What is GHSA-cfcv-65jq-76jw?

GHSA-cfcv-65jq-76jw is a security advisory published by GitHub Security Advisories with Low severity. The Custom Block Builder WordPress plugin before 4.3.0 does not consistently check the...

Which CVE IDs does GHSA-cfcv-65jq-76jw cover?

GHSA-cfcv-65jq-76jw covers the following CVE IDs: CVE-2026-8981. Each CVE has its own detail page on EchelonGraph Pulse with the synthesized EG score.

What is the CVSS v3 score of GHSA-cfcv-65jq-76jw?

GHSA-cfcv-65jq-76jw has a CVSS v3 base score of 3.5, published by GitHub Security Advisories.

GHSA-cfcv-65jq-76jwLowCVSS 3.5

The Custom Block Builder WordPress plugin before 4.3.0 does not consistently check the...

Vendor

GitHub Security Advisories

Published

June 9, 2026

Last Modified

June 9, 2026

🔗 CVE IDs covered (1)

CVE-2026-8981 →

📋 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.

🔗 References (3)

https://nvd.nist.gov/vuln/detail/CVE-2026-8981
https://wpscan.com/vulnerability/9815b0e6-e411-4a5c-9c63-30bad21da698
https://github.com/advisories/GHSA-cfcv-65jq-76jw