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CVE-2026-111727— Appointment Booking Calendar <= 1.4.05 - Authenticated (Subscriber+) Stored Cross-Site Scripting via 'vs_text_submitbtn' Parameter

Quick assessment

Affected
codepeople Appointment Booking 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 的"Appointment Booking Calendar"插件存在存储型跨站脚本（Stored XSS）漏洞。该漏洞影响所有 1.4.05 及更早版本，原因是输入数据未充分清理且输出时未进行转义。漏洞通过 参数触发，使得拥有“订阅者”（Subscriber）权限或更高权限的已认证攻击者，能够在页面中注入任意 Web 脚本；一旦用户访问被注入的页面，这些脚本便会执行。 利用该漏洞需要攻击者账户被指定为某个日历的“所有者”（owner）。该权限可通过插件的日历列表界面由管理员授予，且授予对象可低

CVSS 6.4 · Medium
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I. Basic Information for CVE-2026-111727

Vulnerability Information
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Vulnerability Title
Appointment Booking Calendar <= 1.4.05 - Authenticated (Subscriber+) Stored Cross-Site Scripting via 'vs_text_submitbtn' Parameter
Source: CVE Program / CVE List V5
Vulnerability Description
The Appointment Booking Calendar plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the 'vs_text_submitbtn' parameter in all versions up to, and including, 1.4.05 due to insufficient input sanitization and output escaping. This makes it possible for authenticated attackers, with subscriber-level access and above, to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page. This requires the attacker to be assigned as a calendar owner, a per-user grant that any administrator can extend to users as low as Subscriber level through the plugin's calendar list screen. Exploitation by attackers with subscriber-level access and above requires that an administrator has assigned the attacker's account as owner (`conwer`) of a calendar via the plugin's calendar list screen; the plugin's UI lists all registered users regardless of role, so a Subscriber can be assigned. On a default installation, where that is not configured, the vulnerability requires attackers with editor-level access and above.
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
codepeople Appointment Booking Calendar 0 ~ 1.4.05 -

II. Public POCs for CVE-2026-111727

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III. Intelligence Information for CVE-2026-111727

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Other References for CVE-2026-111727 (8)

IV. Related Vulnerabilities

Same product: Appointment Booking Calendar
Same vendor: codepeople
Same weakness: CWE-79