CVE-2026-14827
Deferred Deferred - Pending Action

Stored Cross-Site Scripting in Calendar WordPress Plugin

Publication date: 2026-07-27

Last updated on: 2026-07-27

Assigner: WPScan

Description
The Calendar WordPress plugin before 1.3.18 does not properly escape a user-supplied event field before outputting it inside an HTML attribute on a public-facing page, allowing users with the Contributor role to inject arbitrary JavaScript that executes in the browser of anyone viewing the calendar.

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Meta Information

Published
2026-07-27
Last Modified
2026-07-27
Generated
2026-08-16
AI Q&A
2026-07-27
EPSS Evaluated
2026-08-15
NVD
CVE-2026-14827
EUVD
EUVD-2026-49084

Affected Vendors & Products

Showing 1 associated CPE
Vendor Product Version / Range
calendar calendar to 1.3.18 (exc)

Helpful Resources

Exploitability

CWE
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KEV
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CWE ID Description
CWE-79 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.

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Executive Summary

This is a stored Cross-Site Scripting (XSS) vulnerability in the Calendar WordPress plugin before version 1.3.18. It occurs because the plugin does not properly escape user input in the event_link parameter, allowing Contributor-level users to inject malicious JavaScript into the Link field of an event. When visitors view the calendar, the injected script executes in their browsers, such as when hovering over the event link.

Detection Guidance

Check if the Calendar WordPress plugin version is below 1.3.18. Log in as a Contributor and inspect event creation forms for the event_link parameter. Look for JavaScript code in the Link field of events.

Impact Analysis

If you are a visitor viewing a calendar with this vulnerability, malicious JavaScript could execute in your browser without your knowledge. This could lead to theft of session cookies, redirection to phishing sites, or other malicious actions. If you are a WordPress site administrator, an attacker with Contributor access could exploit this to compromise your site or visitors.

Compliance Impact

This vulnerability could lead to unauthorized access to user data, which may violate GDPR (data protection) and HIPAA (health information privacy) requirements. If exploited, it could result in data breaches, leading to legal penalties, reputational damage, and loss of trust. Organizations must address this to maintain compliance.

Mitigation Strategies

Update the Calendar plugin to version 1.3.18 or later immediately. If updating is not possible, disable the plugin until a patch is applied. Review all events for suspicious JavaScript code in the Link field.

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