CVE-2023-3432: Server-Side Request Forgery (SSRF) in GitHub repository plantuml/plantuml prior to 1.2023.9.

Q: How do I fix CVE-2023-3432?

plantuml: upgrade to 1.2023.9; fedora: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.

Q: Is CVE-2023-3432 being exploited?

CVE-2023-3432 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2023-3432 affect?

CVE-2023-3432 affects plantuml, fedora. Severity is critical (CVSS 10.0). Server-Side Request Forgery (SSRF) in GitHub repository plantuml/plantuml prior to 1.2023.9.

Q: How urgent is CVE-2023-3432?

Priority 60/100. Critical severity; Public exploit reference; Remotely exploitable, no login, no user action

This week

CRITICAL 10.0REMOTEUPGRADEMITIGATE

CVE-2023-3432 is a critical-severity flaw (CVSS 10.0) affecting plantuml, fedora. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Server-Side Request Forgery (SSRF) in GitHub repository plantuml/plantuml prior to 1.2023.9.

Why this priority

Critical severity
Public exploit reference
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	10.0 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.9% (top 41%)
CISA exploited list	No
Weakness	CWE-918
Published	2023-06-27
Last modified	2026-06-17

Publisher (CNA): huntr.dev · Vendor: fedoraproject · plantuml

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2023-06-27 15:15 UTCPublished CVE record published
2026-06-17 06:14 UTCUpdated Record last modified

plantuml plantuml UPGRADE

Affected: < 1.2023.9

Fixed in: 1.2023.9

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy plantuml || rpm -q plantuml || plantuml --version

2. UPGRADE to 1.2023.9 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade plantuml

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade plantuml

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

fedoraproject fedora MITIGATE

Affected: 39

Fixed in: no fixed release known

Safe to downgrade to: a release before 39

Check your OS release

cat /etc/os-release; uname -r

Debian / Ubuntu

sudo apt update && sudo apt full-upgrade

RHEL / Amazon Linux / Fedora

sudo dnf upgrade --refresh

Windows

Install the latest cumulative update from Windows Update

If no patch exists yet

OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2023-3432?

plantuml: upgrade to 1.2023.9; fedora: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2023-3432 being exploited?

CVE-2023-3432 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2023-3432 affect?

CVE-2023-3432 affects plantuml, fedora. Severity is critical (CVSS 10.0). Server-Side Request Forgery (SSRF) in GitHub repository plantuml/plantuml prior to 1.2023.9.

How urgent is CVE-2023-3432?

Priority 60/100. Critical severity; Public exploit reference; Remotely exploitable, no login, no user action

Software pages

GitHub vulnerabilities

Related CVEs

CVE-2026-0858 MEDIUM 6.1 UPGRADE Versions of the package net.sourceforge.plantuml:plantuml before 1.2026.0 are vulnerable to Stored XSS due to
CVE-2023-3431 MEDIUM 5.3 UPGRADE MITIGATE Improper Access Control in GitHub repository plantuml/plantuml prior to 1.2023.9.
CVE-2022-1379 CRITICAL 9.1 UPGRADE MITIGATE URL Restriction Bypass in GitHub repository plantuml/plantuml prior to V1.2022.5
CVE-2022-1231 MEDIUM 6.1 UPGRADE MITIGATE XSS via Embedded SVG in SVG Diagram Format in GitHub repository plantuml/plantuml prior to 1.2022.4
CVE-2020-36523 LOW 3.5 DOWNGRADE A vulnerability was found in PlantUML 6.43

References

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