CVE-2026-75528 Broken Link Checker <= 2.4.13 - Unauthenticated Stored Cross-Site Scripting via Comment Author URL / Link Log
Unauthenticated attackers can inject arbitrary scripts via comment author URLs, executing code when administrators review link logs.
- 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-2026-75528?
CVE-2026-75528 is a high-severity cross-site scripting vulnerability in wpmudev Broken Link Checker, published on 2 Sep 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
The Broken Link Checker plugin for WordPress is vulnerable to Stored Cross-Site Scripting via Comment Author URL / Link Log in all versions up to, and including, 2.4.13 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. Exploitation requires an administrator to perform the plugin's standard dismiss-and-recheck workflow on a link submitted by the attacker via the WordPress comment author URL field, after which the attacker's HTTP server issues a redirect to a URL containing an HTML/JavaScript payload that is stored verbatim in the link log.
Weakness: CWE-79
Which versions are affected by CVE-2026-75528?
How do I fix CVE-2026-75528?
No fix has been published for CVE-2026-75528 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-2026-75528 being exploited?
There is no known exploitation of CVE-2026-75528 in the wild and no public exploit code.
Sources
Also known as GHSA-qpv7-fm86-f6w8.