Administrator access via preserved login session
Published Jan 24, 2023 · Updated Apr 2, 2025
Session fixation in Jenkins Keycloak Authentication Plugin 2.3.0 and earlier allows remote attackers to gain administrator access. During Keycloak-backed login, the plugin preserves the existing Jenkins session instead of invalidating it and establishing a new session. Exploitation requires social engineering that causes an administrator to authenticate through a Jenkins session already known to the attacker.
Summary
What happened
Session fixation in Jenkins Keycloak Authentication Plugin 2.3.0 and earlier allows remote attackers to gain administrator access. During Keycloak-backed login, the plugin preserves the existing Jenkins session instead of invalidating it and establishing a new session. Exploitation requires social engineering that causes an administrator to authenticate through a Jenkins session already known to the attacker.
The record
- CVE
- CVE-2023-24456
- Published
- Jan 24, 2023
- Updated
- Apr 2, 2025
- Vendor
- Jenkins Project
- Product
- Keycloak Authentication Plugin
- Classifications
- CWE-384, T1539
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Jan 24, 2023CVE publishedPublication date reported by the CVE source.
- Apr 2, 2025Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
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- Affected versionversion=unspecified <=2.3.0
What conditions does exploitation require?
What is affected?
Published CVSS scores
CVSS describes severity. EPSS estimates exploitation probability.
Attacks
What attackers are doing with it
Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.
Public exploit references
No public exploit references are available in this record.
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Technologies
Your stack
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Your stack
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