CVE-2025-15678: CWE-79 Cross-Site Scripting (XSS) in Nexter Blocks
The Nexter Blocks WordPress plugin before 5.0.2 does not sanitize uploaded SVG files and allows SVG uploads for any user able to upload files (Author by default), allowing them to upload a file containing malicious JavaScript that executes when the file is accessed, leading to Stored Cross-Site Scripting.
AI Analysis
Technical Summary
The Nexter Blocks WordPress plugin prior to version 5.0.2 does not sanitize uploaded SVG files, permitting any user with upload capabilities (such as Authors) to upload SVG files containing embedded malicious JavaScript. When these SVG files are accessed, the embedded script executes, causing stored cross-site scripting (CWE-79). This vulnerability enables persistent XSS attacks via malicious SVG uploads.
Potential Impact
An attacker with upload permissions can upload SVG files containing malicious JavaScript that executes in the context of users accessing the file, potentially leading to session hijacking, defacement, or other malicious actions typical of stored XSS vulnerabilities.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until an official fix is available, restrict file upload permissions to trusted users only and consider disabling SVG uploads if possible.
CVE-2025-15678: CWE-79 Cross-Site Scripting (XSS) in Nexter Blocks
Description
The Nexter Blocks WordPress plugin before 5.0.2 does not sanitize uploaded SVG files and allows SVG uploads for any user able to upload files (Author by default), allowing them to upload a file containing malicious JavaScript that executes when the file is accessed, leading to Stored Cross-Site Scripting.
CVSS v3.1
Score 6.1medium
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
The Nexter Blocks WordPress plugin prior to version 5.0.2 does not sanitize uploaded SVG files, permitting any user with upload capabilities (such as Authors) to upload SVG files containing embedded malicious JavaScript. When these SVG files are accessed, the embedded script executes, causing stored cross-site scripting (CWE-79). This vulnerability enables persistent XSS attacks via malicious SVG uploads.
Potential Impact
An attacker with upload permissions can upload SVG files containing malicious JavaScript that executes in the context of users accessing the file, potentially leading to session hijacking, defacement, or other malicious actions typical of stored XSS vulnerabilities.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until an official fix is available, restrict file upload permissions to trusted users only and consider disabling SVG uploads if possible.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- WPScan
- Date Reserved
- 2026-07-24T10:09:42.179Z
- Cvss Version
- null
- State
- PUBLISHED
- Remediation Level
- null
Threat ID: 6a742932bf8831d53945d69f
Added to database: 08/06/2026, 06:26:58 UTC
Last enriched: 08/06/2026, 07:01:15 UTC
Last updated: 08/07/2026, 02:03:13 UTC
Views: 5
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