Improper Access Control in plantuml/plantuml

published 2023-06-27 3 y ago modified 2026-06-17 4 mo ago also GHSA-p2mf-q26j-3xmh , EUVD-2023-1850

cvss: 5.3; version 3.0, CNA
cisa kev: Not listed; not in CISA's catalog
epss: 0.9%; EPSS 0.9% chance of exploitation in 30 days, percentile 58%
public exploits: 0; none known

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

Patch / fix

fixed in 2 links 2

maven net.sourceforge.plantuml:plantuml-mit 1.2023.9
plantuml plantuml/plantuml 1.2023.9

github.com/plantuml/plantuml@fbe7fa3 commit
huntr.dev/bounties/fa741f95-b53c-4ed7-b157-e32c5145164c advisory

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2023-3431 updated 2025-11-21 cvss 5.3

plantuml: Local file read through %load_json in plantuml/plantuml

Red Hat All currently supported Red Hat products
not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

Exploit prediction

0.87% chance of exploitation in the next 30 days, higher than 58% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

huntr.dev https://huntr.dev/bounties/fa741f95-b53c-4ed7-b157-e32c5145164c referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by	version	score	vector
CNA	3.0	5.3	CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
NVD	3.1	5.3	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
GitHub	3.0	5.3	CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

Affected packages

ecosystem	package	affected	fixed in
maven	net.sourceforge.plantuml:plantuml-mit	<1.2023.9	1.2023.9

Affected products

plantuml plantuml/plantuml

Classification

Weakness

CWE-284 Improper Access Control

References

github.com /plantuml/plantuml/commit/fbe7fa3b25b4c887d83927cffb1009ec6cb8ab1e
web, patch
huntr.dev /bounties/fa741f95-b53c-4ed7-b157-e32c5145164c
web, exploit, patch, third-party-advisory
lists.fedoraproject.org /archives/list/package-announce@lists.fedoraproject.org/message/FV7XL3CY3K3K5ER3ASMEQA546MIQQ7QM/
mailing-list, third-party-advisory
nvd.nist.gov /vuln/detail/CVE-2023-3431
advisory
github.com /plantuml/plantuml
package
lists.fedoraproject.org /archives/list/package-announce@lists.fedoraproject.org/message/FV7XL3CY3K3K5ER3ASMEQA546MIQQ7QM
web

Sources

CVE List CVE-2023-3431
GitHub Advisory GHSA-p2mf-q26j-3xmh
NVD CVE-2023-3431

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

Summary