CVE-2026-80428: Ilias-Elearning E.v Ilias

Critical severity, CVSS 9.8. EPSS: 4.7% chance of exploitation in the next 30 days.

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.

Affected products

• Ilias-Elearning E.v Ilias: from 9.0, before 9.22 (fixed in 9.22); from 10.0, before 10.10 (fixed in 10.10); from 11.0, before 11.3 (fixed in 11.3)

Published 2026-08-26. Last modified 2026-09-30.