CVE-2026-15021 wpForo Forum <= 3.1.1 - Authenticated (Subscriber+) Stored Cross-Site Scripting via 'location' Profile Field
Authenticated attackers can inject arbitrary scripts via the location profile field, leading to code execution when other users view the profile.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-15021?
CVE-2026-15021 is a medium-severity cross-site scripting vulnerability in tomdever wpForo Forum, published on 16 Jul 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
The wpForo Forum plugin for WordPress is vulnerable to Stored Cross-Site Scripting via 'location' Profile Field in all versions up to, and including, 3.1.1 due to insufficient input sanitization and output escaping. This makes it possible for authenticated attackers, with subscriber-level access and above, to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page. The sanitize_text_field() function applied at input does not encode double quotes, allowing attribute breakout via a payload that escapes the href attribute context and injects event handler attributes.
Weakness: CWE-79
Which versions are affected by CVE-2026-15021?
How do I fix CVE-2026-15021?
No fix has been published for CVE-2026-15021 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-2026-15021 being exploited?
There is no known exploitation of CVE-2026-15021 in the wild and no public exploit code.
Sources
Also known as GHSA-76cp-m73j-f6wq.