CVE-2026-46491
HighCVSS 8.6Exploitation Probability (EPSS)
Low risk35th percentile - higher than 35% of all known CVEs
Summary
SimpleSAMLphp-casserver before version 7.0.3 has a path traversal vulnerability in FileSystemTicketStore. An attacker can use ../ sequences in the ticket identifier to read and unserialize arbitrary files outside the ticket directory, and in CAS 1.0 also delete them.
Risk Assessment
A remote attacker can read sensitive server files (e.g., configuration) and potentially delete them, leading to data disclosure or service disruption.
Recommendation
Update SimpleSAMLphp-casserver to version 7.0.3 or later.
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Original NVD description (English source)
SimpleSAMLphp-casserver is a CAS 1.0 and 2.0 compliant CAS server in the form of a SimpleSAMLphp module. Prior to version 7.0.3, simplesamlphp-module-casserver builds file paths for the file-based CAS ticket store by directly concatenating the configured ticket directory with an attacker-controlled ticket identifier. Public CAS validation/proxy endpoints pass attacker-controlled ticket / pgt query parameters into this store. In deployments using FileSystemTicketStore, a remote attacker can use path traversal sequences such as ../target.serialized to make the CAS server read and unserialize files outside the ticket directory. In the CAS 1.0 validation flow, the same attacker-selected path is also passed to deleteTicket() immediately after getTicket() returns, which can delete the target file when it is readable by the PHP process, deletable under the PHP process filesystem permissions, and unserializes to a value compatible with the ?array return type. This issue has been patched in version 7.0.3.