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vuln-cve/data/2026/91xxx/CVE-2026-91109.json
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{
"dataType": "CVE_RECORD",
"dataVersion": "5.2",
"cveMetadata": {
"cveId": "CVE-2026-91109",
"assignerOrgId": "b15e7b5b-3da4-40ae-a43c-f7aa60e62599",
"state": "PUBLISHED",
"assignerShortName": "Wordfence",
"dateReserved": "2026-09-14T19:36:23.496Z",
"datePublished": "2026-10-01T03:28:22.807Z",
"dateUpdated": "2026-10-03T15:42:53.139Z"
},
"containers": {
"cna": {
"providerMetadata": {
"orgId": "b15e7b5b-3da4-40ae-a43c-f7aa60e62599",
"shortName": "Wordfence",
"dateUpdated": "2026-10-01T03:28:22.807Z"
},
"affected": [
{
"vendor": "croixhaug",
"product": "Simply Schedule Appointments",
"versions": [
{
"version": "0",
"status": "affected",
"lessThanOrEqual": "1.6.12.31",
"versionType": "semver"
}
],
"defaultStatus": "unaffected"
}
],
"descriptions": [
{
"lang": "en",
"value": "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."
}
],
"title": "Simply Schedule Appointments <= 1.6.12.31 - Insecure Direct Object Reference to Authenticated (Subscriber+) Sensitive Information Disclosure via 'complete_group' Parameter",
"references": [
{
"url": "https://www.wordfence.com/threat-intel/vulnerabilities/id/d1cd3de2-16ca-4f95-ad6f-47cfbe00c959?source=cve"
},
{
"url": "https://plugins.trac.wordpress.org/browser/simply-schedule-appointments/tags/1.6.12.27/includes/class-appointment-model.php#L3160"
},
{
"url": "https://plugins.trac.wordpress.org/browser/simply-schedule-appointments/tags/1.6.12.27/includes/class-appointment-model.php#L1966"
},
{
"url": "https://plugins.trac.wordpress.org/browser/simply-schedule-appointments/tags/1.6.12.27/includes/class-appointment-model.php#L2315"
},
{
"url": "https://plugins.trac.wordpress.org/browser/simply-schedule-appointments/tags/1.6.12.27/includes/class-db-model.php#L348"
},
{
"url": "https://plugins.trac.wordpress.org/changeset/3709365/simply-schedule-appointments/trunk/includes/class-appointment-model.php"
}
],
"problemTypes": [
{
"descriptions": [
{
"lang": "en",
"description": "CWE-639 Authorization Bypass Through User-Controlled Key",
"cweId": "CWE-639",
"type": "CWE"
}
]
}
],
"metrics": [
{
"cvssV3_1": {
"version": "3.1",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N",
"baseScore": 6.5,
"baseSeverity": "MEDIUM"
}
}
],
"credits": [
{
"lang": "en",
"type": "finder",
"value": "jtb75"
}
],
"timeline": [
{
"time": "2026-09-14T19:51:27.000Z",
"lang": "en",
"value": "Vendor Notified"
},
{
"time": "2026-09-30T15:10:42.000Z",
"lang": "en",
"value": "Disclosed"
}
]
},
"adp": [
{
"metrics": [
{
"other": {
"type": "ssvc",
"content": {
"id": "CVE-2026-91109",
"role": "CISA Coordinator",
"options": [
{
"Exploitation": "none"
},
{
"Automatable": "no"
},
{
"Technical Impact": "partial"
}
],
"version": "2.0.3",
"timestamp": "2026-10-03T15:29:26.447071Z"
}
}
}
],
"title": "CISA ADP Vulnrichment",
"providerMetadata": {
"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"shortName": "CISA-ADP",
"dateUpdated": "2026-10-03T15:42:53.139Z"
}
}
]
}
}