CVE-2026-86790 WP Highlight Box <= 1.0 - Contributor+ Stored XSS via highlight-box Shortcode
Contributors can inject malicious scripts via shortcode attributes, leading to stored XSS attacks against site visitors.
- Exploited in the wild
- Not known
- Login needed
- An administrator
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- None listed
What is CVE-2026-86790?
CVE-2026-86790 is a medium-severity cross-site scripting vulnerability in Unknown WP Highlight Box, published on 12 Sep 2026. An attacker needs administrator access to exploit it, and only if a user opens a file or follows a link.
Official description
The WP Highlight Box WordPress plugin through 1.0 does not escape some shortcode attributes before outputting them in a page where the shortcode is embedded, which could allow users with the contributor role and above to perform Stored Cross-Site Scripting attacks.
Weakness: CWE-79
Which versions are affected by CVE-2026-86790?
How do I fix CVE-2026-86790?
No fix has been published for CVE-2026-86790 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-2026-86790 being exploited?
There is no known exploitation of CVE-2026-86790 in the wild and no public exploit code.
Sources
Also known as GHSA-c378-rx7g-g777.