What is CVE-2026-33043?

CVE-2026-33043 is a high-severity vulnerability in Wwbn Avideo, classified under Permissive Cross-domain Policy with Untrusted Domains. CVSS score: 8.1/10. Published 2026-03-20.

How severe is CVE-2026-33043?

High severity. CVSS v3 base score is 8.1 out of 10.

Vulnerability in Wwbn Avideo

CVE-2026-33043

WWBN AVideo is an open source video platform. In versions 25.0 and below, /objects/phpsessionid.json.php exposes the current PHP session ID to any unauthenticated request. The allowOrigin() function reflects any Origin header back in Access-Control-Allow-Origin with Access-Control-Allow-Credentials: true, enabling cross-origin session theft and full account takeover. This issue has been fixed in version 26.0.

Published 2026-03-20 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 8.1 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N.

EPSS exploit prediction

EPSS: 0.004 (30.6th percentile), scored 2026-09-30.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 31st percentile — 30.6% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.003 · newest: 0.004 · change: +0.000

Affected products

Wwbn Avideo — versions < 26.0

Weakness classification (CWE)

CWE-942 — Permissive Cross-domain Policy with Untrusted Domains

References

github.com/WWBN/AVideo/security/advisories/GHSA-qc3p-398r-p59j (Exploit, Vendor Advisory)
github.com/WWBN/AVideo/commit/9f4f51e5df5e3343400f9d0068705f5482b6f930 (Patch)

Frequently asked questions

What is CVE-2026-33043?: CVE-2026-33043 is a high-severity vulnerability in Wwbn Avideo, classified under Permissive Cross-domain Policy with Untrusted Domains. CVSS score: 8.1/10. Published 2026-03-20.
How severe is CVE-2026-33043?: High severity. CVSS v3 base score is 8.1 out of 10.