Deserialization in Ilias-Elearning E.v. Ilias
CVE-2026-110761
ILIAS before 9.24, 10.12, and 11.5 contains a PHP object injection vulnerability that allows authenticated users with Test creation or import permission to deserialize arbitrary objects via crafted Test archives. Attackers can inject a malicious tst_sequence sequence attribute that is passed to unserialize(), abusing Guzzle or Monolog gadget chains to write PHP files and execute code.
Vulnerability class: Insecure Deserialization
Published · last modified .
CVSS v3 metric
CVSS v3 base score 8.8 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.
EPSS exploit prediction
No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.
Affected products
Weakness classification (CWE)
References
- docu.ilias.de/go/blog/15821/952 (vendor-advisory)
- docu.ilias.de/ilias.php (release-notes)
- github.com/ILIAS-eLearning/ILIAS/commit/cf4e9c230edfd96fc94a1b1d355500aa8c6f1771 (patch)
- github.com/ILIAS-eLearning/ILIAS/commit/267d4645ea940f8f97d1a9838deff6a12097564d (patch)
- github.com/ILIAS-eLearning/ILIAS/commit/ac4684239641fb3dab2d636b53a61c46462d1208 (patch)
- github.com/ILIAS-eLearning/ILIAS/blob/2a3758ee3b01e5c66922e08f58a2189146b884d4/… (technical-description)
- github.com/ILIAS-eLearning/ILIAS/blob/2a3758ee3b01e5c66922e08f58a2189146b884d4/… (technical-description)
- github.com/ILIAS-eLearning/ILIAS (product)
- www.vulncheck.com/advisories/ilias-before-9.24-10.12-and-11.5-php-object-inject… (third-party-advisory)
Frequently asked questions
- What is CVE-2026-110761?
- CVE-2026-110761 is a high-severity vulnerability in Ilias-Elearning E.v. Ilias, classified under Deserialization of Untrusted Data. CVSS score: 8.8/10. Published 2026-10-14.
- How severe is CVE-2026-110761?
- High severity. CVSS v3 base score is 8.8 out of 10.