Threat intelligence

Custom Block Builder – Lazy Blocks < 4.3.0 - Authenticated (Administrator+) Stored Cross-Site Scripting

CVE-2026-8981 · lazy-blocks

Important: Seeing this vulnerability listed does not mean your website is affected. Exposure depends on whether you run Lazy Blocks at a vulnerable version. How SiteRespond intelligence works

Vulnerability: Custom Block Builder – Lazy Blocks < 4.3.0 - Authenticated (Administrator+) Stored Cross-Site Scripting
Affected software: lazy-blocks(Plugin)
Affected versions: < 4.3.0
Authentication: Authenticated (see advisory title)
Vulnerability type: Cross-site scripting
CVE: CVE-2026-8981
Published: 11 June 2026
CISA KEV: Not listed in CISA KEV at last catalog refresh
Impact: May allow attackers to run scripts in visitors' browsers or hijack admin sessions.
Source: Data imported from Wordfence Intelligence (advisory 5655d60b-cfd6-40b3-ad64-81db4c54ab3f). Methodology and redistribution notes

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