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CVE-2026-104000— Simply Schedule Appointments <= 1.6.12.35 - Unauthenticated Stored Cross-Site Scripting via 'status' Parameter via /wp-json/ssa/v1/appointments/{id}

Quick assessment

Affected
croixhaug Simply Schedule Appointments
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"Simply Schedule Appointments"插件在所有 1.6.12.35 及更早版本中，由于输入清理和输出转义不足，存在通过"status"参数触发的存储型跨站脚本（Stored XSS）漏洞。该漏洞允许未认证的攻击者在页面中注入任意 Web 脚本，当用户访问被注入的页面时，这些脚本将被执行。 由于调试日志功能默认开启，且调试日志查看器对任何持有站点级支持 PIN（即显示在 wp-admin 中的 AUTH_SALT 的 HMAC-MD5 值）的用户开放，恶意载荷会被无条件存

CVSS 7.2 · High EPSS 0.24% · P14

Affected Version Matrix 1

VendorProduct Version RangeStatus
croixhaug Simply Schedule Appointments ≤ 1.6.12.35 affected
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I. Basic Information for CVE-2026-104000

Vulnerability Information
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Vulnerability Title
Simply Schedule Appointments <= 1.6.12.35 - Unauthenticated Stored Cross-Site Scripting via 'status' Parameter via /wp-json/ssa/v1/appointments/{id}
Source: CVE Program / CVE List V5
Vulnerability Description
The Simply Schedule Appointments plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the 'status' parameter in all versions up to, and including, 1.6.12.35 due to insufficient input sanitization and output escaping. This makes it possible for unauthenticated attackers to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page. The malicious payload is stored unconditionally because debug logging is enabled by default, and the debug-log viewer is accessible to anyone holding the site-wide Support PIN (an HMAC-MD5 of AUTH_SALT displayed in wp-admin), meaning the injected script will execute against the administrator's session during ordinary support or troubleshooting workflows.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/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
croixhaug Simply Schedule Appointments 0 ~ 1.6.12.35 -

II. Public POCs for CVE-2026-104000

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III. Intelligence Information for CVE-2026-104000

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Patches & Fixes for CVE-2026-104000 (1)

Vendor Advisories for CVE-2026-104000 (1)

Other References for CVE-2026-104000 (1)

IV. Related Vulnerabilities

Same product: Simply Schedule Appointments
Same vendor: croixhaug
Same weakness: CWE-79

V. Comments for CVE-2026-104000

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