CVE-2026-0555 Cross-site scripting in Premmerce
Authenticated attackers can inject arbitrary scripts into the Premmerce Wizard admin page via an AJAX endpoint, potentially leading to session hijacking or malicious actions.
- 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-2026-0555?
CVE-2026-0555 is a medium-severity cross-site scripting vulnerability in Premmerce, published on 7 Feb 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
The Premmerce plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the 'premmerce_wizard_actions' AJAX endpoint in all versions up to, and including, 1.3.20. This is due to missing capability checks and insufficient input sanitization and output escaping on the `state` parameter. 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 Premmerce Wizard admin page).
Weakness: CWE-79
Which versions are affected by CVE-2026-0555?
How do I fix CVE-2026-0555?
No fix has been published for CVE-2026-0555 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-2026-0555 being exploited?
There is no known exploitation of CVE-2026-0555 in the wild and no public exploit code.
Sources
Also known as GHSA-j5c2-jmjm-9ppm.