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VulnerabilityPublished

CVE-2026-121491: Fiber Admin (WordPress plugin) · Code Injection

Affects Fiber Admin (WordPress plugin)Source CVE Database V5

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Not known to be exploited : upgrade to 4.0.1 soon.

Data as of 7 Nov 2026, 06:05 UTC

Severity
High

Rated High by Threat Radar's AI analysis · CVSS not yet scored by NVD

Thin evidence

One scorer or none
Patch
Available – fixed in 4.0.1

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 7 Nov 2026

  2. Detectable: no evidence on record.

    No public nuclei template indexed

  3. Weaponized: no evidence on record.

    No public exploit code indexed in Metasploit or Exploit-DB

  4. Exploited in the wild: no evidence on record.

    Not in CISA KEV and no source reports exploitation

  5. Observed by OffSeq Mirage: no evidence on record.

    No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 6 Nov 2026.

What to do

Upgrade Fiber Admin (WordPress plugin) to 4.0.1.

Affected software

ProductAffectedFixed in
Fiber AdminAffected
  • >=3.1.0 <4.0.1
Fixed in
  • 4.0.1

AI-suggested

Update the Fiber Admin plugin to version 4.0.1 or later, where this vulnerability is fixed. No other mitigation is indicated by the vendor advisory.

Description

CVE-2026-121491 is a code injection vulnerability in the Fiber Admin WordPress plugin versions 3.1.0 up to but not including 4.0.1. The flaw arises because the plugin does not validate or escape a request header before writing it into a PHP file during an unprotected admin hook. This allows unauthenticated attackers to execute arbitrary code if the plugin's custom database error page is enabled and they successfully race against an administrator saving settings.

References

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