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CVE-2026-91109— Simply Schedule Appointments <= 1.6.12.31 - Insecure Direct Object Reference to Authenticated (Subscriber+) Sensitive Information Disclosure via 'complete_group' Parameter

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 插件在包括 1.6.12.31 在内的所有版本中均存在不安全的直接对象引用（IDOR）漏洞。该漏洞源于对由用户控制的键值缺少验证，具体通过 参数触发。 这使得拥有订阅者（subscriber）级别或更高权限的已认证攻击者能够泄露同一预约组中每位共同预订者的私有 （以 形式暴露）及其个人身份信息（PII，包括姓名和电子邮件地址）。随后，攻击者可利用每个泄露的令牌，通过相同的 REST 控制器读取、覆盖任意预约元数据（appointmen

CVSS 6.5 · Medium

Possible ATT&CK Techniques 1 AI

T1592 · Gather Victim Host Information
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I. Basic Information for CVE-2026-91109

Vulnerability Information
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Vulnerability Title
Simply Schedule Appointments <= 1.6.12.31 - Insecure Direct Object Reference to Authenticated (Subscriber+) Sensitive Information Disclosure via 'complete_group' Parameter
Source: CVE Program / CVE List V5
Vulnerability Description
The Simply Schedule Appointments plugin for WordPress is vulnerable to Insecure Direct Object Reference in all versions up to, and including, 1.6.12.31 via the 'complete_group' parameter due to missing validation on a user controlled key. This makes it possible for authenticated attackers, with subscriber-level access and above, to disclose every co-booker's private per-appointment id_token (exposed as public_token) alongside their PII (name and email address), then use each leaked token to read, overwrite arbitrary appointment meta on, or cancel the co-booker's appointment via the same REST controller. Exploitation requires the attacker to possess a valid id_token for any single appointment within the targeted group booking.
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

Affected Products

Vendor Product Affected Versions CPE Subscribe
croixhaug Simply Schedule Appointments 0 ~ 1.6.12.31 -

II. Public POCs for CVE-2026-91109

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III. Intelligence Information for CVE-2026-91109

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Patches & Fixes for CVE-2026-91109 (1)

Vendor Advisories for CVE-2026-91109 (1)

Other References for CVE-2026-91109 (3)

Other References for CVE-2026-91109 (1)

IV. Related Vulnerabilities

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

V. Comments for CVE-2026-91109

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