How severe is CVE-2023-3431?

CVE-2023-3431 has a CVSS 3.x base score of 5.3, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is low, integrity none, and availability none.

Is CVE-2023-3431 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (54th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2023-3431?

CVE-2023-3431 primarily affects Plantuml. In total, 2 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2023-3431?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

When was CVE-2023-3431 published?

CVE-2023-3431 was published on 2023-06-27 and last updated on 2026-06-17.

CVE-2023-3431

CVE-2023-3431 is a medium-severity vulnerability in Plantuml with a CVSS 3.x base score of 5.3. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-284.

Key facts

Severity: Medium (CVSS 3.x base score 5.3)
EPSS exploit prediction: 1% (54th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-284
Affected product: Plantuml
Published: 2023-06-27
Last modified: 2026-06-17

Description

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

Frequently asked questions

What is CVE-2023-3431?: Improper Access Control in GitHub repository plantuml/plantuml prior to 1.2023.9.
How severe is CVE-2023-3431?: CVE-2023-3431 has a CVSS 3.x base score of 5.3, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is low, integrity none, and availability none.
Is CVE-2023-3431 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (54th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2023-3431?: CVE-2023-3431 primarily affects Plantuml. In total, 2 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2023-3431?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2023-3431 published?: CVE-2023-3431 was published on 2023-06-27 and last updated on 2026-06-17.

References

Affected products (2)

cpe:2.3:a:plantuml:plantuml:*:*:*:*:*:*:*:*
cpe:2.3:o:fedoraproject:fedora:39:*:*:*:*:*:*:*

More vulnerabilities in Plantuml

CVE-2023-3432 — Critical (CVSS 10.0): Server-Side Request Forgery (SSRF) in GitHub repository plantuml/plantuml prior to 1.2023.9.
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