croixhaug Simply Schedule Appointments Plugin up to 1.6.12.10 on WordPress Render Shortcode render-shortcode ssa_past_appointments information disclosure

Summaryinfo

A vulnerability was found in croixhaug Simply Schedule Appointments Plugin up to 1.6.12.10. It has been classified as problematic. This impacts an unknown function of the file /wp-json/ssa/v1/render-shortcode of the component Render Shortcode. This manipulation of the argument ssa_past_appointments causes information disclosure. This vulnerability is handled as CVE-2026-13358. The attack can be initiated remotely. There is not any exploit available.

Detailsinfo

A vulnerability has been found in croixhaug Simply Schedule Appointments Plugin up to 1.6.12.10 and classified as problematic. Affected by this vulnerability is an unknown code block of the file /wp-json/ssa/v1/render-shortcode of the component Render Shortcode. The manipulation of the argument ssa_past_appointments with an unknown input leads to a information disclosure vulnerability. The CWE definition for the vulnerability is CWE-200. The product exposes sensitive information to an actor that is not explicitly authorized to have access to that information. As an impact it is known to affect confidentiality. The summary by CVE is:

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.

The advisory is shared at wordfence.com. This vulnerability is known as CVE-2026-13358 since 06/25/2026. The exploitation appears to be easy. The attack can be launched remotely. Technical details are known, but no exploit is available. MITRE ATT&CK project uses the attack technique T1592 for this issue.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

Productinfo

Type

• WordPress Plugin

Vendor

• croixhaug

Name

• Simply Schedule Appointments Plugin

Version

• 1.6.12.0
• 1.6.12.1
• 1.6.12.2
• 1.6.12.3
• 1.6.12.4
• 1.6.12.5
• 1.6.12.6
• 1.6.12.7
• 1.6.12.8
• 1.6.12.9
• 1.6.12.10

CPE 2.3info

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CPE 2.2info

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Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

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