CVE-2025-69315: Simply Schedule Appointments Auth Bypass

CVE-2025-69315 Overview

CVE-2025-69315 is a missing authorization vulnerability in the NSquared Simply Schedule Appointments WordPress plugin. The flaw affects all versions up to and including 1.6.9.15 and stems from incorrectly configured access control security levels [CWE-862]. Unauthenticated attackers can reach protected functionality over the network without user interaction. The vulnerability carries a CVSS 3.1 base score of 6.5, with impact limited to confidentiality and integrity. No public proof-of-concept exploit is currently available, and the issue is not listed on the CISA Known Exploited Vulnerabilities catalog.

Critical Impact
Unauthenticated network attackers can bypass access controls in Simply Schedule Appointments to read or modify appointment data on affected WordPress sites.

Affected Products

NSquared Simply Schedule Appointments plugin for WordPress
All versions from initial release through 1.6.9.15
WordPress sites with the vulnerable plugin activated

Discovery Timeline

2026-01-22 - CVE-2025-69315 published to NVD
2026-06-17 - Last updated in NVD database

Technical Details for CVE-2025-69315

Vulnerability Analysis

The vulnerability resides in the Simply Schedule Appointments plugin's access control layer. The plugin exposes functionality that fails to validate whether the requesting user holds the required capability or role. As a result, unauthenticated requests can reach operations that should be restricted to privileged accounts.

The issue is classified under [CWE-862] Missing Authorization. The plugin defines security levels for its endpoints but configures them incorrectly, allowing attackers to interact with resources outside their intended permission scope. Impact is scoped to low confidentiality and low integrity loss, with no direct effect on availability.

Because Simply Schedule Appointments manages booking data, exposed endpoints may reveal customer appointment details, contact information, or schedule configuration. Attackers may also modify appointment records depending on which endpoints lack proper authorization checks.

Root Cause

The root cause is improper enforcement of capability checks on plugin actions. Access control security levels are declared but not consistently applied at the request handler layer. WordPress plugins typically enforce authorization through current_user_can() checks and nonce validation. When these gates are missing or misconfigured, REST or AJAX endpoints become reachable by any network client.

Attack Vector

Exploitation requires only network access to the target WordPress site. An attacker sends crafted HTTP requests to the plugin's endpoints without authentication or valid session tokens. No user interaction is required, and attack complexity is low. Refer to the Patchstack Vulnerability Advisory for endpoint-level technical details.

Detection Methods for CVE-2025-69315

Indicators of Compromise

Unexpected HTTP requests to Simply Schedule Appointments REST or AJAX endpoints from unauthenticated sources
Unusual read or write activity against appointment records in the WordPress database
Access log entries hitting plugin endpoints without prior authentication cookies or nonces

Detection Strategies

Inventory WordPress installations and identify sites running Simply Schedule Appointments version 1.6.9.15 or earlier
Review web server access logs for requests to plugin routes originating from unauthenticated sessions
Correlate spikes in plugin endpoint traffic with database changes to appointment tables

Monitoring Recommendations

Enable WordPress audit logging for plugin-level actions and REST API calls
Alert on high-frequency requests to /wp-json/ routes associated with the plugin
Monitor outbound data volume from WordPress hosts to identify possible data harvesting

How to Mitigate CVE-2025-69315

Immediate Actions Required

Update Simply Schedule Appointments to a version later than 1.6.9.15 as soon as a patched release is available from NSquared
Restrict administrative and REST API access to WordPress sites using network or application firewall rules
Audit appointment data for signs of unauthorized read or modification activity

Patch Information

Consult the Patchstack Vulnerability Advisory for the fixed version and vendor guidance. Apply the vendor-supplied update through the WordPress plugin management interface and validate that the plugin reports a version higher than 1.6.9.15 after update.

Workarounds

Deactivate the Simply Schedule Appointments plugin until a fixed version can be deployed
Deploy a web application firewall rule that blocks unauthenticated requests to the plugin's REST and AJAX endpoints
Limit access to WordPress admin and API paths by source IP where feasible

bash

# Example: block unauthenticated access to plugin endpoints at the web server layer
# nginx snippet - adjust route patterns to match Simply Schedule Appointments endpoints
location ~* /wp-json/ssa/ {
    if ($http_cookie !~* "wordpress_logged_in") {
        return 403;
    }
}