Medium severity · published Jul 8, 2026
CVE-2026-6740
Nexter Blocks <= 4.7.4 - Authenticated (Contributor+) Stored Cross-Site Scripting via 'commentIcon' Block Attribute
6.4
CVSS
0.3%
EPSS
No
On KEV
Description
The Nexter Blocks – Gutenberg Blocks, Page Builder & AI Website Builder plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the 'commentIcon' parameter in all versions up to, and including, 4.7.4 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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N
Attack vector
Network
Complexity
Low
Privileges
Low
User interaction
None
Confidentiality
Low
Integrity
Low
Availability
None
Scope
Changed
Exploitation
Is it being used?
Exploit prediction (EPSS)0.3% · higher than 18% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
NB
Nexter Blocks – Gutenberg Blocks, Page Builder & AI Website Builder · posimyththemes
through 4.7.4 · source: vendor
Affected product
NB
Nexter Blocks – Gutenberg Blocks, Page Builder & AI Website Builder
posimyththemes
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-6740
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-6740
plugins.trac.wordpress.org
https://plugins.trac.wordpress.org/changeset/3512686/the-plus-addons-for-block-editor/trunk/classes/blocks/tp-post-meta/index.php
www.wordfence.com
https://www.wordfence.com/threat-intel/vulnerabilities/id/f5184598-b0bd-4026-971c-da36d79497df?source=cve
More from Nexter Blocks – Gutenberg Blocks, Page Builder & AI Website Builder
4.3
CVE-2026-15420
Nexter Blocks <= 5.0.0 - Authenticated (Subscriber+) Path Traversal to Arbitrary CSS/JS File Deletion via 'plus_name' Parameter