Gutenverse <= 4.0.2 - Authenticated (Contributor+) Stored Cross-Site Scripting via 'titleTag' Block Attribute
Key facts
- Attack vector
- Network
- Privileges required
- Low
- User interaction
- None
- Attack complexity
- Low
- Impact type
- Cross-site scripting
- Confidentiality · integrity · availability
- Low · Low · None
- Fix status
- No fix listed
Attack profile from CVSS 3.1 · CNA. Fix status from CNA. Impact type from CWE-79.
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.
Why it matters now
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- None
- Automatable
- No
- Technical impact
- Partial
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
Remediation
No fixed version listed by the sources yet.
Timeline
- 2026-10-02 Threatist record created from CVE-2026-19943
- 2026-10-03 Alias added: GHSA-548f-rjq8-x8r3
References
Other 6
- https://www.wordfence.com/threat-intel/vulnerabilities/id/b7eb4cac-cf16-438e-81cc-516646e77cdc?source=cve
- https://plugins.trac.wordpress.org/browser/gutenverse/tags/4.0.0/includes/block/class-chart.php#L80
- https://plugins.trac.wordpress.org/browser/gutenverse/tags/4.0.2/includes/block/class-chart.php#L80
- https://plugins.trac.wordpress.org/browser/gutenverse/tags/4.0.2/includes/block/class-chart.php#L28
- https://plugins.trac.wordpress.org/browser/gutenverse/tags/4.0.0/includes/block/class-chart.php#L28
- https://plugins.trac.wordpress.org/changeset?reponame=&old=3662715%40gutenverse&new=3662715%40gutenverse
More jegstudio vulnerabilities
- TI-2024-03445 Gutenverse < 1.9.1 - Contributor+ Stored XSS CVSS 3.1MEDIUM 6.1
- TI-2026-39635 WordPress Gutenverse Companion plugin <= 2.5.0 - Broken Access Control vulnerability CVSS 3.1HIGH 7.5
- TI-2026-47372 WordPress Gutenverse Companion plugin <= 2.5.1 - Server Side Request Forgery (SSRF) vulnerability CVSS 3.1HIGH 7.2
- TI-2025-40604 WordPress Gutenverse Form plugin <= 2.2.0 - Broken Access Control vulnerability CVSS 3.1MEDIUM 6.5
- TI-2023-17946 Missing authorization in jegstudio Gutenverse CVSS 3.1MEDIUM 5.3
- TI-2026-62492 Cross-site scripting in jegstudio Gutenverse – WordPress Blocks, Page Builder & Site… CVSS 3.1MEDIUM 6.4
Sources
- CVE-2026-19943 · CVE Program
- CVE-2026-19943 · NVD
- FIRST EPSS
- GHSA-548f-rjq8-x8r3 · GitHub Advisory Database · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences