Account takeover via header-derived service URLs
Published Nov 1, 2022 · Updated Apr 23, 2025
Authentication bypass in Apereo phpCAS before 1.6.0 allows remote authenticated users to access victim accounts via a forged Host header. The client derives the ticket-validation service URL from attacker-controlled Host and forwarded-host headers instead of binding it to a configured base URL. Exploitation requires a valid ticket for an authorized service in the same CAS realm and a logged-in victim to visit an attacker-controlled site; the result is access to that victim's account.
Summary
What happened
Authentication bypass in Apereo phpCAS before 1.6.0 allows remote authenticated users to access victim accounts via a forged Host header. The client derives the ticket-validation service URL from attacker-controlled Host and forwarded-host headers instead of binding it to a configured base URL. Exploitation requires a valid ticket for an authorized service in the same CAS realm and a logged-in victim to visit an attacker-controlled site; the result is access to that victim's account.
The record
- CVE
- CVE-2022-39369
- Published
- Nov 1, 2022
- Updated
- Apr 23, 2025
- Vendor
- Apereo
- Product
- phpCAS
- Classifications
- CWE-1287, CWE-99, T1190
- Attack vector
- network
- Privileges
- authenticated
Timeline
How it unfolded
- Nov 1, 2022CVE publishedPublication date reported by the CVE source.
- Apr 23, 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=< 1.6.0
What conditions does exploitation require?
What is affected?
Published CVSS scores
CVSS describes severity. EPSS estimates exploitation probability.
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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