CVE-2023-24426Network attack vector

Administrator access via preserved pre-login session

Published Jan 24, 2023 · Updated Apr 2, 2025

Session fixation in Jenkins Microsoft Entra ID Plugin 303.va_91ef20ee49f and earlier allows remote attackers to gain administrator access. The login callback preserves the pre-authentication HTTP session instead of invalidating it when the user identity is established. An attacker must socially engineer an administrator into authenticating with a fixed session, which can then be reused with the administrator privileges.

CVSS severity8.8
High
EPSS probability1.02%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Session fixation in Jenkins Microsoft Entra ID Plugin 303.va_91ef20ee49f and earlier allows remote attackers to gain administrator access. The login callback preserves the pre-authentication HTTP session instead of invalidating it when the user identity is established. An attacker must socially engineer an administrator into authenticating with a fixed session, which can then be reused with the administrator privileges.

The record

CVE
CVE-2023-24426
Published
Jan 24, 2023
Updated
Apr 2, 2025
Vendor
Jenkins Project
Product
Microsoft Entra ID (previously Azure AD) Plugin
Classifications
CWE-613, T1550.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jan 24, 2023CVE publishedPublication date reported by the CVE source.
  2. 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?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=unspecified <=303.va_91ef20ee49f

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Jenkins Project · Microsoft Entra ID (previously Azure AD) Pluginversion=unspecified <=303.va_91ef20ee49f

Published CVSS scores

8.8CISA-ADPCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
8.8NIST National Vulnerability DatabaseCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-613Insufficient Session Expiration
T1550.004Use Alternate Authentication Material: Web Session Cookie

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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