{"id":"CVE-2026-91109","revision":null,"records":[{"revision":"87944c168bea4adfa157bf1865ee78c8","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-91109","aliases":[],"title":"Simply Schedule Appointments <= 1.6.12.31 - Insecure Direct Object Reference to Authenticated (Subscriber+) Sensitive Information Disclosure via 'complete_group' Parameter","description":"The Simply Schedule Appointments plugin for WordPress is vulnerable to Insecure Direct Object Reference in all versions up to, and including, 1.6.12.31 via the 'complete_group' parameter due to missing validation on a user controlled key. This makes it possible for authenticated attackers, with subscriber-level access and above, to disclose every co-booker's private per-appointment id_token (exposed as public_token) alongside their PII (name and email address), then use each leaked token to read, overwrite arbitrary appointment meta on, or cancel the co-booker's appointment via the same REST controller. Exploitation requires the attacker to possess a valid id_token for any single appointment within the targeted group booking.","state":0,"publishedAt":"2026-10-01T03:28:22.807+00:00","modifiedAt":"2026-10-03T15:42:53.139+00:00","affected":[{"ecosystem":"Vendor product","name":"Simply Schedule Appointments","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"vendor\": \"croixhaug\",\n                    \"product\": \"Simply Schedule Appointments\",\n                    \"versions\": [\n                        {\n                            \"version\": \"0\",\n                            \"status\": \"affected\",\n                            \"lessThanOrEqual\": \"1.6.12.31\",\n                            \"versionType\": \"semver\"\n                        }\n                    ],\n                    \"defaultStatus\": \"unaffected\"\n                }"}],"metrics":[{"system":"CVSS 3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N","score":6.5,"severity":"MEDIUM"}],"references":["https://www.wordfence.com/threat-intel/vulnerabilities/id/d1cd3de2-16ca-4f95-ad6f-47cfbe00c959?source=cve","https://plugins.trac.wordpress.org/browser/simply-schedule-appointments/tags/1.6.12.27/includes/class-appointment-model.php#L3160","https://plugins.trac.wordpress.org/browser/simply-schedule-appointments/tags/1.6.12.27/includes/class-appointment-model.php#L1966","https://plugins.trac.wordpress.org/browser/simply-schedule-appointments/tags/1.6.12.27/includes/class-appointment-model.php#L2315","https://plugins.trac.wordpress.org/browser/simply-schedule-appointments/tags/1.6.12.27/includes/class-db-model.php#L348","https://plugins.trac.wordpress.org/changeset/3709365/simply-schedule-appointments/trunk/includes/class-appointment-model.php"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-91109","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-91109","identifiers":["CVE-2026-91109"]},"retained":false,"historicalAffected":[]}],"coverage":[{"source":"cisa-kev:global","scope":"Complete CISA KEV catalog; all vendors. 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Not a global EUVD catalog. Successful not-found lookups count as checked; they do not imply withdrawal or safety. No reader inventory is sent.","generation":"enrichment-8e2a34a18d694453aff340dede947f74","complete":false,"records":13759,"lastAttemptAt":"2026-11-11T18:10:43.0838006+00:00","lastSuccessAt":"2026-11-11T18:10:43.078+00:00","error":null,"lastVerifiedAt":"2026-11-11T18:10:43.078+00:00","snapshotPublishedAt":null,"importing":false,"stagedRecords":0,"checkedIdentifiers":13584,"expectedIdentifiers":13813,"failedIdentifiers":0},{"source":"first-epss:nuget","scope":"FIRST EPSS for explicit CVE aliases in the collected public NuGet archive. Not a global EPSS backfill.","generation":"2026-11-11T17:59:29.7133238+00:00","complete":true,"records":1097,"lastAttemptAt":"2026-11-11T17:59:29.7133238+00:00","lastSuccessAt":"2026-11-11T17:59:29.8793973+00:00","error":null,"lastVerifiedAt":"2026-11-11T17:59:29.8793975+00:00","snapshotPublishedAt":null,"importing":false,"stagedRecords":0,"checkedIdentifiers":null,"expectedIdentifiers":null,"failedIdentifiers":null},{"source":"nvd","scope":"Rolling NVD lookups of CVE aliases in current public OSV archives; 500 identifiers per refresh, rechecked after 48 hours. Not a global NVD catalog. Successful not-found lookups count as checked; they do not imply withdrawal or safety. No reader inventory is sent.","generation":"enrichment-9169816ed33d4259981dbb50309d6730","complete":false,"records":13753,"lastAttemptAt":"2026-11-11T18:01:00.7925805+00:00","lastSuccessAt":"2026-11-11T16:59:52.052+00:00","error":"100 identifier lookups failed; latest failures include request timeout. 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