CVE-2026-84479

critical · 9.3

WWBN AVideo (current e01e41ecc and earlier) makes three login-time security controls depend solely on the client-supplied User-Agent header. The isAVideoEncoder()/isAVideoMobileApp() checks match HTTP_USER_AGENT against a hardcoded literal ("AVideoEncoder"/"AVideoMobileApp") with no IP check or shared secret. An attacker who submits valid credentials and sets User-Agent: AVideoEncoder bypasses two-factor authentication, skips brute-force captcha escalation, and avoids being recorded in the login/device audit history. No patch is available at the time of publication.

9.3

CVSS

0.5%

EPSS (exploit prob.)

46th

EPSS percentile

2026-09-01

Published

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

Weaknesses

CWE-290

References

https://github.com/WWBN/AVideo/security/advisories/GHSA-m9m3-gwh2-337c
https://www.vulncheck.com/advisories/wwbn-avideo-authentication-bypass-via-user-agent-header
https://github.com/WWBN/AVideo/security/advisories/GHSA-m9m3-gwh2-337c

Query this programmatically:

curl https://evil-db.io/api/v1/cve/CVE-2026-84479