CVE-2026-80428 ILIAS PHP Object Injection via Shibboleth Logout
Unauthenticated attackers can achieve remote code execution in ILIAS by injecting serialized objects via LTI and triggering deserialization through the Shibboleth logout endpoint.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-80428?
CVE-2026-80428 is a critical unsafe deserialization vulnerability in ILIAS-eLearning e.V. ILIAS, published on 26 Aug 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official 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.
Weakness: CWE-502
Which versions are affected by CVE-2026-80428?
How do I fix CVE-2026-80428?
No fix has been published for CVE-2026-80428 yet. Limit exposure of the affected software until one is available.
Upgrade, and only deserialise data from trusted sources or with an allow-list of types. More about Unsafe deserialization.
Is CVE-2026-80428 being exploited?
There is no known exploitation of CVE-2026-80428 in the wild and no public exploit code.
Public exploit code: 1 Exploit-DB entry and 3 proofs of concept on GitHub.
Sources
Also known as GHSA-6h76-35rh-gxm9.