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.
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History
Sat, 03 Oct 2026 16:30:00 +0000
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Thu, 01 Oct 2026 16:00:00 +0000
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Croixhaug
Croixhaug simply Schedule Appointments Wordpress-extensions Wordpress-extensions simply Schedule Appointments |
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Croixhaug simply Schedule Appointments Wordpress-extensions Wordpress-extensions simply Schedule Appointments |
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| 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. | |
| Title | Simply Schedule Appointments <= 1.6.12.31 - Insecure Direct Object Reference to Authenticated (Subscriber+) Sensitive Information Disclosure via 'complete_group' Parameter | |
| Weaknesses | CWE-639 | |
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| Metrics |
cvssV3_1
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Status: PUBLISHED
Assigner: Wordfence
Published: 2026-10-01T03:28:22.807Z
Updated: 2026-10-03T15:42:53.139Z
Reserved: 2026-09-14T19:36:23.496Z
Link: CVE-2026-91109
Updated: 2026-10-03T15:41:22.060Z
Status : Deferred
Published: 2026-10-01T04:18:21.557
Modified: 2026-10-03T16:16:41.497
Link: CVE-2026-91109
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