ILIAS-eLearning ILIAS up to 9.21/10.9/11.2 Shibboleth Logout shib_logout.php unserialize deserialization

Summaryinfo

A vulnerability classified as critical has been found in ILIAS-eLearning ILIAS up to 9.21/10.9/11.2. This impacts the function unserialize of the file components/ILIAS/AuthShibboleth/resources/shib_logout.php of the component Shibboleth Logout Handler. Performing a manipulation results in deserialization. This vulnerability is reported as CVE-2026-80428. The attack is possible to be carried out remotely. Moreover, an exploit is present. It is recommended to upgrade the affected component.

Detailsinfo

A vulnerability, which was classified as critical, was found in ILIAS-eLearning ILIAS up to 9.21/10.9/11.2. This affects the function unserialize of the file components/ILIAS/AuthShibboleth/resources/shib_logout.php of the component Shibboleth Logout Handler. The manipulation with an unknown input leads to a deserialization vulnerability. CWE is classifying the issue as CWE-502. The product deserializes untrusted data without sufficiently verifying that the resulting data will be valid. This is going to have an impact on confidentiality, integrity, and availability. The summary by CVE is:

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.

The advisory is shared at github.com. This vulnerability is uniquely identified as CVE-2026-80428 since 08/26/2026. The exploitability is told to be easy. It is possible to initiate the attack remotely. No form of authentication is needed for exploitation. Technical details and a public exploit are known.

The exploit is shared for download at exploit-db.com. It is declared as proof-of-concept. By approaching the search of inurl:components/ILIAS/AuthShibboleth/resources/shib_logout.php it is possible to find vulnerable targets with Google Hacking.

Upgrading to version 9.22, 10.10 or 11.3 eliminates this vulnerability.

The vulnerability is also documented in the databases at Exploit-DB (52682) and EUVD (EUVD-2026-66602). If you want to get the best quality for vulnerability data then you always have to consider VulDB.

Productinfo

Vendor

• ILIAS-eLearning

Name

• ILIAS

Version

• 9.0
• 9.1
• 9.2
• 9.3
• 9.4
• 9.5
• 9.6
• 9.7
• 9.8
• 9.9
• 9.10
• 9.11
• 9.12
• 9.13
• 9.14
• 9.15
• 9.16
• 9.17
• 9.18
• 9.19
• 9.20
• 9.21
• 10.0
• 10.1
• 10.2
• 10.3
• 10.4
• 10.5
• 10.6
• 10.7
• 10.8
• 10.9
• 11.0
• 11.1
• 11.2

License

• open-source

CPE 2.3info

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CPE 2.2info

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If you want to get the best quality for vulnerability data then you always have to consider VulDB.

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