{"id":"CVE-2026-13400","aliases":["EUVD-2026-49072","GHSA-v365-26q9-f844"],"status":"published","title":"Simply Schedule Appointments \u003c 1.6.12.4 - Unauthenticated Stored XSS via Booking Customer Information","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.","severity":{"version":"3.1","score":6.1,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N","level":"medium","assessor":"adp","from":"cve"},"epss":{"day":"2026-11-11","score":0.00253,"percentile":0.1693,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-79"],"published":"2026-07-27T06:00:03Z","modified":"2026-07-27T20:33:01Z","products":[{"vendor":"nsquared","product":"simply schedule appointments"},{"vendor":"unknown","product":"simply schedule appointments"}],"references":[{"url":"https://wpscan.com/vulnerability/501b2929-3216-4587-8124-088fd51becf1/","tags":["exploit","vdb-entry","technical-description"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-13400"},{"url":"https://wpscan.com/vulnerability/501b2929-3216-4587-8124-088fd51becf1"},{"url":"https://github.com/advisories/GHSA-v365-26q9-f844"}],"sources":{"cve":[{"id":"CVE-2026-13400","title":"Simply Schedule Appointments \u003c 1.6.12.4 - Unauthenticated Stored XSS via Booking Customer Information","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.","status":"published","published":"2026-07-27T06:00:03.496Z","modified":"2026-07-27T13:53:58.533Z","cvss":[{"version":"3.1","score":6.1,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N","level":"medium","assessor":"adp"}],"cwes":["CWE-79"],"updated_at":"2026-11-02T14:19:49.885652Z"}],"euvd":[{"id":"EUVD-2026-49072","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.","status":"published","published":"2026-07-27T06:00:03Z","modified":"2026-07-27T13:53:58Z","cvss":[{"version":"3.1","score":6.1,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N","level":"medium"}],"updated_at":"2026-11-02T18:19:37.322622Z"}],"ghsa":[{"id":"GHSA-v365-26q9-f844","title":"Simply Schedule Appointments is vulnerable to unauthenticated Stored Cross-Site Scripting in all...","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.","status":"published","published":"2026-07-27T09:31:25Z","modified":"2026-07-27T15:33:35Z","cvss":[{"version":"3.1","score":6.1,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N","level":"medium"}],"cwes":["CWE-79"],"updated_at":"2026-11-02T15:09:50.782117Z"}],"nvd":[{"id":"CVE-2026-13400","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.","status":"published","published":"2026-07-27T07:16:25.023Z","modified":"2026-07-27T20:33:01.673Z","cvss":[{"version":"3.1","score":6.1,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N","level":"medium","assessor":"secondary"}],"cwes":["CWE-79"],"updated_at":"2026-11-02T14:12:32.830533Z"}]}}