CVE-2026-107751 Mang Board <= 2.4.3 - Unauthenticated Stored Cross-Site Scripting via 'user_name' Parameter
Unauthenticated attackers can inject arbitrary scripts via the user_name parameter in the Mang Board WordPress plugin, potentially leading to session hijacking or malicious actions.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-107751?
CVE-2026-107751 is a high-severity cross-site scripting vulnerability in kitae-park Mang Board, published on 14 Oct 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
The Mang Board plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the 'user_name' parameter in all versions up to, and including, 2.4.3 due to insufficient input sanitization and output escaping. This makes it possible for unauthenticated attackers to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page. The save-time sanitizer mbw_htmlspecialchars2() is ineffective against this vector because the exploit payload relies solely on unquoted HTML attribute syntax using only spaces, alphanumerics, and characters such as =, parentheses, and dots — none of which are escaped.
Weakness: CWE-79
Which versions are affected by CVE-2026-107751?
How do I fix CVE-2026-107751?
No fix has been published for CVE-2026-107751 yet. Limit exposure of the affected software until one is available.
Escape output for the context it lands in and set a strict Content Security Policy. Upgrading the affected component is the real fix. More about Cross-site scripting.
Is CVE-2026-107751 being exploited?
There is no known exploitation of CVE-2026-107751 in the wild and no public exploit code.
Sources
Also known as GHSA-w243-5v48-g4m5.