Phishing via unrestricted post-login redirect
Published May 27, 2026 · Updated May 27, 2026
Open redirect in Jenkins Bitbucket OAuth Plugin 0.17 and earlier allows remote attackers to send users to attacker-controlled sites after login. BitbucketSecurityRealm.doCommenceLogin stores the unvalidated Referer header in the session, and doFinishLogin returns it directly through redirectTo after authentication. A victim must follow a crafted Jenkins login URL and complete Bitbucket authentication; the redirect supports phishing but does not itself expose Jenkins data.
Summary
What happened
Open redirect in Jenkins Bitbucket OAuth Plugin 0.17 and earlier allows remote attackers to send users to attacker-controlled sites after login. BitbucketSecurityRealm.doCommenceLogin stores the unvalidated Referer header in the session, and doFinishLogin returns it directly through redirectTo after authentication. A victim must follow a crafted Jenkins login URL and complete Bitbucket authentication; the redirect supports phishing but does not itself expose Jenkins data.
The record
- CVE
- CVE-2026-48924
- Published
- May 27, 2026
- Updated
- May 27, 2026
- Vendor
- Jenkins Project
- Product
- Bitbucket OAuth Plugin
- Classifications
- CWE-601, T1566.002
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- May 27, 2026CVE publishedPublication date reported by the CVE source.
- May 27, 2026Record 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=0 <=0.17
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What is affected?
Published CVSS scores
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Attacks
What attackers are doing with it
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Weakness, pattern, technique
Public exploit references
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Technologies
Your stack
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Your stack
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