CVE-2026-66887

Critical CVSS 9.6

Published 2026-09-15 · last changed 2026-09-18

The fix

We hold no Microsoft remediation data for CVE-2026-66887, which normally means it is not a Windows CVE. For non-Microsoft software the fix is the vendor's own updated release, and the affected versions are listed below.

What it is

The affected products are missing authorization on state-changing CGIs and session checks are not performed.

Sources

NVD record for CVE-2026-66887

CVSS vector: CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H