by Kastro
Paper/Archive/CVE-2026-84479

CVE-2026-84479

WWBN AVideo — WWBN AVideo Authentication Bypass via User-Agent Header

EPSS 0.5%public exploitCVSS 9.3
critical.is priorityof 100
47
CVSS 9.3 (CNA)9.3 / 10 × 3027.9Not in CISA KEV+300.0EPSS percentile 46.0.460 × 209.2Exploit: SSVC poc+1010.0SSVC exploitation: poc+100.0
Description · from the CVE record

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.

Affected

ProductAffectedFixed inSource
AVideo≤ 29.0–CNA

Scores by source

VulnCheck (CNA)9.3CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N
VulnCheck (CNA)9.1CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
CISA ADPSSVCExploitation: poc · Automatable: yes · Technical impact: partial

References

exploitgithub.com/WWBN/AVideo/security/advisories/GHSA-m9m3-gwh2-337cwriteupvulncheck.com/advisories/wwbn-avideo-authentication-bypass-via-user-agent-header