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CVE-2026-2601 GitLab CVE debrief

GitLab has remediated an authorization bypass vulnerability in GitLab Enterprise Edition (EE) that could allow authenticated users with developer-role permissions to access sensitive deployment data on projects. The issue stems from improper authorization checks (CWE-862) and affects versions from 11.5 through 18.10.6, 18.11.0 through 18.11.3, and 19.0.0. GitLab released patches on May 27, 2026 in versions 18.10.7, 18.11.4, and 19.0.1. The vulnerability was reported through HackerOne and carries a CVSS 3.1 score of 4.3 (Medium severity). No known exploitation in ransomware campaigns has been documented.

Vendor
GitLab
Product
Unknown
CVSS
MEDIUM 4.3
CISA KEV
Not listed in stored evidence
Original CVE published
2026-05-27
Original CVE updated
2026-05-27
Advisory published
2026-05-27
Advisory updated
2026-05-27

Who should care

Organizations running self-managed GitLab EE instances with multi-user project environments where developer-role users should not have access to deployment configurations, secrets, or infrastructure details. Security teams responsible for CI/CD pipeline security and secrets management should prioritize patching.

Technical summary

CVE-2026-2601 is an improper authorization vulnerability (CWE-862) in GitLab EE affecting versions 11.5 through 18.10.6, 18.11.0 through 18.11.3, and 19.0.0. Authenticated users with developer-role permissions could bypass authorization checks to access sensitive deployment data on projects. The vulnerability is remotely exploitable with low attack complexity, requiring only low privileges and no user interaction. GitLab addressed this in security releases 18.10.7, 18.11.4, and 19.0.1 on May 27, 2026. The CVSS 3.1 score of 4.3 reflects limited confidentiality impact with no integrity or availability impact.

Defensive priority

medium

Recommended defensive actions

  • Upgrade GitLab EE to version 18.10.7, 18.11.4, 19.0.1, or later to remediate this authorization bypass vulnerability.
  • Review project deployment data access logs for unauthorized access by developer-role users between initial deployment of affected versions and patch application.
  • Verify role-based access controls for deployment-related features are properly enforced after patching.
  • Monitor for anomalous access patterns to deployment configurations and secrets in GitLab projects.

Evidence notes

Vulnerability description and affected version ranges derived from NVD CPE criteria and GitLab release notes. CVSS vector confirms network attack vector with low attack complexity, requiring low privileges and no user interaction. CWE-862 (Missing Authorization) identified as primary weakness. Timeline based on CVE published date of 2026-05-27T19:16:16.000Z.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-2601 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-2601

    CVE Program - Official CVE Program record with source-provided CVE metadata.

  • CVE-2026-2601 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-2601

    NIST National Vulnerability Database - Official NIST NVD detail page and source-specific vulnerability assessment.

Supplemental references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.