CVE-2026-17011: CWE-345 Insufficient Verification of Data Authenticity in Nexter Blocks
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.
AI Analysis
Technical Summary
CVE-2026-17011 is an insufficient verification of data authenticity vulnerability (CWE-345) in the Nexter Blocks WordPress plugin. The flaw exists because the plugin does not restrict which users can save global CSS through one of its REST API endpoints. As a result, users with at least the Contributor role can inject arbitrary CSS that affects the entire site’s front-end rendering. This can lead to visual defacement, hiding of content, or UI redressing attacks. No CVSS score or vendor advisory is provided, and no patch or remediation information is available in the input data.
Potential Impact
Attackers with Contributor-level access can inject arbitrary CSS that is applied site-wide, potentially defacing the website, hiding legitimate content, or manipulating the user interface to mislead visitors. This could degrade user trust and site integrity but does not directly indicate code execution or data exfiltration from the provided data.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until an official fix is available, restrict Contributor role permissions or disable the vulnerable REST endpoint if possible to prevent unauthorized CSS injection.
CVE-2026-17011: CWE-345 Insufficient Verification of Data Authenticity in Nexter Blocks
Description
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.
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
CVE-2026-17011 is an insufficient verification of data authenticity vulnerability (CWE-345) in the Nexter Blocks WordPress plugin. The flaw exists because the plugin does not restrict which users can save global CSS through one of its REST API endpoints. As a result, users with at least the Contributor role can inject arbitrary CSS that affects the entire site’s front-end rendering. This can lead to visual defacement, hiding of content, or UI redressing attacks. No CVSS score or vendor advisory is provided, and no patch or remediation information is available in the input data.
Potential Impact
Attackers with Contributor-level access can inject arbitrary CSS that is applied site-wide, potentially defacing the website, hiding legitimate content, or manipulating the user interface to mislead visitors. This could degrade user trust and site integrity but does not directly indicate code execution or data exfiltration from the provided data.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until an official fix is available, restrict Contributor role permissions or disable the vulnerable REST endpoint if possible to prevent unauthorized CSS injection.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- WPScan
- Date Reserved
- 2026-07-24T10:10:03.572Z
- Cvss Version
- null
- State
- PUBLISHED
- Remediation Level
- null
Threat ID: 6a781a2ebf8831d5391ffee7
Added to database: 08/09/2026, 06:11:58 UTC
Last enriched: 08/09/2026, 06:33:12 UTC
Last updated: 08/10/2026, 00:41:13 UTC
Views: 10
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