vulnerability / NVI-00002309 / Revision 5
SimpleSAMLphp casserver FileSystemTicketStore path traversal allows out-of-ticket-directory read/unserialize and conditional deletion
GitHub lists this reviewed advisory for simplesamlphp/simplesamlphp-module-casserver. Published version ranges and source prerequisites are shown below; this is not an inspection of a visitor’s application.
This report has not inspected your inventory, configuration, deployed build, reachability or evidence. A catalog listing and a severity score do not establish exposure or compromise.
01 / Meaning
Why it matters
Published affected context helps an owner decide what evidence to gather. This report has not examined your application.
8.6 high
GitHub source severity; exploitability and local consequence require separate evidence.
As of · GitHub Advisory Database
8.6 HIGH (3.1)
security-advisories@github.com severity; no combined Null risk score.
0.422%
FIRST EPSS model v2026.06.15; exploitation probability over 30 days, percentile 0.36561. Missing scores are unknown.
As of · FIRST EPSS
02 / Applicability
The affected context
Affected versions, configuration prerequisites and known exclusions are public. Confirm each one against the deployed service.
simplesamlphp/simplesamlphp-module-casserver
source listed<= 7.0.2
## Summary `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. ### Preconditions The demonstrated issue requires: - the `casserver` module to be enabled; - the file-based ticket store to be configured (`FileSystemTicketStore`); - public CAS validation/proxy endpoints to be reachable; - the PHP process to have filesystem permissions for the target path. - for the demonstrated CAS 1.0 deletion
simplesamlphp/simplesamlphp-module-casserver
source listedECOSYSTEM: introduced 0; fixed 7.0.3
## Summary `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. ### Preconditions The demonstrated issue requires: - the `casserver` module to be enabled; - the file-based ticket store to be configured (`FileSystemTicketStore`); - public CAS validation/proxy endpoints to be reachable; - the PHP process to have filesystem permissions for the target path. - for the demonstrated CAS 1.0 deletion
03 / Response
What to do next
- investigate
Identify the exact component and deployed version, examine the linked publisher’s conditions, and retain evidence of any mitigation.
Confirm current vendor support, compatibility and deployment evidence. This report has not tested a fix in your system. FIRST EPSS
- vendor patch
The original advisory lists fixed boundaries 7.0.3 for simplesamlphp/simplesamlphp-module-casserver. Confirm the publisher’s latest guidance.
Confirm current vendor support, compatibility and deployment evidence. This report has not tested a fix in your system. GitHub Advisory Database via OSV
A fixed release is not deployment evidence.
Check current vendor support and compatibility. After making a change, verify the deployed build and relevant runtime conditions. Keep the evidence, owner and time. An updated lockfile alone does not prove what is running.
04 / Limits
What this report cannot establish
- Customer inventory, deployment, reachability and exploitation have not been inspected.
- NVD lastModified does not establish freshness of every associated CPE record.
05 / Provenance
Sources you can inspect
Each assertion retains its source. Mirrored records may repeat one underlying publisher; additional links are not independent corroboration.
- GHSA-jrrg-99xh-5j2q ↗
GitHub Advisory Database · vendor advisory
Observed . GitHub Advisory Database; CC-BY-4.0. Each advisory links its original attribution. Null normalizes fields.
- GHSA-jrrg-99xh-5j2q ↗
GitHub Advisory Database via OSV · vendor advisory
Observed . GitHub-origin advisory, CC-BY-4.0; OSV is an aggregate copy, not independent corroboration.
- CVE-2026-46491 ↗
NIST National Vulnerability Database · official catalog
Observed . This product uses data from the NVD API but is not endorsed or certified by the NVD.
- CVE-2026-46491 ↗
FIRST EPSS · official catalog
Observed . FIRST EPSS; probability of exploitation in the next 30 days, not local compromise. Dataset date/model retained; FIRST services terms apply.
Public revision history
Only published revisions appear here. Routine fetches do not create a material-change event.
- Revision 5 ·
Dated EPSS estimate updated; this is not a new disclosure or proof of exploitation.
- Revision 4 ·
Source facts changed; compare the preserved prior revision.
- Revision 3 ·
Source facts changed; compare the preserved prior revision.
- Revision 2 ·
Dated EPSS estimate updated; this is not a new disclosure or proof of exploitation.
- Revision 1 ·
First indexed by Null; source disclosure date is shown separately.