Unauthenticated user redirection via unvalidated logout return URL
Published May 10, 2025 · Updated May 12, 2025
Open redirect in Catalyst User Key Authentication Plugin 20220819 allows remote attackers to redirect users through a crafted logout URL. In auth.php, user_logout_userkey() accepts the return parameter as PARAM_URL and passes it unchanged to Moodle's redirect() routine. No login is required, but a target must follow the crafted link; the resulting redirect can send the browser to any attacker-chosen website.
Summary
What happened
Open redirect in Catalyst User Key Authentication Plugin 20220819 allows remote attackers to redirect users through a crafted logout URL. In auth.php, user_logout_userkey() accepts the return parameter as PARAM_URL and passes it unchanged to Moodle's redirect() routine. No login is required, but a target must follow the crafted link; the resulting redirect can send the browser to any attacker-chosen website.
The record
- CVE
- CVE-2025-4513
- Published
- May 10, 2025
- Updated
- May 12, 2025
- Vendor
- Catalyst
- Product
- User Key Authentication Plugin
- Classifications
- CWE-601, T1204.001
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- May 10, 2025CVE publishedPublication date reported by the CVE source.
- May 12, 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=20220819
What conditions does exploitation require?
What is affected?
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.
Weakness, pattern, technique
Public exploit references
- key_user_authentication_open_redirectionproof of concept · demonstrated
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Technologies
Your stack
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Your stack
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