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

2026-03-06 11:23

zaim

Strategic Overview

Status

Patched in 1.5.12

Affected PluginHammas Calendar

Affected Version<= 1.5.11

CVSS6.4Medium

CVECVE-2026-1902

View all Hammas Calendar vulnerabilities

Vulnerability Overview

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.

Technical Analysis

REMEDIATION: Update to version 1.5.12, or a newer patched version --- IDENTIFIER: CWE-79 (Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')) The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users.

External References

https://www.cve.org/CVERecord?id=CVE-2026-1902 https://www.wordfence.com/threat-intel/vulnerabilities/id/03956922-988a-4cb6-bf20-51878a5b1555

CVSS Vector

6.4

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N

Base

Attack VectorNetwork
Attack ComplexityLow
Privileges RequiredLow
User InteractionNone
ScopeChanged
ConfidentialityLow
IntegrityLow
AvailabilityNone

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