Nexter Extension <= 4.4.1 - Authenticated (Contributor+) Stored Cross-Site Scripting via Shortcode
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 Nexter Extension – Site Enhancements Toolkit plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the plugin's 'nxt-year' shortcode in all versions up to, and including, 4.4.1 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.
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
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| posimyththemes | Nexter Extension – Security, Performance, Code Snippets & Site Toolkit | up to 4.4.1 | — | No fix listed | CNA |
- Nexter Extension – Security, Performance, Code Snippets & Site Toolkit Vendorposimyththemes Affected up to 4.4.1 Fixed in — No fix listed CNA
Remediation
No fixed version listed by the sources yet.
Timeline
- 2026-10-02 Threatist record created from CVE-2025-13731
- 2026-10-03 Alias added: GHSA-vjv3-j4fq-22rw
References
Other 4
- https://www.wordfence.com/threat-intel/vulnerabilities/id/809cd97c-22ea-49e7-be46-688fefe50236?source=cve
- https://plugins.trac.wordpress.org/browser/nexter-extension/trunk/include/class-nexter-load-ext.php#L66
- https://plugins.trac.wordpress.org/browser/nexter-extension/trunk/include/class-nexter-load-ext.php#L136
- https://plugins.trac.wordpress.org/changeset?old=3402155&old_path=nexter-extension%2Ftags%2F4.4.1%2Finclude%2Fclass-nexter-load-ext.php&new=3403967&new_path=nexter-extension%2Ftags%2F4.4.2%2Finclude%2Fclass-nexter-load-ext.php
More posimyththemes vulnerabilities
- TI-2023-25501 WordPress The Plus Addons for Elementor Pro plugin <= 5.2.8 - Unauthenticated Local File Inclusion vulnerability CVSS 3.1CRITICAL 9.8
- TI-2021-06467 The Plus Addons for Elementor Page Builder < 4.1.7 - Authentication Bypass CVSS 3.1CRITICAL 9.8
- TI-2023-24458 WordPress Nexter Theme <= 2.0.3 is vulnerable to SQL Injection CVSS 3.1CRITICAL 9.8
- TI-2021-07228 The Plus Addons for Elementor Pro < 5.0.7 - Unauthenticated SQL Injection CVSS 3.1CRITICAL 9.8
- TI-2021-03189 Missing authorization in posimyththemes The Plus Addons for Elementor – Addons for… CVSS 3.1HIGH 8.8
- TI-2024-05069 The Plus Addons for Elementor – Elementor Addons, Page Templates, Widgets, Mega Menu… CVSS 3.1HIGH 8.8
Sources
- CVE-2025-13731 · CVE Program
- CVE-2025-13731 · NVD
- FIRST EPSS
- GHSA-vjv3-j4fq-22rw · 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