CVE-2026-44961 Auth bypass in Adserver
Attackers can bypass validation in the XML-RPC API to create malicious usernames, enabling impersonation or stored XSS attacks in Revive Adserver.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-44961?
CVE-2026-44961 is an authentication bypass vulnerability in Revive Adserver, published on 23 Jun 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
The XML‑RPC API addUser method has a validation bypass introduced in the fix for CVE‑2025‑55129. As a result, API users could create usernames that enabled impersonation or stored XSS attacks. Proper validation has been added where it was missing.
Weakness: CWE-287
Which versions are affected by CVE-2026-44961?
How do I fix CVE-2026-44961?
No fix has been published for CVE-2026-44961 yet. Limit exposure of the affected software until one is available.
Upgrade, and rotate credentials and sessions that may have been exposed. More about Authentication bypass.
Is CVE-2026-44961 being exploited?
There is no known exploitation of CVE-2026-44961 in the wild and no public exploit code.
Sources
Also known as GHSA-9wv7-mm8f-m6cx.