Nexter Blocks < 5.0.2 - Author+ Stored XSS via SVG Upload
Priority MEDIUM 60CWE-79Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- Required
- Attack complexity
- Low
- Impact type
- Cross-site scripting
- Confidentiality · integrity · availability
- Low · Low · None
- Fix status
- Fixed
Attack profile from CVSS 3.1 · CISA ADP. Fix status from CNA. Impact type from CWE-79.
Summary
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.
Why it matters now
Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.00253 16th percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by the CNA
Fix Fixed Nexter Blocks (Unknown): 5.0.2
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- Poc
- 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 |
|---|---|---|---|---|---|
| Unknown | Nexter Blocks | before 5.0.2 | 5.0.2 | Patch available | CNA |
- Nexter Blocks VendorUnknown Affected before 5.0.2 Fixed in 5.0.2 Patch available CNA
Remediation
- Fix · CNA Nexter Blocks (Unknown) Fixed in 5.0.2
Timeline
- 2026-10-02 Threatist record created from CVE-2025-15678
- 2026-10-03 Alias added: GHSA-mg54-xc87-q8w3
References
Sources
- CVE-2025-15678 · CVE Program
- CVE-2025-15678 · NVD
- FIRST EPSS
- GHSA-mg54-xc87-q8w3 · 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