Arbitrary CSS Injection Vulnerability in Nexter Blocks Plugin for WordPress
CVE-2026-17011
Currently unrated
Key Information:
- Vendor
WordPress
- Status
- Vendor
- CVE Published:
- 9 August 2026
Badges
👾 Exploit Exists🟡 Public PoC
What is CVE-2026-17011?
The Nexter Blocks WordPress plugin prior to version 5.0.2 suffers from improper access control, allowing users with a Contributor role to save arbitrary CSS through its REST endpoints. This oversight enables potential attackers to inject CSS that can alter the site's appearance, facilitating methods such as site defacement, content hiding, and user interface manipulation. It emphasizes the need for stringent access control measures in plugin development to mitigate such security risks.
Affected Version(s)
Nexter Blocks 0 < 5.0.2
Exploit Proof of Concept (PoC)
PoC code is written by security researchers to demonstrate the vulnerability can be exploited. PoC code is also a key component for weaponization which could lead to ransomware.