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6.4
Hammas Calendar Plugin Allows Attackers to Inject Malicious Code
CVE-2026-1902
Summary
The Hammas Calendar plugin for WordPress is open to a security risk. Attackers with contributor access can inject malicious code that can be executed when other users visit affected pages. Update the plugin to a version above 1.5.11 to fix this issue.
Original title
The Hammas Calendar plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the 'apix' parameter in the 'hp-calendar-manage-redirect' shortcode in all versions up to, and including, 1...
Original description
The Hammas Calendar plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the 'apix' parameter in the 'hp-calendar-manage-redirect' shortcode in all versions up to, and including, 1.5.11 due to insufficient input sanitization and output 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.
nvd CVSS3.1
6.4
Vulnerability type
CWE-79
Cross-site Scripting (XSS)
- https://plugins.trac.wordpress.org/browser/hammas-calendar/tags/1.5.11/hp-calend...
- https://plugins.trac.wordpress.org/browser/hammas-calendar/tags/1.5.11/src/HpPlu...
- https://plugins.trac.wordpress.org/changeset?sfp_email=&sfph_mail=&reponame=&old...
- https://www.wordfence.com/threat-intel/vulnerabilities/id/03956922-988a-4cb6-bf2...
Published: 7 Mar 2026 · Updated: 13 Mar 2026 · First seen: 7 Mar 2026