CVE-2026-6976
Analyzed Analyzed - Analysis Complete

Authenticated User Merge Request Diff View Bypass in GitLab

Publication date: 2026-06-11

Last updated on: 2026-06-11

Assigner: GitLab Inc.

Description
GitLab has remediated an issue in GitLab CE/EE affecting all versions from 15.9 before 18.10.8, 18.11 before 18.11.5, and 19.0 before 19.0.2 that under certain conditions could have allowed an authenticated user with developer-role permissions to hide changes from merge request diff views due to improper input handling of file names.

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Meta Information

Published
2026-06-11
Last Modified
2026-06-11
Generated
2026-07-01
AI Q&A
2026-06-11
EPSS Evaluated
2026-06-30
NVD
CVE-2026-6976
EUVD
EUVD-2026-36228

Affected Vendors & Products

Showing 6 associated CPEs
Vendor Product Version / Range
gitlab gitlab From 15.9.0 (inc) to 18.10.8 (exc)
gitlab gitlab From 18.11.0 (inc) to 18.11.5 (exc)
gitlab gitlab From 19.0.0 (inc) to 19.0.2 (exc)
gitlab gitlab From 15.9.0 (inc) to 18.10.8 (exc)
gitlab gitlab From 18.11.0 (inc) to 18.11.5 (exc)
gitlab gitlab From 19.0.0 (inc) to 19.0.2 (exc)

Helpful Resources

Exploitability

CWE
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KEV
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CWE ID Description
CWE-639 The system's authorization functionality does not prevent one user from gaining access to another user's data or record by modifying the key value identifying the data.

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Executive Summary

This vulnerability in GitLab CE/EE affects versions from 15.9 before 18.10.8, 18.11 before 18.11.5, and 19.0 before 19.0.2. It allows an authenticated user with developer-role permissions to hide changes from merge request diff views. This happens due to improper input handling of file names under certain conditions.

Impact Analysis

The vulnerability could allow a developer-role user to conceal changes in merge requests by hiding them from the diff views. This may lead to incomplete code reviews and potentially allow malicious or unintended code changes to be merged without proper scrutiny.

Mitigation Strategies

To mitigate this vulnerability, you should upgrade GitLab CE/EE to a fixed version. Specifically, update to version 18.10.8 or later if you are using the 18.10 series, 18.11.5 or later if using the 18.11 series, or 19.0.2 or later if using the 19.0 series.

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