CVE-2026-13400
Simply Schedule Appointments < 1.6.12.4 - Unauthenticated Stored XSS via Booking Customer Information
CVSS Score
0.0
EPSS Score
0.0%
EPSS Percentile
0th
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.
| Vendor | unknown |
| Product | simply schedule appointments |
| Published | Jul 27, 2026 |
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Affected Versions
Unknown / Simply Schedule Appointments
0 < 1.6.12.4
References
Credits
Revanth Hari Narayana Matte WPScan