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CVE-2026-31862 siteboon CVE debrief

CVE-2026-31862 debrief based on the supplied source corpus. The CVE record was published on 2026-03-11T00:25:43.000Z and has not been modified since then. The vulnerability affects multiple Git-related API endpoints in @siteboon/claude-code-ui, allowing authenticated attackers to execute arbitrary OS commands via command injection. Defenders should assess exposure and prioritize updates to version 1.24.0 or later. The vulnerability is caused by the use of execAsync() with string interpolation of user-controlled parameters, such as file paths, branch names, commit messages, and commit hashes.

Vendor
siteboon
Product
@siteboon/claude-code-ui
CVSS
CRITICAL 9.1
CISA KEV
Not listed in stored evidence
Original CVE published
2026-03-11
Original CVE updated
2026-11-05
Advisory published
2026-03-11
Advisory updated
2026-11-05

Who should care

Defenders responsible for Git-related API endpoints and systems using @siteboon/claude-code-ui should assess exposure and prioritize updates to version 1.24.0 or later. This includes operators, platform administrators, vulnerability management teams, and security teams who need to verify exposure and implement remediation measures.

Why it matters

CVE-2026-31862 is a command injection vulnerability in @siteboon/claude-code-ui that allows authenticated attackers to execute arbitrary OS commands. Defenders should prioritize verifying exposure in Git-related API endpoints and updating to version 1.24.0 or later.

  • Authenticated attackers can execute arbitrary OS commands
  • Command injection vulnerability in multiple Git-related API endpoints
  • Potential for lateral movement and privilege escalation
  • Verification of exposure and remediation required

Technical summary

Multiple Git-related API endpoints in @siteboon/claude-code-ui use execAsync() with string interpolation of user-controlled parameters, allowing authenticated attackers to execute arbitrary OS commands. The vulnerable endpoints include GET /api/git/diff, GET /api/git/status, POST /api/git/commit, POST /api/git/checkout, POST /api/git/create-branch, GET /api/git/commits, and GET /api/git/commit-diff. The vulnerability can be exploited using various shell metacharacters, such as command substitution, command chaining, and newlines.

Defensive priority

Defenders should prioritize verifying exposure in Git-related API endpoints and updating to version 1.24.0 or later.

Recommended defensive actions

  • Verify exposure in Git-related API endpoints
  • Update to version 1.24.0 or later
  • Review and restrict user-controlled parameters
  • Implement additional security measures to prevent command injection
  • Review compensating controls for exposed systems while remediation is scheduled and verified
  • Check relevant monitoring, detection, and logs for exposed assets that need extra review
  • Track exceptions, retest remediated assets, and close the item only after evidence is documented

Evidence notes

The source corpus provides details on vulnerable endpoints and parameters, including GET /api/git/diff, GET /api/git/status, POST /api/git/commit, POST /api/git/checkout, POST /api/git/create-branch, GET /api/git/commits, and GET /api/git/commit-diff. However, version-specific exposure and remediation require verification. The CVE record was published on 2026-03-11T00:25:43.000Z and has not been modified since then.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-31862 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-31862

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

  • CVE-2026-31862 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-31862

    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.