Open redirect via backslash-normalized logout target
Published Aug 29, 2026 · Updated Aug 29, 2026
Open redirect in pac4j-core before 6.5.6 allows remote attackers to send users to external sites through crafted logout links. DefaultLogoutLogic.perform() accepts a URL request parameter when it matches logoutUrlPattern but does not reject backslashes, which browsers normalize into a network-path reference. Exploitation requires user interaction and a logout target that satisfies the configured pattern; the reported consequence is redirection to an attacker-controlled site.
Summary
What happened
Open redirect in pac4j-core before 6.5.6 allows remote attackers to send users to external sites through crafted logout links. DefaultLogoutLogic.perform() accepts a URL request parameter when it matches logoutUrlPattern but does not reject backslashes, which browsers normalize into a network-path reference. Exploitation requires user interaction and a logout target that satisfies the configured pattern; the reported consequence is redirection to an attacker-controlled site.
The record
- CVE
- CVE-2026-82464
- Published
- Aug 29, 2026
- Updated
- Aug 29, 2026
- Vendor
- pac4j
- Product
- pac4j
- Classifications
- CWE-601
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Aug 29, 2026CVE publishedPublication date reported by the CVE source.
- Aug 29, 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 <6.5.6
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What is affected?
Published CVSS scores
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Attacks
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Technologies
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