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CVE-2026-77186— My Calendar <= 3.8.3 - Authenticated (Contributor+) Stored Cross-Site Scripting via 'fallback' Shortcode Attribute

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 My Calendar是WordPress基金会的一款整合日程安排、事件提醒与资源调度管理的企业资源计划系统。 WordPress My Calendar 3.8.3及之前版本存在跨站脚本漏洞，该漏洞源于对fallback短代码属性的输入清理和输出转义不足，可能导致具有贡献者级别及以上权限的认证用户注入任意Web脚本，造成存储型跨站脚本攻击。

CVSS 6.4 · Medium EPSS 0.36% · P29

Affected Version Matrix 1

VendorProduct Version RangeStatus
joedolson My Calendar – Accessible Event Manager ≤ 3.8.3 affected
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I. Basic Information for CVE-2026-77186

Vulnerability Information
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Vulnerability Title
My Calendar <= 3.8.3 - Authenticated (Contributor+) Stored Cross-Site Scripting via 'fallback' Shortcode Attribute
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 'fallback' Shortcode Attribute 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. The bypass relies on hex-encoded shortcode attribute payloads (e.g. \x3cscript\x3e), which wp_kses_post cannot strip on save because they appear as literal backslash sequences rather than real HTML tags; WordPress core's shortcode_parse_atts() then calls stripcslashes() at render time, decoding the escapes into real angle brackets before they reach the unescaped sink.
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
Vulnerability Title
WordPress My Calendar 跨站脚本漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
WordPress My Calendar是WordPress基金会的一款整合日程安排、事件提醒与资源调度管理的企业资源计划系统。 WordPress My Calendar 3.8.3及之前版本存在跨站脚本漏洞，该漏洞源于对fallback短代码属性的输入清理和输出转义不足，可能导致具有贡献者级别及以上权限的认证用户注入任意Web脚本，造成存储型跨站脚本攻击。
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 – Accessible Event Manager 0 ~ 3.8.3 -

II. Public POCs for CVE-2026-77186

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III. Intelligence Information for CVE-2026-77186

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Patches & Fixes for CVE-2026-77186 (1)

Vendor Advisories for CVE-2026-77186 (1)

Vendor Pages for CVE-2026-77186 (1)

IV. Related Vulnerabilities

Same product: My Calendar – Accessible Event Manager
Same vendor: joedolson
Same weakness: CWE-79