How severe is CVE-2023-24456?

CVE-2023-24456 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2023-24456 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (65th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2023-24456?

CVE-2023-24456 affects Jenkins Keycloak Authentication. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2023-24456?

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

When was CVE-2023-24456 published?

CVE-2023-24456 was published on 2023-01-26 and last updated on 2026-06-17.

CVE-2023-24456

CVE-2023-24456 is a critical-severity vulnerability in Jenkins Keycloak Authentication with a CVSS 3.x base score of 9.8. 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-384.

Key facts

Severity: Critical (CVSS 3.x base score 9.8)
EPSS exploit prediction: 1% (65th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-384
Affected product: Jenkins Keycloak Authentication
Published: 2023-01-26
Last modified: 2026-06-17

Description

Jenkins Keycloak Authentication Plugin 2.3.0 and earlier does not invalidate the previous session on login.

Frequently asked questions

What is CVE-2023-24456?: Jenkins Keycloak Authentication Plugin 2.3.0 and earlier does not invalidate the previous session on login.
How severe is CVE-2023-24456?: CVE-2023-24456 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2023-24456 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (65th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2023-24456?: CVE-2023-24456 affects Jenkins Keycloak Authentication. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2023-24456?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
When was CVE-2023-24456 published?: CVE-2023-24456 was published on 2023-01-26 and last updated on 2026-06-17.

References

https://www.jenkins.io/security/advisory/2023-01-24/#SECURITY-2987

Affected products (1)

cpe:2.3:a:jenkins:keycloak_authentication:*:*:*:*:*:jenkins:*:*

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