Nexter Blocks < 5.0.2 - Contributor+ Stored CSS Injection
Priority LOW 17CWE-345Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- High
- User interaction
- None
- Attack complexity
- Low
- Impact type
- Security bypass
- Confidentiality · integrity · availability
- None · Low · Low
- Fix status
- Fixed
Attack profile from CVSS 3.1 · CISA ADP. Fix status from CNA. Impact type from CWE-345.
Summary
The Nexter Blocks WordPress plugin before 5.0.2 does not restrict who can save global CSS through one of its REST endpoints, allowing users with at least the Contributor role to store arbitrary CSS that is rendered site-wide on the front end, enabling defacement, content hiding, and UI redressing.
Why it matters now
Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.0017 6th 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
- 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 |
|---|---|---|---|---|---|
| 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-2026-17011
- 2026-10-03 Alias added: GHSA-gf2c-5g46-3crp
References
Sources
- CVE-2026-17011 · CVE Program
- CVE-2026-17011 · NVD
- FIRST EPSS
- GHSA-gf2c-5g46-3crp · 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