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GitLabApplication

CVE-2019-18454

MEDIUM · 6.1 CVSS v3.1 Published 2019-11-26
Fix available
A fix is available. Upgrade to after 12.4.0 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
An issue was discovered in GitLab Community and Enterprise Edition 10.5 through 12.4 in link validation for RDoc wiki pages feature. It has XSS.

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 · high confidence

Cross-site scripting (XSS) vulnerability in GitLab's link validation for RDoc wiki pages. An attacker can inject malicious scripts through links embedded in RDoc-formatted wiki pages, which execute when other users view the content. Affects GitLab Community and Enterprise Edition versions 10.5 through 12.4.

MitigationUpgrade GitLab to version 12.4.1 or later. If immediate upgrade is not possible, disable the RDoc wiki pages feature or implement input sanitization for wiki link validation as a temporary mitigation.

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:>= 10.5.0, <= 12.4.0

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. Check GitLab version
    Run `gitlab-rake gitlab:env:info` or check `/opt/gitlab/version` ( Omnibus install) or `git --version` for source install. In the Admin area, go to /admin/about for version info.
    Affected if The installed version is >= 10.5.0 and <= 12.4.0
  2. Verify RDoc wiki feature is in use
    Navigate to any project wiki in the GitLab instance. Check if wiki pages exist and if they use RDoc formatting. Go to Project > Wiki > New Page and observe if RDoc is an available format option.
    Affected if RDoc-formatted wiki pages exist or can be created in the GitLab instance
  3. Confirm wiki is enabled for projects
    Check if wikis are enabled at the instance level by going to Admin Area > Settings > General > Visibility and access controls, or inspect project settings to confirm the wiki feature toggle is enabled.
    Affected if Wiki functionality is enabled for any project on the GitLab instance

You are affected if your GitLab version falls between 10.5.0 and 12.4.0 inclusive AND the wiki feature is enabled and RDoc-formatted wiki pages can be viewed or created.

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.

From vendor data
Upgrade available Upgrade to a release after 12.4.0
Interim mitigation

Upgrade GitLab to version 12.4.1 or later. If immediate upgrade is not possible, disable the RDoc wiki pages feature or implement input sanitization for wiki link validation as a temporary mitigation.

Fix this in GitLab Scoped from the published advisory
  • Consultation2.0 h
  • Implementation4.0 h
  • Testing3.0 h
  • Review / QA2.0 h
11.0 hours of engineering $1,930
Get the upgrade done

An estimate, not a bill — we confirm scope with you before any work starts. Need it this week? Rush from $3,088.

Scan for this in your stack

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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-2019-18454 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