CVE-2026-12399 json
Gutenverse <= 3.8.0 - Authenticated (Editor+) Stored Cross-Site Scripting via 'fonts[].font.font.value' Parameter
published 2026-06-27 4 mo ago modified 2026-06-29 4 mo ago also EUVD-2026-39959
- cvss
- 4.4
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.4%
- EPSS 0.4% chance of exploitation in 30 days, percentile 34%
- public exploits
- 0
- none known
Summary
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.
CISA SSVC
- Exploitation
- none
- Automatable
- no
- Technical impact
- partial
- Assessed
- 4 mo ago
Exploit prediction
0.40% chance of exploitation in the next 30 days, higher than 34% of all scored CVEs (FIRST EPSS, 2026-11-08).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 3.1 | 4.4 | CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:C/C:L/I:L/A:N |
Affected products
- jegstudio Gutenverse – WordPress Blocks, Page Builder & Site Editor
Classification
- Weakness
-
- CWE-79 Improper Neutralization of Input During Web Page Generation
- Technology feeds
References
- wordfence.com /threat-intel/vulnerabilities/id/fd1c679b-43e0-4e3a-ae2d-f6ff8a657512?source=cve
- plugins.trac.wordpress.org /browser/gutenverse/tags/3.8.0/lib/framework/helper.php#L1440
- plugins.trac.wordpress.org /browser/gutenverse/tags/3.8.0/lib/framework/includes/class-api.php#L1956
- plugins.trac.wordpress.org /browser/gutenverse/tags/3.8.0/lib/framework/includes/class-global-variable.php#L78
- plugins.trac.wordpress.org /browser/gutenverse/tags/3.8.0/lib/framework/includes/class-frontend-generator.php#L147
- plugins.trac.wordpress.org /browser/gutenverse/tags/3.8.0/lib/framework/helper.php#L1775
- plugins.trac.wordpress.org /browser/gutenverse/tags/3.6.3/lib/framework/helper.php#L1440
- plugins.trac.wordpress.org /browser/gutenverse/tags/3.6.3/lib/framework/includes/class-api.php#L1956
- plugins.trac.wordpress.org /browser/gutenverse/tags/3.6.3/lib/framework/includes/class-global-variable.php#L78
- plugins.trac.wordpress.org /browser/gutenverse/tags/3.6.3/lib/framework/includes/class-frontend-generator.php#L147
- plugins.trac.wordpress.org /browser/gutenverse/tags/3.6.3/lib/framework/helper.php#L1775
- plugins.trac.wordpress.org /changeset?sfp_email=&sfph_mail=&reponame=&old=3578328%40gutenverse&new=3578328%40gutenverse&sfp_email=&sfph_m
Sources
- CVE List CVE-2026-12399
- NVD CVE-2026-12399
Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.