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GitLabApplication

CVE-2026-5262

MEDIUM · 6.1 CVSS v3.1 Published 2026-04-22
Fix available
A fix is available. Upgrade to 18.9.6 / 18.10.4 or later.
See remediation →
68/100
Remediation priority · Elevated
Remotely reachable No privileges

Official description Straight from the sourceThe vendor's or NVD's own wording, published unedited. Authoritative, but often terse — it says what broke, rarely what to do.

NVD · unedited
GitLab has remediated an issue in GitLab CE/EE affecting all versions from 16.1.0 before 18.9.6, 18.10 before 18.10.4, and 18.11 before 18.11.1 that under certain conditions could have allowed an unauthenticated user to access tokens in the Storybook development environment due to improper input validation.

Technical summary Written by usOur analysis, written from the advisory, the CVSS vector and the affected-version data. It adds context the advisory leaves out, and never invents facts that are not in the source.

dbcve analysis · moderate confidence

GitLab CE/EE versions prior to 18.9.6, 18.10.4, and 18.11.1 had improper input validation in the Storybook development environment that could allow unauthenticated users to access sensitive tokens.

MitigationUpgrade GitLab to version 18.9.6, 18.10.4, 18.11.1 or later. If immediate upgrade is not feasible, consider restricting network access to Storybook development endpoints or disabling Storybook in production environments.

Verify against the referenced sources before acting — the references below are authoritative for this CVE, this summary is not.

Affected products & versions What the vendor confirmedThe version ranges the vendor confirmed as vulnerable. If your version sits inside a range here, treat yourself as exposed until you have upgraded.

NVD · CPE data
GitLabApplication
Affected:>= 16.1.0, < 18.9.6>= 18.10.0, < 18.10.4= 18.11.0

CVSS breakdown How the score is builtThe industry scoring standard. It rates how the flaw is reached, what it takes to exploit, and what an attacker gains — the score is derived from those, not the other way round.

From the vector
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
Required
Scope
Changed
Confidentiality
Low
Integrity
Low
Availability
None

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

Am I affected? How to checkSteps we derive from the advisory and the affected-version data, so you can decide whether this CVE reaches your setup. They are a guide, not a scan — your own configuration is the authority.

dbcve checks

Work through these to decide whether this CVE applies to you.

  1. Determine installed GitLab version
    Run `gitlab-rake gitlab:env:info` or `cat /opt/gitlab/version` to retrieve the exact GitLab version installed in your environment
    Affected if The version falls within any of these ranges: 16.1.0 to 18.9.5, 18.10.0 to 18.10.3, or exactly 18.11.0
  2. Confirm Storybook development environment is active
    Check if the Storybook development server is running or accessible on your GitLab instance. Storybook is typically exposed on a development port during the development workflow.
    Affected if Storybook is running and network-accessible (even on localhost) while the GitLab version is in the affected ranges listed above
  3. Verify unauthenticated access to Storybook endpoints
    Attempt to access Storybook endpoints without authentication. If the Storybook dev server responds and exposes any UI or assets without requiring login, the environment is vulnerable.
    Affected if Storybook responds to unauthenticated requests and the installed GitLab version is in the affected ranges

You are affected if your GitLab version is 16.1.0 through 18.9.5, 18.10.0 through 18.10.3, or exactly 18.11.0 AND the Storybook development environment is running and accessible.

Generated from the published advisory. Verify against your own configuration.

Check your environment

Paste your version and any relevant configuration and it will be compared against the affected criteria above. Do not include secrets or credentials.

AI-assisted, checked against the advisory. Informational, not a guarantee.

Remediation Closing itWhat it takes to close this. Where a vendor fix exists we point at it; where none exists we say so plainly, and can build one. Effort estimates are scoped from the advisory, not from your codebase.

dbcve · scoped
Upgrade available Upgrade to 18.9.6 / 18.10.4 or later
Fixed in 18.9.618.10.4
Interim mitigation

Upgrade GitLab to version 18.9.6, 18.10.4, 18.11.1 or later. If immediate upgrade is not feasible, consider restricting network access to Storybook development endpoints or disabling Storybook in production environments.

Recommended fix High confidence

18.9.6, 18.10.4, or 18.11.1 (depending on your current version branch)

  1. Identify your current GitLab version using the GitLab admin interface or `gitlab-rake gitlab:env:info`
  2. Determine which upgrade path applies to your current version based on affected ranges: 16.1.0 to 18.9.5 → upgrade to 18.9.6; 18.10.0 to 18.10.3 → upgrade to 18.10.4; 18.11.0 → upgrade to 18.11.1
  3. Review the GitLab upgrade documentation for your current version to target version
  4. Create a full backup of your GitLab instance before upgrading
  5. Stop GitLab services using `sudo gitlab-ctl stop`
  6. Update GitLab using your package manager (e.g., `sudo apt-get update && sudo apt-get install gitlab-ce` or `sudo yum install gitlab-ce`)
  7. Reconfigure GitLab with `sudo gitlab-ctl reconfigure`
  8. Restart GitLab services with `sudo gitlab-ctl restart`
Caveat Standard GitLab minor version upgrades typically have minimal breaking changes; review GitLab release notes for any deprecation notices

Generated from the published advisory — verify against the referenced sources before acting.

Fix this in GitLab Scoped from the published advisory
  • Consultation1.0 h
  • Implementation2.0 h
  • Testing2.0 h
  • Review / QA1.0 h
6.0 hours of engineering $1,040
Get the upgrade done

An estimate, not a bill — we confirm scope with you before any work starts. Need it this week? Rush from $1,664.

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References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.

Primary sources

Practitioner notes

Contributed

Peer-ranked notes from engineers who’ve handled CVE-2026-5262 in production — separate from our analysis above.

No notes yet

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What this is

A place for practitioners to share what actually worked: a mitigation you’ve tested, a configuration change, a version- or environment-specific caveat, or a link to a verified patch. The most useful notes rise to the top as peers upvote them, so the signal stays high.

What belongs here
  • Verified mitigations, workarounds, and config changes
  • Version or environment caveats, and links to real fixes
  • No weaponised exploit code, or anything meant to cause harm
  • No spam, self-promotion, credentials, or personal data