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CVE-2026-18745 – Unauthenticated Remote Code Execution via PHP Object Injection – ILIAS 9.0–9.21, 10

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Summary

CVE-2026-18745 was reserved on 2026-08-03 and published on 2026-09-04, but it was rejected/withdrawn by its CVE Numbering Authority (VulnCheck) on the same day it was published (2026-09-04). The official CVE record contains no vulnerability description, no CVSS score, no affected product/version data, and no references — only a rejection notice.

Technical details

  • No technical details are available: the authoritative CVE record (CVE List V5) contains only cveMetadata and a rejectedReasons block.
  • The rejection reason given is the standard boilerplate: "This CVE ID has been rejected or withdrawn by its CVE Numbering Authority."
  • No CNA container with a description, CWE, affected products, or CVSS metrics was ever published for this ID.
  • Third-party aggregator sites describe this ID as an "ILIAS unauthenticated PHP object injection / deserialization" issue, but this description does not appear in any authoritative source (MITRE CVE List, NVD, or an ILIAS vendor advisory) and cannot be verified.

Affected software

  • None confirmed. No affected product or version range is published in the authoritative record for this CVE ID.

Severity

  • No CVSS score or vector is published in the authoritative CVE record for this ID. (A CVSS 9.3 score was supplied as prior context but could not be verified against any primary source and is not reproduced here.)

Mitigation and recommended actions

  • No patch or mitigation guidance can be issued against this specific CVE ID, since it carries no verified vulnerability description.
  • Security teams tracking ILIAS deployments should monitor official ILIAS security advisories and the CVE record directly for a possible re-publication under a corrected or new CVE ID, and should not take remediation action based on this rejected ID alone.
  • General hygiene: keep ILIAS installations on vendor-supported, currently patched releases and monitor the official ILIAS release/security channels for advisories.

References

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