CVE-2026-41076

HIGH 8.1

RT: LDAP authentication bypass via empty password

CVSS Score

8.1

EPSS Score

0.1%

EPSS Percentile

19th

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.

CWE	CWE-287
Vendor	bestpractical
Product	rt
Published	May 22, 2026
Last Updated	May 28, 2026

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CVSS v3 Breakdown

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

Attack Vector

Network

Attack Complexity

High

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

Affected Versions

bestpractical / rt

< 5.0.10 >= 6.0.0, < 6.0.3

References

NVD ↗ CVE.org ↗ EPSS Data ↗

github.com: https://github.com/bestpractical/rt/security/advisories/GHSA-3w28-fmcr-mjjx github.com: https://github.com/bestpractical/rt/releases/tag/rt-5.0.10 github.com: https://github.com/bestpractical/rt/releases/tag/rt-6.0.3