CVE-2026-41076 RT: LDAP authentication bypass via empty password
Attackers can bypass authentication in RT installations using LDAP/AD under specific server configurations, gaining unauthorized access to user accounts.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-41076?
CVE-2026-41076 is a high-severity authentication bypass vulnerability in bestpractical rt, published on 22 May 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
RT is an open source, enterprise-grade issue and ticket tracking system. Versions 5.0.9 and prior in addition to 6.0.0 through 6.0.2 contain an authentication bypass vulnerability in RT installations that use LDAP/AD for user authentication. Under certain LDAP server configurations, an attacker may be able to authenticate as any LDAP-backed RT user without supplying valid credentials. This issue has been fixed in versions 5.0.10 and 6.0.3. If developers are unable to upgrade immediately, they can temporarily work around this issue by reviewing their LDAP server's authentication policy to ensure it rejects unauthenticated bind attempts. Upgrading RT remains the recommended fix.
Weakness: CWE-287
Which versions are affected by CVE-2026-41076?
How do I fix CVE-2026-41076?
Upgrade to a fixed version.
Upgrade, and rotate credentials and sessions that may have been exposed. More about Authentication bypass.
Is CVE-2026-41076 being exploited?
There is no known exploitation of CVE-2026-41076 in the wild and no public exploit code.
Sources
Also known as DEBIAN-CVE-2026-41076, GHSA-3w28-fmcr-mjjx, UBUNTU-CVE-2026-41076.