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VulnerabilityPublished

CVE-2026-127048: Custom Block Builder (WordPress plugin) · Code Injection

Affects Custom Block Builder (WordPress plugin)Source CVE Database V5

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Not known to be exploited : upgrade to 3.0.0 soon.

Data as of 15 Nov 2026, 06:23 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 3.0.0

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 15 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 14 Nov 2026.

What to do

Upgrade Custom Block Builder (WordPress plugin) to 3.0.0.

Affected software

ProductAffectedFixed in
Custom Block BuilderAffected
  • <3.0.0
Fixed in
  • 3.0.0

AI-suggested

Upgrade the Custom Block Builder plugin to version 3.0.0 or later, where this vulnerability is fixed. No other mitigation is required as the fix addresses the root cause.

Description

The Custom Block Builder WordPress plugin before version 3.0.0 contains a code injection vulnerability due to improper permission checks on its REST routes. This flaw allows unauthenticated users to execute arbitrary PHP code on the server. The issue is fixed in version 3.0.0.

References

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