CVE-2026-40308— My Calendar: Unauthenticated Information Disclosure (IDOR) via Multisite switch_to_blog
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I. Basic Information for CVE-2026-40308
Vulnerability Information
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Vulnerability Title
My Calendar: Unauthenticated Information Disclosure (IDOR) via Multisite switch_to_blog
Source: NVD (National Vulnerability Database)
Vulnerability Description
My Calendar is a WordPress plugin for managing calendar events. In versions 3.7.6 and below, the mc_ajax_mcjs_action AJAX endpoint, registered for unauthenticated users, passes user-supplied arguments through parse_str() without validation, allowing injection of arbitrary parameters including a site value. On WordPress Multisite installations, this enables an unauthenticated attacker to call switch_to_blog() with an arbitrary site ID and extract calendar events from any sub-site on the network, including private or hidden events. On standard Single Site installations, switch_to_blog() does not exist, causing an uncaught PHP fatal error and crashing the worker thread, creating an unauthenticated denial of service vector. This issue has been fixed in version 3.7.7.
Source: NVD (National Vulnerability Database)
CVSS Information
N/A
Source: NVD (National Vulnerability Database)
Vulnerability Type
通过用户控制密钥绕过授权机制
Source: NVD (National Vulnerability Database)
Vulnerability Title
WordPress plugin My Calendar 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
WordPress和WordPress plugin都是WordPress基金会的产品。WordPress是一套使用PHP语言开发的博客平台。该平台具有在基于PHP和MySQL的服务器上架设个人博客网站的功能。WordPress plugin是一个应用插件。 WordPress plugin My Calendar 3.7.6及之前版本存在安全漏洞，该漏洞源于mc_ajax_mcjs_action AJAX端点未经身份验证即可访问，且未经验证即传递用户提供的参数，可能导致未经身份验证的攻击者在多站点安装中
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)
Affected Products
| Vendor | Product | Affected Versions | CPE | Subscribe |
|---|---|---|---|---|
| joedolson | my-calendar | < 3.7.7 | - |
II. Public POCs for CVE-2026-40308
| # | POC Description | Source Link | Shenlong Link |
|---|---|---|---|
| 1 | My Calendar WordPress plugin <= 3.7.6 contains an injection vulnerability caused by unvalidated user input passed to parse_str() in mc_ajax_mcjs_action endpoint, letting unauthenticated attackers access or crash sites via switch_to_blog(), exploit requires WordPress Multisite or Single Site setup. | https://github.com/projectdiscovery/nuclei-templates/blob/main/http/cves/2026/CVE-2026-40308.yaml | POC Details |
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Same weakness: CWE-639
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