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CRITICAL

CVE-2026-80428

CVSS v3

9.8

CRITICAL

EPSS Score

4.5 %

exploit probability, as of 2026-09-25

CISA KEV

No

known exploited

Exploitation

—

SSVC status

Description

ILIAS deserialises stored session data for an unauthenticated caller. The Shibboleth back-channel endpoint at components/ILIAS/AuthShibboleth/resources/shib_logout.php runs in a context that ilInitialisation exempts from authentication, and its logout-notification handler locates the session to terminate by reading every live row of the session table and passing each row's stored data to a hand-written parser that calls unserialize without restricting which classes may be constructed. Any serial

Technical details

Published
2026-08-26
Last Modified
2026-08-26
Exploit-DB
EDB-52682

Frequently asked questions

What is CVE-2026-80428?

ILIAS deserialises stored session data for an unauthenticated caller. The Shibboleth back-channel endpoint at components/ILIAS/AuthShibboleth/resources/shib_logout.php runs in a context that ilInitialisation exempts from authentication, and its logout-notification handler locates the session to terminate by reading every live row of the session table and passing each row's stored data to a hand-written parser that calls unserialize without restricting which classes may be constructed. Any serial

Is CVE-2026-80428 actively exploited?

Active exploitation of CVE-2026-80428 has not been confirmed. Its EPSS score was 4.5% on 2026-09-25, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2026-80428?

CVE-2026-80428 has a CVSS v3 base score of 9.8 (CRITICAL severity).

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