Security Alert Summary
The Hostel plugin for WordPress contains a reflected cross-site scripting (XSS) vulnerability in the shortcode_id parameter affecting all versions up to and including 1.1.6. An unauthenticated attacker can inject script that may execute in a user’s browser if the user is tricked into interacting with a crafted link or input.
CVE Details
- CVE ID: CVE-2026-1838
- Affected component: Hostel plugin for WordPress
- Affected versions: All versions up to and including 1.1.6
- Published: April 18, 2026 at 02:16:11 AM
- Last modified: April 18, 2026 at 02:16:11 AM
- CVSS v3.1: 6.1 (MEDIUM) — Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
- Authentication / privileges / user interaction: No authentication or privileges required; user interaction required
- Primary impact: Confidentiality: Low; Integrity: Low; Availability: None
- Weakness: CWE-79 (Improper Neutralization of Input During Web Page Generation)
Technical Details
This is a reflected Cross-Site Scripting (XSS) issue caused by insufficient input sanitization and output escaping of the shortcode_id parameter. The plugin reflects untrusted input into pages without proper neutralization, allowing an attacker to craft a URL or payload that injects arbitrary script which will execute in the context of a victim’s browser when they interact with the crafted content.
The report includes references to plugin code locations where the parameter is handled, including controllers/ajax.php, hostel.php, and views/partial/rooms-table.html.php. The vulnerability is present in all versions up to and including 1.1.6.
The observed impact is limited to client-side script execution (reflected XSS). Because the vector requires user interaction and the CVSS impacts are Low for confidentiality and integrity with no availability impact, the issue does not by itself indicate server-side takeover or direct service disruption.
How This Could Impact Your Website
On a site with multiple users, an attacker could send a crafted link containing a malicious shortcode_id value to site owners, internal staff, contributors, or external contractors. If a recipient views the affected page and the injected script executes in their browser, the attacker could attempt to read data available in the page context or perform UI-based actions that the user can perform.
Practical consequences may include exposure of user-visible data such as internal email addresses or other page content, and an increased risk of targeted phishing or social engineering that leverages information seen by the victim. The risk is primarily client-side and depends on which users are exposed to the affected pages and links.
If you’re unsure whether your site is affected or how to assess your current user roles and plugins, it may be worth having a professional review your setup.
Recommended Actions
- Update the affected plugin as soon as a patched version is available.
- Review and reduce unnecessary user roles, especially contributors.
- Enforce strong passwords and two-factor authentication for editors and administrators.
- Remove unused or unmaintained plugins.
- Monitor site activity and logs for unusual behavior related to user sessions and page inputs.
If you’d like help reviewing your plugins, user roles, or overall WordPress security posture, our team at Freshy is happy to help.
References
- https://plugins.trac.wordpress.org/browser/hostel/tags/1.1.6/controllers/ajax.php#L28
- https://plugins.trac.wordpress.org/browser/hostel/tags/1.1.6/hostel.php#L44
- https://plugins.trac.wordpress.org/browser/hostel/tags/1.1.6/views/partial/rooms-table.html.php#L29
- https://plugins.trac.wordpress.org/browser/hostel/trunk/controllers/ajax.php#L28
- https://plugins.trac.wordpress.org/browser/hostel/trunk/hostel.php#L44
- https://plugins.trac.wordpress.org/browser/hostel/trunk/views/partial/rooms-table.html.php#L29
- https://plugins.trac.wordpress.org/changeset/3478265/hostel/trunk/hostel.php
- https://plugins.trac.wordpress.org/changeset?old_path=%2Fhostel/tags/1.1.6&new_path=%2Fhostel/tags/1.1.7
- https://www.wordfence.com/threat-intel/vulnerabilities/id/2b9da491-771a-4100-b41a-7411981dd34b?source=cve
