Description
ILIAS before 9.24, 10.12, and 11.5 contains a PHP object injection vulnerability that allows authenticated users with Test creation or import permission to deserialize arbitrary objects via crafted Test archives. Attackers can inject a malicious tst_sequence sequence attribute that is passed to unserialize(), abusing Guzzle or Monolog gadget chains to write PHP files and execute code.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| ILIAS-eLearning e.V. | ILIAS | 9.0 – < 9.24, 10.0 – < 10.12, 11.0 – < 11.5 | 9.24 |
Advisories 1
- WID-SEC-2026-3954 ILIAS: Schwachstelle ermöglicht Codeausführung BSI CERT-Bund (WID) · Oct 14, 2026
References
- https://docu.ilias.de/go/blog/15821/952 vendor-advisory
- https://docu.ilias.de/ilias.php?baseClass=illmpresentationgui&obj_id=228077&ref_id=35 release-notes
- https://github.com/ILIAS-eLearning/ILIAS/commit/cf4e9c230edfd96fc94a1b1d355500aa8c6f1771 patch
- https://github.com/ILIAS-eLearning/ILIAS/commit/267d4645ea940f8f97d1a9838deff6a12097564d patch
- https://github.com/ILIAS-eLearning/ILIAS/commit/ac4684239641fb3dab2d636b53a61c46462d1208 patch
- https://github.com/ILIAS-eLearning/ILIAS/blob/2a3758ee3b01e5c66922e08f58a2189146b884d4/components/ILIAS/Test/classes/class.ilObjTest.php#L7364 technical-description
- https://github.com/ILIAS-eLearning/ILIAS/blob/2a3758ee3b01e5c66922e08f58a2189146b884d4/components/ILIAS/Test/classes/class.ilTestResultsImportParser.php#L225 technical-description
- https://github.com/ILIAS-eLearning/ILIAS product
- VulnCheck Advisory: ILIAS before 9.24, 10.12, and 11.5 PHP Object Injection via Test Results Import third-party-advisory