CVE-2026-77187— My Calendar <= 3.8.3 - Authenticated (Contributor+) Stored Cross-Site Scripting via 'before' and 'after' Shortcode Attributes
Quick assessment
Affected
joedolson My Calendar – Accessible Event Manager
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 的“My Calendar – Accessible Event Manager”插件存在存储型跨站脚本（Stored Cross-Site Scripting, XSS）漏洞。该漏洞源于对 和 短代码（Shortcode）属性的输入清洗（sanitization）不足以及输出转义（escaping）缺失。该漏洞存在于所有版本，包括 3.8.3 及更早的版本。这意味着拥有贡献者（contributor）级别或更高权限的已认证攻击者，可以注入任意 Web 脚本，这些脚本将在用户访问被注入的页面时执
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I. Basic Information for CVE-2026-77187
Vulnerability Information
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Vulnerability Title
My Calendar <= 3.8.3 - Authenticated (Contributor+) Stored Cross-Site Scripting via 'before' and 'after' Shortcode Attributes
Source: CVE Program / CVE List V5
Vulnerability Description
The My Calendar – Accessible Event Manager plugin for WordPress is vulnerable to Stored Cross-Site Scripting via 'before' and 'after' Shortcode Attributes in all versions up to, and including, 3.8.3 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N
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
Affected Products
| Vendor | Product | Affected Versions | CPE | Subscribe |
|---|---|---|---|---|
| joedolson | My Calendar – Accessible Event Manager | 0 ~ 3.8.3 | - |
|
II. Public POCs for CVE-2026-77187
| # | POC Description | Source Link | Shenlong Link |
|---|
AI-Generated POC
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Other References for CVE-2026-77187 (3)
IV. Related Vulnerabilities
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V. Comments for CVE-2026-77187
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