EUVD-2026-49072
GHSA-v365-26q9-f844
Vulnerability Assessment
| Weakness |
CWE
MITRE ATT&CK
2 techniques across 2 tactics: Initial Access, Execution The technique list with ATT&CK links and the kill-chain view is part of the Basic plan and up. |
Get an e-mail when this CVE is exploited, patched or re-scored. Free account.
Alert meAnalysisAIv1 – Jul 27, 2026
Stored Cross-Site Scripting in Simply Schedule Appointments up to 1.6.12.2 allows unauthenticated attackers to inject arbitrary web scripts. A double‑encoding fault causes payloads to bypass the plugin’s wp_kses_post() sanitizer and then execute when an administrator views appointment notifications. The vulnerability is fixed in version 1.6.12.4; a public proof‑of‑concept exists but no active exploitation has been confirmed.
Affected VersionsENISA
Affected Packages
Source: OSV (Open Source Vulnerabilities)
Affects your stack
Affects 1 package in euvd
Checking this CVE against your own stacks and servers is part of the Basic plan and up.
Know when Simply Schedule Appointments gets its next vulnerability
- Watch products and get an email when something new is published
- Check this CVE against your own stack and servers
- Exploit and PoC references, threat intelligence from 22 sources
No credit card · 7-day full trial
Severity by source
AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
Primary rating from Vendor (WPScan) · only source for this CVE.
CVSS VectorVendor: WPScan
Lifecycle Timeline
3DescriptionCVE.org
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.
Threat Intelligence Overview
NVD
CVE.org
EPSS
Vulnrichment
How this decision was reached
The engine reads each signal below and applies a fixed list of rules from top to bottom. The first rule that matches sets the recommended action – like a statement, every line is shown.
What every action level means
SSVC AssessmentENISA
Priority Score
Attack Technique
Cross-Site Scripting occurs when an application accepts untrusted data and sends it to a web browser without proper validation or encoding.
More in Simply Schedule Appointments
View allSimply Schedule Appointments WordPress plugin before 1.6.12.6 exposes all site appointment records to unauthenticated us
The Appointment Booking Calendar WordPress plugin before 1.6.7.43 does not escape template syntax provided via user inpu
Broken access control in Simply Schedule Appointments WordPress plugin before 1.6.12.11 exposes all customer appointment
Unauthenticated SQL injection in the Simply Schedule Appointments WordPress plugin (versions ≤ 1.6.9.27) allows remote a
Unauthenticated SQL injection in the Simply Schedule Appointments WordPress plugin (versions up to and including 1.6.12.
The Simply Schedule Appointments WordPress plugin before 1.5.7.7 is missing authorisation in a REST endpoint, allowing u
The Appointment Booking Calendar - Simply Schedule Appointments Booking Plugin plugin for WordPress is vulnerable to SQL
The Appointment Booking Calendar - Simply Schedule Appointments Booking Plugin plugin for WordPress is vulnerable to SQL
Cross-site request forgery in the Simply Schedule Appointments WordPress plugin (versions ≤ 1.6.12.23) enables an unauth
The Appointment Booking Calendar - Simply Schedule Appointments Booking Plugin WordPress plugin before 1.6.7.55 does not
The Appointment Booking Calendar - Simply Schedule Appointments Booking Plugin WordPress plugin before 1.6.7.55 does not
The Simply Schedule Appointments WordPress plugin before 1.5.7.7 does not sanitise and escape some of its settings, whic
Exploit-DB