What’s Vulnerable › Vulnerabilities

CVE-2026-1902: Hammas Calendar <= 1.5.11 - Authenticated (Contributor+) Stored Cross-Site Scripting via 'apix' Shortcode Attribute

• Severity: medium (CVSS 6.4 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-03-07 · updated 2026-06-17
• Weakness: CWE-79

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.

Affected products

• innovaatik Hammas Calendar: through 1.5.11

References

• https://plugins.trac.wordpress.org/browser/hammas-calendar/tags/1.5.11/hp-calendar.php#L37
• https://plugins.trac.wordpress.org/browser/hammas-calendar/tags/1.5.11/src/HpPlugin.php#L54
• https://plugins.trac.wordpress.org/changeset?sfp_email=&sfph_mail=&reponame=&old=3474583%40hammas-calendar&new=3474583%40hammas-calendar&sfp_email=&sfph_mail=
• https://www.wordfence.com/threat-intel/vulnerabilities/id/03956922-988a-4cb6-bf20-51878a5b1555?source=cve

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