---
id: CVE-2026-15723
title: >-
  Improper Neutralization of Special Elements used in an LDAP Query ('LDAP
  Injection') in GitLab
summary: >-
  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 …
severity: high
cvss: 8.2
cvssVector: 'CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:N'
cvssSource: cna
cwe:
  - CWE-90
vendor: GitLab
product: GitLab
affected:
  - GitLab >= 10.1 < 19.3.6
  - GitLab >= 19.4 < 19.4.3
  - GitLab >= 19.5 < 19.5.1
published: '2026-10-21'
updated: '2026-10-21'
sourceUpdated: '2026-10-21T23:35:15.434Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-15723'
references:
  - url: 'https://gitlab.com/gitlab-org/gitlab/-/work_items/605977'
  - url: 'https://hackerone.com/reports/3852192'
    label: 'HackerOne Bug Bounty Report #3852192'
  - url: >-
      https://docs.gitlab.com/releases/patches/patch-release-gitlab-19-5-1-released/
tags:
  - cve.org
ingestedAt: '2026-10-22T00:21:21.865Z'
---

## Overview

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.

## Affected

- `GitLab >= 10.1 < 19.3.6`
- `GitLab >= 19.4 < 19.4.3`
- `GitLab >= 19.5 < 19.5.1`

## Remediation

Upgrade to versions 19.3.6, 19.4.3, 19.5.1 or above.