CVE-2026-89294
Received Received - Intake

Local File Inclusion in Simply Schedule Appointments WordPress Plugin

Publication date: 2026-09-30

Last updated on: 2026-09-30

Assigner: Wordfence

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.

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Meta Information

Published
2026-09-30
Last Modified
2026-09-30
Generated
2026-09-30
AI Q&A
2026-09-30
EPSS Evaluated
N/A
NVD
CVE-2026-89294
EUVD
EUVD-2026-89654

Affected Vendors & Products

Showing 1 associated CPE
Vendor Product Version / Range
simply_schedule_appointments simply_schedule_appointments to 1.6.12.27 (inc)

Helpful Resources

Exploitability

CWE
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KEV
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CWE ID Description
CWE-98 The PHP application receives input from an upstream component, but it does not restrict or incorrectly restricts the input before its usage in "require," "include," or similar functions.

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Executive Summary

The Simply Schedule Appointments WordPress plugin has a Local File Inclusion vulnerability in versions up to 1.6.12.27. The flaw exists in the 'ssa_locale' parameter, which allows authenticated attackers with subscriber-level access to include and execute arbitrary PHP files on the server. This can lead to code execution, bypassing access controls, or stealing sensitive data.

Detection Guidance

Check WordPress installations for the Simply Schedule Appointments plugin versions up to 1.6.12.27. Look for unauthorized PHP file inclusions via the 'ssa_locale' parameter in server logs. Use commands like 'grep -r ssa_locale /var/log/' to search for suspicious activity.

Impact Analysis

An attacker could exploit this to run malicious PHP code on your server, steal sensitive data, or gain unauthorized access. Even without authentication, exploitation is possible due to the plugin's design flaw in handling the locale parameter.

Compliance Impact

This vulnerability could lead to unauthorized data access or exfiltration, violating GDPR (data protection) and HIPAA (health data privacy) requirements. Organizations using this plugin may face compliance breaches, legal penalties, and reputational damage if exploited.

Mitigation Strategies

Update the Simply Schedule Appointments plugin to the latest version immediately. Remove or disable the plugin if updates are unavailable. Restrict file upload permissions and monitor for unauthorized PHP file executions.

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