The Calendar plugin for WordPress is vulnerable to Reflected Cross-Site Scripting in versions before 1.3.8 due to insufficient input sanitization and output escaping. This makes it possible for unauthenticated attackers to inject arbitrary web scripts in pages that execute if they can successfully trick a user into performing an action such as clicking on a link.
This vulnerability is a high severity with CVSS 7.1 Cross-Site Scripting issue affecting the Plugin Calendar. It affects Versions before 1.3.8 and is fixed in 1.3.8.
Use the related hub and response guides to connect this vulnerability report with patch validation, scanner checks, and site hardening work.
Open the grouped hub for related CVEs, affected ranges, severity mix, and patch coverage.
Check access, XML-RPC exposure, backup readiness, and monitoring after patching.
Use containment, evidence capture, remediation, and validation steps when exploit risk is high.
the tracked vulnerability is tracked for the Plugin Calendar as high severity with CVSS 7.1. The affected range is Versions before 1.3.8. Update Calendar to 1.3.8 or newer where that version is compatible with the site.
Search engines and operators need more than a title. This page exposes the identifier, affected range, patch evidence, and source coverage that make the vulnerability actionable.
This report uses the upstream feed identifier because a CVE has not been attached to the record yet.
Affected version data gives operators a concrete comparison point against installed WordPress software.
A fixed version is present, so the page can answer update and remediation intent directly.
External references are available for source validation, advisory review, and incident notes.
Use these checks when converting this record into a patch ticket, incident note, or risk acceptance decision.
Inventory the installed Plugin package and compare its version with Versions before 1.3.8.
Confirm Calendar is updated to 1.3.8 or newer.
Review references and CVSS vector details for exploitability, authentication requirements, and exposure path.
After patching, re-run vulnerability monitoring and keep the related plugin or theme hub under review for follow-up CVEs.
| Software Type | Plugin |
|---|---|
| Software Slug |
calendar
View on wordpress.org
|
| CVE | No linked CVE entry. |
| Patched Versions |
1.3.8
|
| Affected Versions |
Versions before 1.3.8
|
These internal links group the same WordPress plugin by CVE, issue type, severity, and patch status so operators and search engines can connect the full vulnerability cluster.
Calendar <= 1.3.14 - Authenticated (Contributor+) SQL Injection via Shortcode
Calendar <= 1.3.16 - Authenticated (Contributor+) Stored Cross-Site Scripting via 'event_desc'
Calendar <= 1.3.10 - Authenticated Stored Cross-Site Scripting
Calendar <= 1.3.2 - Cross-Site Request Forgery
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