CVE-2026-104898
The Online Scheduling and Appointment Booking System – Bookly plugin for WordPress is vulnerable to Insecure Direct Object Reference in all versions up to, and including, 28.4 via the 'id, wp_user_id' parameter due to missing validation on a user…
Does this matter?
Lower severity and a low EPSS score (0.25%). Track it; it rarely justifies an emergency change on its own.
Description
The Online Scheduling and Appointment Booking System – Bookly plugin for WordPress is vulnerable to Insecure Direct Object Reference in all versions up to, and including, 28.4 via the 'id, wp_user_id' parameter due to missing validation on a user controlled key. This makes it possible for authenticated attackers, with subscriber-level access and above, to overwrite the WordPress account binding of any Bookly staff record, including those owned by administrators, effectively hijacking a higher-privileged staff member's account association and escalating privileges. Exploitation requires the attacking user to be linked to at least one Bookly staff record, which occurs by default whenever an admin enables the bookly_gen_allow_staff_edit_profile option (active on fresh installs) and links a WordPress user to a staff entry.
- CVSS 3.1
- 6.8 MEDIUMCVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:N
- EPSS
- 0.25% probability · 16th percentile
- Public exploits
- None in Exploit-DB
- CISA KEV
- Not listed
- Weakness
- CWE-639
- Source
- security@wordfence.com
EPSS moved from 0.3% on 10 October 2026 to 0.2% on 26 October 2026.
References
- https://plugins.trac.wordpress.org/browser/bookly-responsive-appointment-booking-tool/tags/28.4/backend/components/dialogs/staff/edit/Ajax.php#L111
- https://plugins.trac.wordpress.org/browser/bookly-responsive-appointment-booking-tool/tags/28.4/backend/components/dialogs/staff/edit/Ajax.php#L364
- https://plugins.trac.wordpress.org/browser/bookly-responsive-appointment-booking-tool/tags/28.4/backend/components/dialogs/staff/edit/Ajax.php#L93
- https://plugins.trac.wordpress.org/browser/bookly-responsive-appointment-booking-tool/tags/28.4/lib/base/Entity.php#L172
- https://plugins.trac.wordpress.org/browser/bookly-responsive-appointment-booking-tool/tags/28.4/lib/base/Entity.php#L247
- https://plugins.trac.wordpress.org/browser/bookly-responsive-appointment-booking-tool/tags/28.4/lib/base/Request.php#L49
- https://plugins.trac.wordpress.org/changeset?reponame=&new=3730881%40bookly-responsive-appointment-booking-tool%2Ftags%2F28.5&old=3722721%40bookly-responsive-appointment-booking-tool%2Ftags%2F28.4
- https://www.wordfence.com/threat-intel/vulnerabilities/id/1c3cfaa5-00e3-41b6-8f38-cebdd5dec180?source=cve
Source: NVD record, EPSS from FIRST.org, KEV from CISA, exploits from Exploit-DB. Refreshed daily. Download this record as JSON.