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CVE-2026-121491

CRITICAL 9.0 CVSS 3.1
Published
November 7, 2026
Last modified
November 7, 2026
NVD status
Received
Reported by
contact@wpscan.com
Weakness
CWE-94
CVSS vector
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H

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.

Affected WordPress components

A confirmed match is backed by the plugin or theme slug. A possible match is based on the product name only and should be verified.

Affected products and versions

  • Unknown Fiber Admin — From 3.1.0 (including) to 4.0.1 (excluding)

References

  • wpscan.com https://wpscan.com/vulnerability/42b9773d-9c69-4435-be20-ae86f52b4608/
  • nvd.nist.gov Official NVD record