CVE-2026-8981
Lazy Blocks < 4.3.0 - Admin+ Stored XSS via Custom Block Frontend HTML
- State
- Published
- Severity
- 3.5 Low
- Published
- Jun 9, 2026
- Updated
- Jun 9, 2026
- Reserved
- May 19, 2026
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.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 3.1 | 3.5 Low | CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:U/C:L/I:L/A:N | CISA-ADP |
Weaknesses
- CWE-79 Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
Affected Products
| Product | Versions |
|---|---|
Custom Block BuilderUnknown |
|
References
- https://wpscan.com/vulnerability/9815b0e6-e411-4a5c-9c63-30bad21da698/exploitvdb-entrytechnical-description
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