Vulnerability Description
WWBN AVideo is an open source video platform. In versions up to and including 29.0, objects/sendEmail.json.php exposes two branches depending on whether contactForm=1 is submitted. When the parameter is omitted, the endpoint sets $sendTo to an attacker-supplied email and, for unauthenticated callers, uses the site's own contact email as the message From:/Reply-To:. The endpoint is explicitly allow-listed as a "public write action" in objects/functionsSecurity.php (line 885), so it requires no authentication or CSRF token. An unauthenticated attacker (solving a captcha) can force the site's own SMTP infrastructure to send attacker-composed emails to arbitrary recipients with the site's legitimate sender address, passing SPF/DKIM/DMARC for the site's domain — ideal for targeted phishing and brand impersonation. Commit 4e3709895857a5857f0edb46b0ee984de0d9e1a2 contains an updated fix.
CVSS Score
MEDIUM
Related Weaknesses (CWE)
References
- https://github.com/WWBN/AVideo/commit/4e3709895857a5857f0edb46b0ee984de0d9e1a2
- https://github.com/WWBN/AVideo/security/advisories/GHSA-5hgj-7gm9-cff5
- https://github.com/WWBN/AVideo/security/advisories/GHSA-5hgj-7gm9-cff5
FAQ
What is CVE-2026-43880?
CVE-2026-43880 is a vulnerability with a CVSS score of 5.3 (MEDIUM). WWBN AVideo is an open source video platform. In versions up to and including 29.0, objects/sendEmail.json.php exposes two branches depending on whether contactForm=1 is submitted. When the parameter ...
How severe is CVE-2026-43880?
CVE-2026-43880 has been rated MEDIUM with a CVSS base score of 5.3/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-43880?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.