CVE intelligence and bounded remediation

CVE-2025-11346 — A vulnerability has been found in ILIAS up to 8.23/9.13/10.1

Critical CVSS 9.8

A vulnerability has been found in ILIAS up to 8.23/9.13/10.1. This affects the function unserialize of the component Base64 Decoding Handler. Such manipulation of the argument f_settings leads to deserialization. It is possible to launch the attack remotely. Upgrading to version 8.24, 9.14 and 10.2 is able to mitigate this issue. It is advisable to upgrade the affected component.

Severity
Critical
CVSS
9.8 (3.1)
Published
2025-10-06
CISA KEV
Not currently listed
Ecosystem
software/application
Weaknesses
CWE-20, CWE-502

Affected products

  • ilias / ilias / 8.23
  • ilias / ilias / 9.13
  • ilias / ilias / 10.1

Matched remediation archetype

Unsafe deserialization and object reconstruction

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Check exposure

  • Inventory serialization formats accepted from requests, queues, caches, files, cookies, and cross-service messages.
  • Trace whether untrusted input can select classes, types, callbacks, constructors, or object hooks during decoding.
  • Identify signing, schema validation, trust-boundary, and compatibility settings for each decoder.

Remediate safely

  • Replace native object deserialization with a data-only format and explicit schema validation.
  • If replacement is not immediate, use a safe decoder with a minimal type allowlist and disable polymorphic or executable hooks.
  • Update the affected library and add inert tests for unknown types, extra fields, malformed nesting, and unsigned data.

Authoritative sources

Complete CVE record and remediation plan

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