CVE WatchOct 3, 2026

CVE-2026-91109

The Simply Schedule Appointments plugin for WordPress is vulnerable to Insecure Direct Object Reference in all versions up to, and including

CVSS

6.5

Medium

EPSS

0.3%

p24

KEV

—

Exploit Today

0-100

Published: Oct 1, 2026 · Last modified: Oct 3, 2026 · CWE-639

EPSS · 30d

0.3%EPSS · 30 days0.3%

2026-10-022026-10-21

Technical 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.

Official references

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