CVE-2026-3907 Hostel <= 1.1.7 - Authenticated (Contributor+) Stored Cross-Site Scripting via 'wphostel-book' Shortcode
Authenticated attackers with Contributor access can inject arbitrary scripts via the wphostel-book shortcode, leading to stored XSS.
- 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-2026-3907?
CVE-2026-3907 is a medium-severity cross-site scripting vulnerability in prasunsen Hostel, published on 10 Jul 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
The Hostel plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the 'wphostel-book' shortcode in all versions up to and including 1.1.7. This is due to insufficient input sanitization and output escaping on user-supplied shortcode attributes. Specifically, the second shortcode attribute (used as button text) is passed to the `$text` variable without sanitization at line 79 and then output directly into an HTML `value` attribute at line 91 without `esc_attr()` or any other escaping. This makes it possible for authenticated attackers, with Contributor-level access and above, to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page.
Weakness: CWE-79
Which versions are affected by CVE-2026-3907?
How do I fix CVE-2026-3907?
No fix has been published for CVE-2026-3907 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-2026-3907 being exploited?
There is no known exploitation of CVE-2026-3907 in the wild and no public exploit code.
Sources
Also known as GHSA-9hmh-43jg-fm2x.