Cross-Site Scripting in GitLab CE/EE

Publication date: 2026-07-08

Last updated on: 2026-07-08

Assigner: GitLab Inc.

Description

GitLab has remediated an issue in GitLab CE/EE affecting all versions from 15.7 before 18.11.7, 19.0 before 19.0.4, and 19.1 before 19.1.2 that under certain conditions could have allowed an authenticated user to execute arbitrary scripts in another user's browser session due to improper sanitization of user-supplied input.

CVSS Scores

EPSS Scores

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Meta Information

Published

2026-07-08

Last Modified

2026-07-08

Generated

2026-07-09

AI Q&A

2026-07-09

EPSS Evaluated

N/A

NVD

CVE-2026-13320

Affected Vendors & Products

Vendor	Product	Version / Range
gitlab	gitlab_ce	From 15.7 (inc) to 18.11.7 (exc)
gitlab	gitlab_ee	From 15.7 (inc) to 18.11.7 (exc)
gitlab	gitlab_ce	From 19.0 (inc) to 19.0.4 (exc)
gitlab	gitlab_ee	From 19.0 (inc) to 19.0.4 (exc)
gitlab	gitlab_ce	From 19.1 (inc) to 19.1.2 (exc)
gitlab	gitlab_ee	From 19.1 (inc) to 19.1.2 (exc)

Helpful Resources

Exploitability

CWE

KEV

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.

Attack-Flow Graph

Executive Summary

This vulnerability in GitLab CE/EE affects versions from 15.7 before 18.11.7, 19.0 before 19.0.4, and 19.1 before 19.1.2. Under certain conditions, it could allow an authenticated user to execute arbitrary scripts in another user's browser session. This happens due to improper sanitization of user-supplied input, which means that malicious code can be injected and run in the context of another user's session.

Impact Analysis

The impact of this vulnerability is that an attacker who is authenticated could execute arbitrary scripts in another user's browser session. This can lead to serious consequences such as theft of sensitive information, session hijacking, or performing actions on behalf of the victim user without their consent.

Mitigation Strategies

To mitigate this vulnerability, you should upgrade GitLab CE/EE to a fixed version. Specifically, update to GitLab CE/EE version 18.11.7 or later, 19.0.4 or later, or 19.1.2 or later, depending on your current version.

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