CVE-2026-10086
Received Received - Intake
Client-Side Code Execution in GitLab EE

Publication date: 2026-06-25

Last updated on: 2026-06-25

Assigner: GitLab Inc.

Description
GitLab has remediated an issue in GitLab EE affecting all versions from 16.4 before 18.11.6, 19.0 before 19.0.3, and 19.1 before 19.1.1 that under certain conditions could have allowed an authenticated user with developer-role permissions to execute arbitrary client-side code in the context of another user's session, due to improper sanitization of user-supplied input.
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Meta Information
Published
2026-06-25
Last Modified
2026-06-25
Generated
2026-06-25
AI Q&A
2026-06-25
EPSS Evaluated
N/A
NVD
CVE-2026-10086
EUVD
EUVD-2026-39181
Affected Vendors & Products
Showing 3 associated CPEs
Vendor Product Version / Range
gitlab gitlab_ee From 16.4 (inc) to 18.11.6 (exc)
gitlab gitlab_ee From 19.0 (inc) to 19.0.3 (exc)
gitlab gitlab_ee From 19.1 (inc) to 19.1.1 (exc)
Helpful Resources
Exploitability
CWE
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KEV
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CWE ID Description
CWE-79 The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users.
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Executive Summary

This vulnerability in GitLab Enterprise Edition (EE) affects versions from 16.4 before 18.11.6, 19.0 before 19.0.3, and 19.1 before 19.1.1. It allows an authenticated user with developer-role permissions to execute arbitrary client-side code within the context of another user's session. This occurs due to improper sanitization of user-supplied input, which means malicious input is not properly cleaned or validated before being processed.

Impact Analysis

The impact of this vulnerability is significant because it allows an attacker with developer-level access to execute arbitrary client-side code as another user. This can lead to session hijacking, unauthorized actions performed on behalf of other users, and potential compromise of sensitive data. The CVSS score of 8.7 indicates a high severity with high confidentiality and integrity impact, though no impact on availability.

Mitigation Strategies

To mitigate this vulnerability, you should upgrade GitLab Enterprise Edition (EE) to a patched version. Specifically, update to version 18.11.6 or later if you are on the 16.4 to before 18.11.6 range, version 19.0.3 or later if you are on 19.0 before 19.0.3, or version 19.1.1 or later if you are on 19.1 before 19.1.1.

Compliance Impact

The vulnerability in GitLab EE allows an authenticated user with developer-role permissions to execute arbitrary client-side code in the context of another user's session due to improper sanitization of user-supplied input.

This type of vulnerability can lead to unauthorized access or manipulation of user data, which may impact the confidentiality and integrity of sensitive information.

Such security issues could potentially affect compliance with standards like GDPR and HIPAA, which require protection of personal and sensitive data against unauthorized access and breaches.

However, the provided information does not explicitly state the direct impact on compliance with these regulations.

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