How severe is CVE-2025-24399?

CVE-2025-24399 has a CVSS 3.x base score of 8.8, rated high severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2025-24399 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (41st percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2025-24399?

CVE-2025-24399 affects Jenkins Openid Connect Authentication. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2025-24399?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

Does CVE-2025-24399 have an EU (EUVD) identifier?

Yes. CVE-2025-24399 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-0186.

When was CVE-2025-24399 published?

CVE-2025-24399 was published on 2025-01-22 and last updated on 2026-06-17.

CVE-2025-24399

CVE-2025-24399 is a high-severity vulnerability in Jenkins Openid Connect Authentication with a CVSS 3.x base score of 8.8. 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-276.

Key facts

Severity: High (CVSS 3.x base score 8.8)
EPSS exploit prediction: 1% (41st percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2025-0186
Weakness: CWE-276
Affected product: Jenkins Openid Connect Authentication
Published: 2025-01-22
Last modified: 2026-06-17

Description

Jenkins OpenId Connect Authentication Plugin 4.452.v2849b_d3945fa_ and earlier, except 4.438.440.v3f5f201de5dc, treats usernames as case-insensitive, allowing attackers on Jenkins instances configured with a case-sensitive OpenID Connect provider to log in as any user by providing a username that differs only in letter case, potentially gaining administrator access to Jenkins.

Frequently asked questions

What is CVE-2025-24399?: Jenkins OpenId Connect Authentication Plugin 4.452.v2849b_d3945fa_ and earlier, except 4.438.440.v3f5f201de5dc, treats usernames as case-insensitive, allowing attackers on Jenkins instances configured with a case-sensitive OpenID Connect provider to log in as any user by providing a username that differs only in letter case, potentially gaining administrator access to Jenkins.
How severe is CVE-2025-24399?: CVE-2025-24399 has a CVSS 3.x base score of 8.8, rated high severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2025-24399 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (41st percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2025-24399?: CVE-2025-24399 affects Jenkins Openid Connect Authentication. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2025-24399?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
Does CVE-2025-24399 have an EU (EUVD) identifier?: Yes. CVE-2025-24399 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-0186.
When was CVE-2025-24399 published?: CVE-2025-24399 was published on 2025-01-22 and last updated on 2026-06-17.

References

https://www.jenkins.io/security/advisory/2025-01-22/#SECURITY-3461

Affected products (1)

cpe:2.3:a:jenkins:openid_connect_authentication:*:*:*:*:*:jenkins:*:*

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