CVE-2026-3907

Summary

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.

Affected Software

Weaknesses

• CWE-79: CWE-79 Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

ADP Enrichment

CISA ADP Vulnrichment

• SSVC:
• Exploitation: none
  • Automatable: no
  • Technical Impact: partial

References

• https://www.wordfence.com/threat-intel/vulnerabilities/id/30339c0d-6632-4073-b4d5-3bb4a5b8a58d?source=cve
• https://plugins.trac.wordpress.org/browser/hostel/tags/1.1.6/models/hostel.php#L195
• https://plugins.trac.wordpress.org/browser/hostel/trunk/controllers/shortcodes.php#L91
• https://plugins.trac.wordpress.org/browser/hostel/tags/1.1.6/controllers/shortcodes.php#L91
• https://plugins.trac.wordpress.org/browser/hostel/trunk/controllers/shortcodes.php#L79
• https://plugins.trac.wordpress.org/browser/hostel/tags/1.1.6/controllers/shortcodes.php#L79
• https://plugins.trac.wordpress.org/browser/hostel/trunk/models/hostel.php#L195
• https://plugins.trac.wordpress.org/changeset?reponame=&old=3480942%40hostel&new=3480942%40hostel

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