CVE-2021-24927— My Calendar < 3.2.18 - Subscriber+ Reflected Cross-Site Scripting
Quick assessment
Affected
Unknown My Calendar
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.
WordPress是Wordpress基金会的一套使用PHP语言开发的博客平台。该平台支持在PHP和MySQL的服务器上架设个人博客网站。WordPress 插件是WordPress开源的一个应用插件。 WordPress plugin 存在跨站脚本漏洞，该漏洞源于 My Calendar 在将 mc_post_lookup AJAX 操作（任何经过身份验证的用户都可用）的回调参数输出回响应之前，不会对其进行清理和转义，从而导致反射跨站点脚本问题。
Possible ATT&CK Techniques 2 AI
T1189 · Drive-by Compromise T1059 · Command and Scripting Interpreter
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I. Basic Information for CVE-2021-24927
Vulnerability Information
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Vulnerability Title
My Calendar < 3.2.18 - Subscriber+ Reflected Cross-Site Scripting
Source: CVE Program / CVE List V5
Vulnerability Description
The My Calendar WordPress plugin before 3.2.18 does not sanitise and escape the callback parameter of the mc_post_lookup AJAX action (available to any authenticated user) before outputting it back in the response, leading to a Reflected Cross-Site Scripting issue
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
在Web页面生成时对输入的转义处理不恰当(跨站脚本)
Source: CVE Program / CVE List V5
Vulnerability Title
WordPress 插件跨站脚本漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
WordPress是Wordpress基金会的一套使用PHP语言开发的博客平台。该平台支持在PHP和MySQL的服务器上架设个人博客网站。WordPress 插件是WordPress开源的一个应用插件。 WordPress plugin 存在跨站脚本漏洞，该漏洞源于 My Calendar 在将 mc_post_lookup AJAX 操作（任何经过身份验证的用户都可用）的回调参数输出回响应之前，不会对其进行清理和转义，从而导致反射跨站点脚本问题。
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 |
|---|---|---|---|---|
| Unknown | My Calendar | 3.2.18 ~ 3.2.18 | - |
|
II. Public POCs for CVE-2021-24927
| # | POC Description | Source Link | Shenlong Link |
|---|
AI-Generated POC
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Vendor Advisories for CVE-2021-24927 (1)
Same Patch Batch · Unknown · 2021-11-29 · 19 CVEs total
| CVE-2021-24822 | Stylish Cost Calculator < 7.04 - Subscriber+ Unauthorised AJAX Calls to Stored XSS | |
| CVE-2017-20008 | myCRED < 1.7.8 - Reflected Cross-Site Scripting | |
| CVE-2021-24745 | About Author Box < 1.0.2 - Contributor+ Stored Cross-Site Scripting | |
| CVE-2021-24748 | Email Before Download < 6.8 - Admin+ SQL Injection | |
| CVE-2021-24749 | URL Shortify < 1.5.1 - Arbitrary Link/Group Deletion via CSRF | |
| CVE-2021-24751 | GenerateBlocks < 1.4.0 - Contributor+ Stored Cross-Site Scripting | |
| CVE-2021-24755 | myCred < 2.3 - Subscriber+ SQL Injection | |
| CVE-2021-24768 | WP RSS Aggregator < 4.19.2 - Admin+ Stored Cross-Site Scripting | |
| CVE-2021-24811 | Shop Page WP < 1.2.8 - Admin+ Stored Cross-Site Scripting | |
| CVE-2021-24918 | Smash Balloon Social Post Feed < 4.0.1 - Subscriber+ Arbitrary Plugin Settings Update to S | |
| CVE-2021-24842 | Bulk Datetime Change < 1.12 - Missing Authorisation | |
| CVE-2021-24860 | BSK PDF Manager < 3.1.2 - Admin+ SQL Injection | |
| CVE-2021-24876 | Registrations for The Events Calendar < 2.7.5 - Reflected Cross-Site Scripting | |
| CVE-2021-24883 | Popup Anything < 2.0.4 - Contributor+ Stored Cross-Site Scripting | |
| CVE-2021-24889 | Ninja Forms < 3.6.4 - Admin+ SQL Injection | |
| CVE-2021-24899 | Media-Tags <= 3.2.0.2 - Admin+ Stored Cross-Site Scripting | |
| CVE-2021-24908 | Check & Log Email < 1.0.4 - Reflected Cross-Site Scripting | |
| CVE-2021-24915 | Contest Gallery < 13.1.0.6 - Missing Access Controls to Unauthenticated SQL injection / Em |
IV. Related Vulnerabilities
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WordPress My Calendar Plugin <= 3.3.24.1 is vulnerable to Cr
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V. Comments for CVE-2021-24927
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