CVE-2026-13400

MediumCVSS 6.1/10Last modified Jul 27, 2026

Description

Simply Schedule Appointments is vulnerable to unauthenticated Stored Cross-Site Scripting in all versions up to and including 1.6.12.2. The root cause is a sanitization-ordering defect: the rendered notification content is decoded back into live HTML after it has already passed through the Simply Schedule Appointments WordPress plugin before 1.6.12.4's wp_kses_post() filter, so a double-encoded payload survives intake and is reintroduced as an executable element at render time.

Metrics

CVSS 3.1 6.1/10CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

Weakness enumeration

CWE-79

Affected software

No affected versions have been published.

Timeline

Published
Jul 27, 2026
Last modified
Jul 27, 2026
NVD status
Deferred

Related CVEs from 2026

CVE-2026-134017.5XML::Bare versions through 0.53 for Perl will hang in an infinite loop when parsing malformed attributes. The parserc_parse function never CVE-2026-134025.3The Royal Addons for Elementor WordPress plugin before 1.7.1063 does not check the post status of menu items or the templates they referencCVE-2026-134045.3The Royal Addons for Elementor WordPress plugin before 1.7.1066 does not perform any capability or ownership check (relying only on a publiCVE-2026-134056.6The Royal Addons for Elementor WordPress plugin before 1.7.1066 does not correctly sanitise custom widget markup before writing it to a filCVE-2026-134065.3The Royal Addons for Elementor WordPress plugin before 1.7.1066 does not perform any capability or nonce check before returning taxonomy teCVE-2026-134075.4The Royal Elementor Addons WordPress plugin before 1.7.1067 does not properly sanitize and escape values submitted through its form widget bCVE-2026-13419.3Avation Light Engine Pro exposes its configuration and control interface without any authentication or access control.CVE-2026-134108.2Dancer::Plugin::Auth::Google versions before 0.08 for Perl have TLS verification disabled. The default user agent is initialised with SSL_vCVE-2026-134114.3Mattermost versions 11.7.x <= 11.7.11 fail to validate null elements when decoding playbook import conditions which allows an authenticated CVE-2026-134135.3The CMP – Coming Soon & Maintenance WordPress plugin before 4.1.20 does not correctly restrict access to the site while maintenance/coming-sCVE-2026-134144.8The CMP WordPress plugin before 4.1.18 does not perform authorization checks on one of its AJAX actions and relies on a nonce that is skippCVE-2026-134157.2The CMP WordPress plugin before 4.1.18 does not enforce an option-name allow-list when importing settings via one of its AJAX actions, allo
CVE-2026-13400: Medium severity, CVSS 6.1 | Vulnix