CVE-2026-80428: ILIAS PHP Object Injection via Shibboleth Logout

Severity: critical (CVSS 9.8 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 4.7% probability of exploitation in the next 30 days
Public exploit or detection template: yes
Published: 2026-08-26 · updated 2026-09-30
Weakness: CWE-502

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.

Affected products

ILIAS-eLearning e.V. ILIAS: from 9.0 before 9.22; from 10.0 before 10.10; from 11.0 before 11.3 — fixed in 10.10, 11.3, 9.22

How to fix

Upgrade to a fixed version: ILIAS-eLearning e.V. ILIAS 10.10, 11.3, 9.22. Check the vendor advisory for mitigations.

In the news

[remote] CVE-2026-80428 Unauthenticated PHP Object Injection via Shibboleth - ILIAS < 9.22, 10.0 < 10.10, 11.0 < 11.3 - RCE

References

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