Unrated severityNVD Advisory· Published Jun 9, 2026

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.

Affected products

WordPress/Custom Block Builderinferred2 versions
<4.3.0+ 1 more
- (no CPE)range: <4.3.0
- (no CPE)range: <4.3.0
Package: https://wordpress.org/plugins/custom-block-builder

Patches

No patches discovered yet.

Vulnerability mechanics

No source-code context for this CVE — mechanics is only generated when we can read the actual fix diff. Without that, the four sections (root cause, attack vector, affected code, fix) would be speculation rather than analysis.

References

wpscan.com/vulnerability/9815b0e6-e411-4a5c-9c63-30bad21da698/nvd

News mentions

No linked articles in our index yet.

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