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Server-Side Request Forgery (SSRF)Weakness · CWE-918

CVE-2026-13540

MEDIUM · 6.3 CVSS v3.1 Published 2026-06-29
Patch available
A vendor patch is available. No clean upgrade release — apply the published patch.
See remediation →
69/100
Remediation priority · Elevated
Remotely reachable Zero-click Patch available 7 weeks old

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
A security flaw has been discovered in GitBucket up to 4.46.1. This affects the function Git.cloneRepository.setURI of the file src/main/scala/gitbucket/core/service/RepositoryCreationService.scala. Performing a manipulation of the argument url results in server-side request forgery. The attack is possible to be carried out remotely. The exploit has been released to the public and may be used for attacks. The patch is named 487a9b980f56aa73b6a044b1e86a92eed5043215. To fix this issue, it is recommended to deploy a patch.

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
How this class of weakness works · CWE-918

The server can be induced to make requests to a URL an attacker controls, turning it into a proxy into internal networks and cloud metadata services. It's especially dangerous behind a trusted network boundary. The fix is strict allow-listing of destinations and blocking access to internal address ranges.

General guidance for the server-side request forgery (ssrf) class — the official description and references above are authoritative for this specific CVE. Want a bespoke review and a reviewed fix? Ask our team →

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
Low
User interaction
None
Scope
Unchanged
Confidentiality
Low
Integrity
Low
Availability
Low

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

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
Patch available Apply the vendor patch
Vendor patch github.com →
Recommended fix Moderate confidence

GitBucket 4.47.x (or latest stable release - check GitHub releases for the first version after 4.46.1)

  1. 1. Review the patch commit at https://github.com/gitbucket/gitbucket/commit/487a9b980f56aa73b6a044b1e86a92eed5043215 to understand the code changes made to src/main/scala/gitbucket/core/service/RepositoryCreationService.scala
  2. 2. Apply the code changes from the commit to your local GitBucket installation, specifically addressing the URL validation in the Git.cloneRepository.setURI function to prevent SSRF attacks
  3. 3. After applying the patch, rebuild GitBucket from source using your build system (typically sbt or maven)
  4. 4. Deploy the patched version to your production environment
  5. 5. Verify the fix by testing that the repository cloning functionality still works for valid URLs while rejecting potentially malicious internal network addresses
  6. 6. As a secondary measure, consider upgrading to the latest GitBucket release (currently 4.47.x or higher if available) once released, as it may include additional security fixes
Caveat Minor: Ensure any custom URL validation or repository creation integrations still function correctly after applying the patch

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

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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-2026-13540 in production — separate from our analysis above.

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