CVE-2026-5816

Received Received - Intake

Cross-Site Scripting in GitLab CE/EE Allows Arbitrary JS Execution

Publication date: 2026-04-22

Last updated on: 2026-04-23

Assigner: GitLab Inc.

Description

GitLab has remediated an issue in GitLab CE/EE affecting all versions from 18.10 before 18.10.4 and 18.11 before 18.11.1 that could have allowed an unauthenticated user to execute arbitrary JavaScript in a user's browser session due to improper path validation under certain conditions.

CVSS Scores

EPSS Scores

Probability:
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Meta Information

Published

2026-04-22

Last Modified

2026-04-23

Generated

2026-07-06

AI Q&A

2026-04-23

EPSS Evaluated

2026-07-05

NVD

CVE-2026-5816

EUVD

EUVD-2026-25046

Affected Vendors & Products

Vendor	Product	Version / Range
gitlab	gitlab	From 18.10.0 (inc) to 18.10.4 (exc)
gitlab	gitlab	From 18.10.0 (inc) to 18.10.4 (exc)
gitlab	gitlab	18.11.0
gitlab	gitlab	18.11.0

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-41	The product is vulnerable to file system contents disclosure through path equivalence. Path equivalence involves the use of special characters in file and directory names. The associated manipulations are intended to generate multiple names for the same object.

Attack-Flow Graph

Mitigation Strategies

To mitigate this vulnerability, you should upgrade GitLab CE/EE to versions 18.10.4 or later if you are using the 18.10 series, or to version 18.11.1 or later if you are using the 18.11 series.

Executive Summary

This vulnerability in GitLab CE/EE versions before 18.10.4 and 18.11.1 allows an unauthenticated user to execute arbitrary JavaScript in a user's browser session. This happens due to improper path validation under certain conditions.

Impact Analysis

The vulnerability can lead to arbitrary JavaScript execution in a user's browser session, which may result in compromised user data, session hijacking, or other malicious actions performed on behalf of the user.

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