CVE-2026-12399
MediumCVSS 4.4Exploitation Probability (EPSS)
Low risk16th percentile - higher than 16% of all known CVEs
Summary
The Gutenverse plugin for WordPress is vulnerable to stored XSS via admin settings in all versions up to 3.8.0 due to insufficient input sanitization and output escaping.
Risk Assessment
Authenticated attackers with editor-level permissions or higher can inject arbitrary scripts that execute when users access affected pages. This affects multi-site installations and those with unfiltered_html disabled.
Recommendation
Update the Gutenverse plugin to the latest version immediately. For multi-site installations, restrict user permissions and enable HTML filtering.
Other vulnerabilities in Gutenverse
See all- CVE-2026-3002Medium
The Gutenverse – Ultimate WordPress FSE Blocks Addons & Ecosystem plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the multiple blocks in all versions up to, and including, 4.0.2 due to insufficient input sanitization and output escaping. This makes it possible for authenticated attackers, with Contributor-level access and above, to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page.
- CVE-2026-19943Medium
The Gutenverse – WordPress Blocks, Page Builder & Site Editor plugin for WordPress is vulnerable to Stored Cross-Site Scripting via 'titleTag' Block Attribute in all versions up to, and including, 4.0.2 due to insufficient input sanitization and output escaping. This makes it possible for authenticated attackers, with contributor-level access and above, to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page. The malicious titleTag value survives wp_kses_post on save because it is stored inside a block-comment delimiter and the live HTML is only synthesized at render time by do_blocks(), meaning the payload also fires in administrator and editor sessions during post preview.
- CVE-2026-2924Medium
The Gutenverse plugin for WordPress up to version 3.4.6 contains a stored XSS vulnerability via the 'imageLoad' parameter. Insufficient input sanitization and output escaping allow authenticated attackers with contributor-level access or higher to inject arbitrary web scripts.
Original NVD description (English source)
The Gutenverse – WordPress Blocks, Page Builder & Site Editor plugin for WordPress is vulnerable to Stored Cross-Site Scripting via admin settings in all versions up to, and including, 3.8.0 due to insufficient input sanitization and output escaping. This makes it possible for authenticated attackers, with editor-level permissions and above, to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page. This only affects multi-site installations and installations where unfiltered_html has been disabled.