CVE-2026-2387 Event Organiser <= 3.12.9 - Authenticated (Contributor+) Stored Cross-Site Scripting via eo_events Shortcode
Authenticated attackers with Contributor access can inject arbitrary scripts via the eo_events shortcode, 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-2026-2387?
CVE-2026-2387 is a medium-severity cross-site scripting vulnerability in stephenharris Event Organiser, published on 1 Jul 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
The Event Organiser plugin for WordPress is vulnerable to Stored Cross-Site Scripting in all versions up to, and including, 3.12.9. This is due to the 'eo_events' shortcode accepting attacker-controlled 'no_events' content and rendering it in event list templates without output 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-2026-2387?
How do I fix CVE-2026-2387?
No fix has been published for CVE-2026-2387 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-2026-2387 being exploited?
There is no known exploitation of CVE-2026-2387 in the wild and no public exploit code.
Sources
Also known as GHSA-fmmj-9298-j37p.