What is CVE-2026-0555?

CVE-2026-0555 is a medium-severity vulnerability in Premmerce, classified under Cross-site Scripting. CVSS score: 6.4/10. Published 2026-02-07.

How severe is CVE-2026-0555?

Medium severity. CVSS v3 base score is 6.4 out of 10.

XSS in Premmerce

CVE-2026-0555

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).

Vulnerability class: XSS (Cross-Site Scripting)

EPSS: 0.002 (15.8th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 6.4 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N.

Affected products

Premmerce — versions 0

Weakness classification (CWE)

CWE-79 — Cross-site Scripting

References

Frequently asked questions

What is CVE-2026-0555?: CVE-2026-0555 is a medium-severity vulnerability in Premmerce, classified under Cross-site Scripting. CVSS score: 6.4/10. Published 2026-02-07.
How severe is CVE-2026-0555?: Medium severity. CVSS v3 base score is 6.4 out of 10.