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CVE-2026-8981

LOW 3.5 CVSS 3.1
Published
June 9, 2026
Last modified
July 23, 2026
NVD status
Deferred
Reported by
contact@wpscan.com
Weakness
CWE-79
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:U/C:L/I:L/A:N

Description

The Custom Block Builder WordPress plugin before 4.3.0 does not consistently check the unfiltered_html capability across all paths that write to its block template code fields, allowing administrators on multisite installations (or single-site installs with DISALLOW_UNFILTERED_HTML defined) to inject arbitrary JavaScript that executes for any visitor of pages embedding the affected block.

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 Custom Block Builder — Before 4.3.0

References

  • wpscan.com https://wpscan.com/vulnerability/9815b0e6-e411-4a5c-9c63-30bad21da698/
  • nvd.nist.gov Official NVD record