CVE-2023-3431 — Improper Access Control in GitHub repository plantuml/plantuml prior to 1

Improper Access Control in GitHub repository plantuml/plantuml prior to 1.2023.9.

01What is this vulnerability?

Improper Access Control in GitHub repository plantuml/plantuml prior to 1.2023.9.

02Affected products

Vendor	Product	Versions
plantuml	plantuml/plantuml	unspecified

03Active exploitation status

Not currently listed on the CISA Known Exploited Vulnerabilities (KEV) catalog. EPSS is the best forward-looking signal — see the EPSS row above.

04Recommended remediation

• Patch to a fixed version listed in the vendor advisory (see references below).
• Mitigate with WAF rules, network egress filters, or feature flags where the patch is not yet available.
• Hunt historical logs for exploitation indicators — see Detection signatures below.

05Technical details

For the full vendor write-up, exploit chains, and reference implementations, see the references list in section 09.

06Detection signatures

Open the Sigma generator with a pre-filled prompt for this CVE to draft a starting detection in your stack of choice:

Open in Sigma generator →

07Related CVEs

No directly-cited follow-up CVEs in the KB record for this advisory. The references list in section 09 carries the vendor cross-references.

08Timeline

• Published: 2023-06-27T14:28:33.739Z
• Last modified: 2025-02-13T16:55:25.947Z

09References

• huntr.dev — https://huntr.dev/bounties/fa741f95-b53c-4ed7-b157-e32c5145164c
• github.com — https://github.com/plantuml/plantuml/commit/fbe7fa3b25b4c887d83927cffb1009ec6cb8…
• lists.fedoraproject.org — https://lists.fedoraproject.org/archives/list/[email protected]…