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.
Metrics
Affected Vendors & Products
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References
History
Tue, 09 Jun 2026 07:45:00 +0000
| Type | Values Removed | Values Added |
|---|---|---|
| Weaknesses | CWE-79 |
Tue, 09 Jun 2026 06:15:00 +0000
| Type | Values Removed | Values Added |
|---|---|---|
| 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. | |
| Title | Lazy Blocks < 4.3.0 - Admin+ Stored XSS via Custom Block Frontend HTML | |
| References |
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MITRE
Status: PUBLISHED
Assigner: WPScan
Published:
Updated: 2026-06-09T06:00:09.486Z
Reserved: 2026-05-19T13:11:53.990Z
Link: CVE-2026-8981
Vulnrichment
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NVD
Status : Received
Published: 2026-06-09T06:16:54.067
Modified: 2026-06-09T06:16:54.067
Link: CVE-2026-8981
Redhat
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OpenCVE Enrichment
Updated: 2026-06-09T07:30:26Z