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CVE-2026-13358— Appointment Booking Calendar — Simply Schedule Appointments Booking Plugin <= 1.6.12.10 - Authenticated (Contributor+) Insecure Direct Object Reference to Sensitive Information Exposure

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 Simply Schedule Appointments是WordPress基金会的一款简化预约安排流程的调度插件。 WordPress Simply Schedule Appointments 1.6.12.10及之前版本存在授权问题漏洞，该漏洞源于ssa_past_appointments参数存在不安全的直接对象引用，缺少对用户控制键的验证，可能导致具有贡献者级别及以上权限的已认证攻击者访问任意用户的预约记录并获取预约所有权令牌，进而无需身份验证即可读取或修改预约信息，包括客户姓名

CVSS 6.5 · Medium EPSS 0.68% · P51

Affected Version Matrix 1

VendorProduct Version RangeStatus
croixhaug Simply Schedule Appointments ≤ 1.6.12.10 affected
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I. Basic Information for CVE-2026-13358

Vulnerability Information
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Vulnerability Title
Appointment Booking Calendar — Simply Schedule Appointments Booking Plugin <= 1.6.12.10 - Authenticated (Contributor+) Insecure Direct Object Reference to Sensitive Information Exposure
Source: CVE Program / CVE List V5
Vulnerability Description
The Appointment Booking Calendar — Simply Schedule Appointments Booking Plugin plugin for WordPress is vulnerable to Insecure Direct Object Reference in all versions up to, and including, 1.6.12.10 via the ssa_past_appointments due to missing validation on a user controlled key. This makes it possible for authenticated attackers, with contributor-level access and above, to access appointment records belonging to arbitrary users and harvest the per-appointment ownership tokens (32-character hashes) embedded in the rendered HTML, which can then be used without any authentication to read or modify those appointments including full customer PII such as name, email, phone number, and private notes. The /wp-json/ssa/v1/render-shortcode REST endpoint is registered unconditionally on rest_api_init regardless of whether the Divi theme is installed, and its permission callback only requires current_user_can('edit_posts'), meaning any Contributor-level account is sufficient to trigger this entire exploit chain.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
通过用户控制密钥绕过授权机制
Source: CVE Program / CVE List V5
Vulnerability Title
WordPress Simply Schedule Appointments 授权问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
WordPress Simply Schedule Appointments是WordPress基金会的一款简化预约安排流程的调度插件。 WordPress Simply Schedule Appointments 1.6.12.10及之前版本存在授权问题漏洞，该漏洞源于ssa_past_appointments参数存在不安全的直接对象引用，缺少对用户控制键的验证，可能导致具有贡献者级别及以上权限的已认证攻击者访问任意用户的预约记录并获取预约所有权令牌，进而无需身份验证即可读取或修改预约信息，包括客户姓名
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
croixhaug Simply Schedule Appointments 0 ~ 1.6.12.10 -

II. Public POCs for CVE-2026-13358

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III. Intelligence Information for CVE-2026-13358

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Patches & Fixes for CVE-2026-13358 (4)

Vendor Advisories for CVE-2026-13358 (1)

Vendor Pages for CVE-2026-13358 (1)

IV. Related Vulnerabilities

Same product: Simply Schedule Appointments
Same vendor: croixhaug
Same weakness: CWE-639

V. Comments for CVE-2026-13358

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