CVE-2026-109998 Mang Board <= 2.4.3 - Unauthenticated Stored Cross-Site Scripting via 'content' Parameter via content_reply AJAX
Unauthenticated attackers can inject arbitrary scripts via the content parameter, leading to script execution in victim browsers.
- 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-2026-109998?
CVE-2026-109998 is a high-severity cross-site scripting vulnerability in kitae-park Mang Board, published on 16 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 'content' 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. This is exploitable because the wp_ajax_nopriv_mb_template endpoint is publicly accessible without authentication, nonce verification is not enforced for the content_reply mode, and admin-ajax.php responds with Content-Type: text/html, causing browsers to execute injected tags embedded in the JSON response body.
Weakness: CWE-79
Which versions are affected by CVE-2026-109998?
How do I fix CVE-2026-109998?
No fix has been published for CVE-2026-109998 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-2026-109998 being exploited?
There is no known exploitation of CVE-2026-109998 in the wild and no public exploit code.
Sources
Also known as GHSA-whj8-6p7v-qjm7.