CVE-2026-7421 Passeum Ticketing <= 1.0 - Authenticated (Administrator+) Stored Cross-Site Scripting via 'shop_name' Setting
Administrators can inject malicious scripts via the shop_name setting, leading to stored XSS affecting all site visitors on pages using the plugin's shortcodes.
- Exploited in the wild
- Not known
- Login needed
- An administrator
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-7421?
CVE-2026-7421 is a medium-severity cross-site scripting vulnerability in Passeum Ticketing, published on 2 Jun 2026. An attacker needs administrator access to exploit it, with no action from the victim.
Official 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.
Weakness: CWE-79
Which versions are affected by CVE-2026-7421?
How do I fix CVE-2026-7421?
No fix has been published for CVE-2026-7421 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-2026-7421 being exploited?
There is no known exploitation of CVE-2026-7421 in the wild and no public exploit code.
Sources
Also known as GHSA-4r7r-w926-gm5j.