# CVE-2026-15723: GitLab authentication bypass in OmniAuth SAML/LDAP auto-linking

Source: https://junglewise.ai/threats/cve-2026-15723-gitlab-has-remediated-an-issue-in-gitlab-ce-ee-affecting-all  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-10-22. Updated: 2026-10-22  
License: CC BY 4.0 with a link back

CVE-2026-15723 · Severity: high · CVSS 8.2 · Published 2026-10-22

GitLab is a web-based platform for managing source code repositories and CI/CD pipelines. When both OmniAuth SAML and LDAP auto-linking are enabled, an authenticated attacker can hijack existing LDAP-backed accounts without the target user's knowledge or interaction. This could lead to unauthorized access to code repositories and sensitive project data.

Technologies: [GitLab Community Edition](https://junglewise.ai/threats/technologies/gitlab-ce), [GitLab Enterprise Edition](https://junglewise.ai/threats/technologies/gitlab-ee). Vendors: [GitLab](https://junglewise.ai/threats/vendors/gitlab).

## Quick answers

**Is CVE-2026-15723 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-15723 being exploited in the wild.

**How severe is CVE-2026-15723?** High severity, with a CVSS score of 8.2, published 22 October 2026.

**Which products and versions are affected?** GitLab Community Edition 10.1 before 19.3.6, 19.4 before 19.4.3, 19.5 before 19.5.1; GitLab Enterprise Edition 10.1 before 19.3.6, 19.4 before 19.4.3, 19.5 before 19.5.1.

**Is there a fix for CVE-2026-15723?** Yes: fixed in 19.3.6, 19.4.3, 19.5.1, 19.2.9, 19.1.9, 19.0.10, 18.11.13. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**How is CVE-2026-15723 attacked?** It is attacked over the network, in a web application.

**Am I affected by CVE-2026-15723?** Check whether you run GitLab Community Edition or GitLab Enterprise Edition at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## How to fix

- Fixed in 19.3.6, 19.4.3, 19.5.1, 19.2.9, 19.1.9, 19.0.10, 18.11.13

## Technical details

An improper input sanitization vulnerability in the LDAP email lookup path during OmniAuth identity linking allows an authenticated user to take over LDAP-backed accounts. The vulnerability requires both OmniAuth SAML and LDAP auto-linking to be enabled, and the attacker must be an authenticated user. The flaw permits account hijacking without any user interaction from the victim.

## Affected products

- GitLab Community Edition 10.1 before 19.3.6, 19.4 before 19.4.3, 19.5 before 19.5.1
- GitLab Enterprise Edition 10.1 before 19.3.6, 19.4 before 19.4.3, 19.5 before 19.5.1

## Timeline

- 2026-10-22: disclosed
- 2026-10-21: patched

## References

- [https://docs.gitlab.com/releases/patches/patch-release-gitlab-19-5-1-released/](https://docs.gitlab.com/releases/patches/patch-release-gitlab-19-5-1-released/)
- [https://gitlab.com/gitlab-org/gitlab/-/work_items/605977](https://gitlab.com/gitlab-org/gitlab/-/work_items/605977)

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