CVE-2023-24427Network attack vector

Administrator access via retained pre-login session

Published Jan 24, 2023 · Updated Apr 2, 2025

Session fixation in Jenkins Bitbucket OAuth Plugin 0.12 and earlier allows remote attackers to gain administrator access through social engineering. BitbucketSecurityRealm.doFinishLogin accepts the OAuth callback and authenticates the user without invalidating the preexisting HTTP session. An attacker must first fixate a session and persuade an administrator to complete Bitbucket login in that session, after which the attacker can reuse it with the administrator's Jenkins privileges.

CVSS severity8.8
High
EPSS probability1.06%
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 Bitbucket OAuth Plugin 0.12 and earlier allows remote attackers to gain administrator access through social engineering. BitbucketSecurityRealm.doFinishLogin accepts the OAuth callback and authenticates the user without invalidating the preexisting HTTP session. An attacker must first fixate a session and persuade an administrator to complete Bitbucket login in that session, after which the attacker can reuse it with the administrator's Jenkins privileges.

The record

CVE
CVE-2023-24427
Published
Jan 24, 2023
Updated
Apr 2, 2025
Vendor
Jenkins Project
Product
Bitbucket OAuth
Classifications
CWE-384, 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 <=0.12

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Jenkins Project · Bitbucket OAuthversion=unspecified <=0.12

Published CVSS scores

9.8CISA-ADPCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
9.8NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
8.8CloudBeesCVSS: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-384Session Fixation
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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