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CVE-2026-89294— Simply Schedule Appointments <= 1.6.12.27 - Authenticated (Subscriber+) Local File Inclusion via 'ssa_locale' 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 插件在所有版本（包括 1.6.12.27 及之前）中存在本地文件包含（Local File Inclusion, LFI）漏洞，该漏洞通过 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包含并执行服务器上的任意 文件，从而执行这些文件中包含的任意 PHP 代码。该漏洞可被用于绕过访问控制、获取敏感数据，或在允许上传并包含 文件类型的情况下实现代码执行。值得注意的是，在实际利用中该漏洞无需身份验证即可

CVSS 7.5 · High

Possible ATT&CK Techniques 1 AI

T1505.003 · Web Shell
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I. Basic Information for CVE-2026-89294

Vulnerability Information
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Vulnerability Title
Simply Schedule Appointments <= 1.6.12.27 - Authenticated (Subscriber+) Local File Inclusion via 'ssa_locale' Parameter
Source: CVE Program / CVE List V5
Vulnerability Description
The Simply Schedule Appointments plugin for WordPress is vulnerable to Local File Inclusion in all versions up to, and including, 1.6.12.27 via the 'ssa_locale' parameter parameter. This makes it possible for authenticated attackers, with subscriber-level access and above, to include and execute arbitrary .php files on the server, allowing the execution of any PHP code in those files. This can be used to bypass access controls, obtain sensitive data, or achieve code execution in cases where .php file types can be uploaded and included. Notably, exploitation does not require authentication in practice, as the locale filter is installed unconditionally on every request during plugins_loaded and the callback performs no nonce or capability check before returning the raw GET parameter value.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
PHP程序中Include/Require语句包含文件控制不恰当(PHP远程文件包含)
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
croixhaug Simply Schedule Appointments 0 ~ 1.6.12.27 -

II. Public POCs for CVE-2026-89294

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III. Intelligence Information for CVE-2026-89294

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Vendor Advisories for CVE-2026-89294 (1)

Other References for CVE-2026-89294 (3)

IV. Related Vulnerabilities

Same product: Simply Schedule Appointments
Same vendor: croixhaug
Same weakness: CWE-98

V. Comments for CVE-2026-89294

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