CVE-2026-121491

CVE-2026-121491CVE-2026-121491

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.

Scoring

CVSS 9.0 ()
VectorCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H
Last modified2026-11-07
Sourced from NVD. Curated for EU compliance use cases by Adam Lundqvist, Founder at SQUR.