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CVE-2026-121491VulnerabilityPublished

The Fiber Admin WordPress plugin before 4.0.1 does not validate or escape a request header before writing it into a

Source GCVE Database

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Authoritative record:CVE-2026-121491· High

Not known to be exploited : upgrade to 4.0.1 soon.

Data as of 7 Nov 2026, 07:36 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

Upgrade the Fiber Admin WordPress plugin to version 4.0.1 or later, where this vulnerability is fixed. Since the plugin version 4.0.1 addresses this issue, applying the official update is the recommended remediation. No alternative mitigations are provided in the available data.

Description

The Fiber Admin WordPress plugin versions before 4.0.1 contains a vulnerability where it does not validate or escape a request header before writing it into a PHP file during an unprotected admin hook. This flaw allows unauthenticated attackers to execute arbitrary code if the plugin's custom database error page is enabled and the attacker can win a race condition against an administrator saving settings.

References

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