CVE-2026-19943 json
Gutenverse <= 4.0.2 - Authenticated (Contributor+) Stored Cross-Site Scripting via 'titleTag' Block Attribute
published 2026-08-25 2 mo ago modified 2026-10-12 28 d ago also EUVD-2026-65279
- cvss
- 6.4
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.3%
- EPSS 0.3% chance of exploitation in 30 days, percentile 28%
- 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 '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.
CISA SSVC
- Exploitation
- none
- Automatable
- no
- Technical impact
- partial
- Assessed
- 2 mo ago
Exploit prediction
0.35% chance of exploitation in the next 30 days, higher than 28% of all scored CVEs (FIRST EPSS, 2026-11-08).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 3.1 | 6.4 | CVSS:3.1/AV:N/AC:L/PR:L/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/b7eb4cac-cf16-438e-81cc-516646e77cdc?source=cve
- plugins.trac.wordpress.org /browser/gutenverse/tags/4.0.0/includes/block/class-chart.php#L80
- plugins.trac.wordpress.org /browser/gutenverse/tags/4.0.2/includes/block/class-chart.php#L80
- plugins.trac.wordpress.org /browser/gutenverse/tags/4.0.2/includes/block/class-chart.php#L28
- plugins.trac.wordpress.org /browser/gutenverse/tags/4.0.0/includes/block/class-chart.php#L28
- plugins.trac.wordpress.org /changeset?reponame=&old=3662715%40gutenverse&new=3662715%40gutenverse
Sources
- CVE List CVE-2026-19943
- NVD CVE-2026-19943
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.