Auth bypass in Wwbn Avideo
CVE-2026-86721
AVideo through commit c3edcc274c contains an authorization bypass vulnerability where a session cookie named 'key' with value 'value' overrides the $_REQUEST['key'] parameter in saveLive.php and related endpoints. Attackers can publish to any user's RTMP stream without authentication by using the known constant stream key value to hijack live broadcasts.
Vulnerability class: Broken Authentication
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N.
EPSS exploit prediction
EPSS: 0.005 (41.6th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 42nd percentile — 41.6% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.005 · newest: 0.005 · change: 0.000
Affected products
Weakness classification (CWE)
References
- github.com/WWBN/AVideo/security/advisories/GHSA-5664-h9h4-3gwc (vendor-advisory)
- www.vulncheck.com/advisories/avideo-through-c3edcc274c-authorization-bypass-via… (third-party-advisory)
Frequently asked questions
- What is CVE-2026-86721?
- CVE-2026-86721 is a high-severity vulnerability in Wwbn Avideo, classified under Improper Authentication. CVSS score: 7.5/10. Published 2026-09-08.
- How severe is CVE-2026-86721?
- High severity. CVSS v3 base score is 7.5 out of 10.