Threat intelligence

Gutenberg Essential Blocks <= 6.0.4 - Authenticated (Contributor+) Stored Cross-Site Scripting via Block Attributes

CVE-2026-4658 · essential-blocks

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

Vulnerability: Gutenberg Essential Blocks <= 6.0.4 - Authenticated (Contributor+) Stored Cross-Site Scripting via Block Attributes
Affected software: essential-blocks(Plugin)
Affected versions: ≤ 6.0.4
Authentication: Authenticated (see advisory title)
Vulnerability type: Cross-site scripting
CVE: CVE-2026-4658
Published: 1 May 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 3e7eed9d-2d44-4951-b66b-7d8995ca617d). Methodology and redistribution notes

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