Authorization Bypass Through User-Controlled Key in GitLab

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Summary

CVECVE-2026-6976
StatePUBLISHED
AssignerGitLab
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-06-11 12:16:32 UTC
Updated2026-06-11 17:34:47 UTC
DescriptionGitLab 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.

Risk And Classification

Primary CVSS: v3.1 3.7 LOW from [email protected]

CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:U/C:L/I:L/A:N

Problem Types: CWE-639 | CWE-639 CWE-639: Authorization Bypass Through User-Controlled Key

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary3.7LOWCVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:U/C:L/I:L/A:N
3.1CNACVSS3.7LOWCVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:U/C:L/I:L/A:N

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
High
Privileges Required
Low
User Interaction
Required
Scope
Unchanged
Confidentiality
Low
Integrity
Low
Availability
None

CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:U/C:L/I:L/A:N

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Application Gitlab Gitlab All All All All
Application Gitlab Gitlab All All All All

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA GitLab GitLab affected 15.9 18.10.8 semver Not specified
CNA GitLab GitLab affected 18.11 18.11.5 semver Not specified
CNA GitLab GitLab affected 19.0 19.0.2 semver Not specified

References

ReferenceSourceLinkTags
about.gitlab.com/releases/2026/06/10/patch-release-gitlab-19-0-2-released [email protected] about.gitlab.com Release Notes
gitlab.com/gitlab-org/gitlab/-/work_items/598165 [email protected] gitlab.com Issue Tracking
hackerone.com/reports/3638136 [email protected] hackerone.com Permissions Required
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

Vendor Comments And Credit

Discovery Credit

CNA: Thanks [xorz](https://hackerone.com/xorz) for reporting this vulnerability through our HackerOne bug bounty program (en)

Additional Advisory Data

Solutions

CNA: Upgrade to versions 18.10.8, 18.11.5, 19.0.2 or above.

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