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CVE-2026-19943— Gutenverse <= 4.0.2 - Authenticated (Contributor+) Stored Cross-Site Scripting via 'titleTag' Block Attribute

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.

WordPress 插件 Gutenverse – WordPress Blocks, Page Builder & Site Editor 在所有不高于 4.0.2 的版本中均存在存储型跨站脚本（XSS）漏洞，该漏洞源于 'titleTag' 块属性中缺乏足够的输入清洗和输出转义。这使得具有贡献者级别及以上权限的攻击者能够在页面中注入任意网页脚本，当其他用户访问被注入的页面时，这些脚本将会执行。 恶意的 titleTag 值在保存时能够绕过 wp_kses_post 过滤，因为它被存储在块注释分隔符内。由于实时

CVSS 6.4 · Medium EPSS 0.20% · P10

Possible ATT&CK Techniques 1 AI

T1059 · Command and Scripting Interpreter

Affected Version Matrix 1

VendorProduct Version RangeStatus
jegstudio Gutenverse – WordPress Blocks, Page Builder & Site Editor ≤ 4.0.2 affected
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I. Basic Information for CVE-2026-19943

Vulnerability Information
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Vulnerability Title
Gutenverse <= 4.0.2 - Authenticated (Contributor+) Stored Cross-Site Scripting via 'titleTag' Block Attribute
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 '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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/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

Affected Products

Vendor Product Affected Versions CPE Subscribe
jegstudio Gutenverse – WordPress Blocks, Page Builder & Site Editor 0 ~ 4.0.2 -

II. Public POCs for CVE-2026-19943

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III. Intelligence Information for CVE-2026-19943

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Patches & Fixes for CVE-2026-19943 (5)

Security Blog Posts for CVE-2026-19943 (1)

IV. Related Vulnerabilities

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

V. Comments for CVE-2026-19943

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