CVE-2026-15723
Received Received - Intake

GitLab CE/EE OmniAuth SAML LDAP Account Takeover

Publication date: 2026-10-22

Last updated on: 2026-10-22

Assigner: GitLab Inc.

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.

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Meta Information

Published
2026-10-22
Last Modified
2026-10-22
Generated
2026-10-22
AI Q&A
2026-10-22
EPSS Evaluated
N/A
NVD
CVE-2026-15723

Affected Vendors & Products

Showing 3 associated CPEs
Vendor Product Version / Range
GitLab GitLab 10.1
GitLab GitLab 19.4
GitLab GitLab 19.5

Helpful Resources

Exploitability

CWE
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KEV
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CWE ID Description
CWE-90 The product constructs all or part of an LDAP query using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the intended LDAP query when it is sent to a downstream component.

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Executive Summary

This vulnerability in GitLab CE/EE allows an authenticated user to take over an existing LDAP-backed account without the target user's interaction. It occurs when both OmniAuth SAML and LDAP auto-linking are enabled. The issue stems from improper input sanitization during the LDAP email lookup path used for OmniAuth identity linking.

Impact Analysis

An attacker could gain unauthorized access to sensitive data or systems by hijacking an LDAP-backed account. This could lead to data breaches, unauthorized modifications, or further lateral movement within the affected environment.

Compliance Impact

This vulnerability could lead to unauthorized access to personal or sensitive data, violating GDPR and HIPAA compliance requirements. Organizations may face legal penalties, reputational damage, and loss of trust due to non-compliance resulting from this security flaw.

Mitigation Strategies

Upgrade GitLab to a patched version (19.3.6, 19.4.3, or 19.5.1 or later) to address the improper input sanitization in LDAP email lookup during OmniAuth identity linking.

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