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CVE-2026-127048VulnerabilityPublished

The Custom Block Builder WordPress plugin before 3.0.0 does not properly deny unauthorised requests to its REST

Source GCVE Database

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Authoritative record:CVE-2026-127048· High

Not known to be exploited : upgrade to 3.0.0 soon.

Data as of 15 Nov 2026, 10:38 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

If you cannot patch yet, it is recommended to disable or remove the Custom Block Builder plugin if it is installed and running a version prior to 3.0.0 to prevent exploitation.

Description

The Custom Block Builder WordPress plugin versions before 3.0.0 contain a vulnerability where unauthorized requests to its REST API routes are not properly denied. This occurs because the plugin's permission checks return a non-error response that WordPress interprets as authorization granted. As a result, unauthenticated users can execute arbitrary PHP code on the server.

References

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