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CVE-2026-12399— Gutenverse <= 3.8.0 - Authenticated (Editor+) Stored Cross-Site Scripting via 'fonts[].font.font.value' Parameter

Quick assessment

Affected
jegstudio Gutenverse – WordPress Blocks, Page Builder & Site Editor
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

jegstudio Gutenverse – WordPress Blocks, Page Builder & Site Editor是jegstudio个人开发者的WordPress块编辑器及页面构建插件。 jegstudio Gutenverse 3.8.0及之前版本存在跨站脚本漏洞，该漏洞源于输入清理和输出转义不足，可能导致经过身份验证的攻击者（编辑级别权限及以上）在页面中注入任意Web脚本。

CVSS 4.4 · Medium EPSS 0.40% · P32

Affected Version Matrix 1

VendorProduct Version RangeStatus
jegstudio Gutenverse – WordPress Blocks, Page Builder & Site Editor ≤ 3.8.0 affected
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I. Basic Information for CVE-2026-12399

Vulnerability Information
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Vulnerability Title
Gutenverse <= 3.8.0 - Authenticated (Editor+) Stored Cross-Site Scripting via 'fonts[].font.font.value' Parameter
Source: CVE Program / CVE List V5
Vulnerability Description
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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:C/C:L/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
在Web页面生成时对输入的转义处理不恰当(跨站脚本)
Source: CVE Program / CVE List V5
Vulnerability Title
jegstudio Gutenverse 跨站脚本漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
jegstudio Gutenverse – WordPress Blocks, Page Builder & Site Editor是jegstudio个人开发者的WordPress块编辑器及页面构建插件。 jegstudio Gutenverse 3.8.0及之前版本存在跨站脚本漏洞，该漏洞源于输入清理和输出转义不足，可能导致经过身份验证的攻击者（编辑级别权限及以上）在页面中注入任意Web脚本。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
jegstudio Gutenverse – WordPress Blocks, Page Builder & Site Editor 0 ~ 3.8.0 -

II. Public POCs for CVE-2026-12399

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III. Intelligence Information for CVE-2026-12399

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Patches & Fixes for CVE-2026-12399 (4)

IV. Related Vulnerabilities

Same product: Gutenverse – WordPress Blocks, Page Builder & Site Editor
Same vendor: jegstudio
Same weakness: CWE-79

V. Comments for CVE-2026-12399

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