CVE-2026-3998 WM JqMath <= 1.3 - Authenticated (Contributor+) Stored Cross-Site Scripting via 'style' Shortcode Attribute
Authenticated attackers can inject arbitrary scripts via the style shortcode attribute, leading to stored XSS execution on victim pages.
- 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-2026-3998?
CVE-2026-3998 is a medium-severity cross-site scripting vulnerability in webmindpt WM JqMath, published on 15 Apr 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
The WM JqMath plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the 'style' shortcode attribute of the [jqmath] shortcode in all versions up to and including 1.3. This is due to insufficient input sanitization and output escaping on user-supplied shortcode attributes. The generate_jqMathFormula() function directly concatenates the 'style' attribute value into an HTML style attribute without applying esc_attr() or any other escaping. This makes it possible for authenticated attackers, with Contributor-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-2026-3998?
How do I fix CVE-2026-3998?
No fix has been published for CVE-2026-3998 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-2026-3998 being exploited?
There is no known exploitation of CVE-2026-3998 in the wild and no public exploit code.
Sources
Also known as GHSA-qq42-h26h-x735.