CVE-2026-9626 JSON API User <= 4.1.0 - Authenticated (Subscriber+) Stored Cross-Site Scripting via 'content' Parameter
Authenticated attackers can inject arbitrary scripts via the comment content parameter, leading to stored XSS execution for other users.
- 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-2026-9626?
CVE-2026-9626 is a medium-severity cross-site scripting vulnerability in parorrey JSON API User, published on 3 Jul 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
The JSON API User plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the 'content' parameter of the post_comment API endpoint in versions up to, and including, 4.1.0 This is due to insufficient input sanitization in the post_comment() function, which passes the attacker-controlled comment_content value directly to wp_insert_comment() without applying any HTML sanitization, and additionally allows the caller to set comment_approved=1 to self-approve the comment and bypass moderation. 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.
Weakness: CWE-79
Which versions are affected by CVE-2026-9626?
How do I fix CVE-2026-9626?
No fix has been published for CVE-2026-9626 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-2026-9626 being exploited?
There is no known exploitation of CVE-2026-9626 in the wild and no public exploit code.
Sources
Also known as GHSA-4689-rgvq-62r3.