScript in other users' browsers through stored cross-site scripting.
The vulnerability exists due to improper input neutralization in AVideo's MessageSQLite.php WebSocket handler when msgToResourceId() prioritizes the unsanitized json key over the sanitized msg key. A remote attacker can place an autoEvalCodeOnHTML payload in the json key instead of msg to bypass sanitization and execute JavaScript when the message is processed in a victim's browser.
Affected software
AVideo
How to mitigate CVE-2026-49279
Install security update from vendor's website.
AVideo - update to 14.3.1