Description
ILIAS before versions 9.22, 10.10, and 11.3 contains an unauthenticated PHP object injection vulnerability that allows unauthenticated attackers to execute arbitrary code by injecting serialized objects through the LTI authentication endpoint and triggering deserialization via the Shibboleth back-channel logout endpoint. Attackers can write arbitrary serialized objects into session storage, then exploit an available POP gadget through the logout endpoint's unrestricted deserialization to write attacker-controlled PHP content to a web-accessible path and achieve remote code execution as the web server user.
References8
- docu.ilias.de/ilias.php?baseClass=illmpresentationgui&obj_id=22…
- docu.ilias.de/ilias.php?baseClass=illmpresentationgui&obj_id=22…
- docu.ilias.de/ilias.php?baseClass=illmpresentationgui&obj_id=22…
- docu.ilias.de/ilias.php?baseClass=ilrepositorygui&cmdNode=wy:ll…
- docu.ilias.de/ilias.php?baseClass=ilrepositorygui&cmdNode=wy:ll…
- docu.ilias.de/ilias.php?baseClass=ilrepositorygui&cmdNode=wy:ll…
- schweigertit.de/en/advisories/SIT-2026-002.html
- schweigertit.de/en/writeups/php-object-injection-shibboleth-log…
Metrics
- CVSS 3.1
-
9.8
CRITICAL
Score source: CNA
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H - CVSS 4.0
-
9.3
CRITICAL
Score source: CNA
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X - EPSS — exploit probability
- 5% percentile: 92 · as of 9 November 2026
- CWE
- CWE-502
Could this be exploited in your environment?
A patch closes the known hole. A penetration test shows what an attacker can still reach — with proof.