simplesamlphp simplesamlphp-module-casserver up to 7.0.2 SimpleSAMLphp deleteTicket path traversal

Summaryinfo

A vulnerability, which was classified as critical, was found in simplesamlphp simplesamlphp-module-casserver up to 7.0.2. This affects the function deleteTicket of the component SimpleSAMLphp Module. Such manipulation leads to path traversal. This vulnerability is traded as CVE-2026-46491. The attack may be launched remotely. There is no exploit available. You should upgrade the affected component.

Detailsinfo

A vulnerability, which was classified as critical, has been found in simplesamlphp simplesamlphp-module-casserver up to 7.0.2. Affected by this issue is the function deleteTicket of the component SimpleSAMLphp Module. The manipulation with an unknown input leads to a path traversal vulnerability. Using CWE to declare the problem leads to CWE-22. The product uses external input to construct a pathname that is intended to identify a file or directory that is located underneath a restricted parent directory, but the product does not properly neutralize special elements within the pathname that can cause the pathname to resolve to a location that is outside of the restricted directory. Impacted is confidentiality, integrity, and availability. CVE summarizes:

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.

The advisory is shared for download at github.com. This vulnerability is handled as CVE-2026-46491 since 05/14/2026. The exploitation is known to be easy. The attack may be launched remotely. No form of authentication is required for exploitation. There are known technical details, but no exploit is available. The MITRE ATT&CK project declares the attack technique as T1006.

Upgrading to version 7.0.3 eliminates this vulnerability. The upgrade is hosted for download at github.com. Applying the patch b84f3e4ed57c4d97e0dc73df102e7eff831a681f is able to eliminate this problem. The bugfix is ready for download at github.com. The best possible mitigation is suggested to be upgrading to the latest version.

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Productinfo

Vendor

• simplesamlphp

Name

• simplesamlphp-module-casserver

Version

• 7.0.0
• 7.0.1
• 7.0.2

License

• open-source

Website

• Product: https://github.com/simplesamlphp/simplesamlphp-module-casserver/

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