CVE-2026-121491

CriticalCVSS 9.0/10Last modified Nov 10, 2026

Description

The Fiber Admin WordPress plugin before 4.0.1 does not validate or escape a request header before writing it into a PHP file it regenerates on an unprotected admin hook, allowing unauthenticated attackers to execute arbitrary code when its custom database error page is enabled and they win a race against an administrator saving its settings.

Metrics

CVSS 3.1 9.0/10CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H

Weakness enumeration

CWE-94

Affected software

No affected versions have been published.

Timeline

Published: Nov 7, 2026
Last modified: Nov 10, 2026
NVD status: Deferred

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