CVE-2026-104898
Online Scheduling and Appointment Booking System <= 28.4 - Insecure Direct Object Reference to Authenticated (Subscriber+) Privilege Escalation via 'id' and 'wp_user_id' Parameters via Query String / JSON Body
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.
INFO
Published Date :
Oct. 10, 2026, 4:18 a.m.
Last Modified :
Oct. 10, 2026, 4:18 a.m.
Remotely Exploit :
Yes !
Source :
[email protected]
Affected Products
The following products are affected by CVE-2026-104898
vulnerability.
Even if cvefeed.io is aware of the exact versions of the
products
that
are
affected, the information is not represented in the table below.
No affected product recoded yet
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS 3.1 | MEDIUM | MITRE-CVE | ||||
| CVSS 3.1 | MEDIUM | [email protected] |
Solution
- Update the Bookly plugin to the latest version.
- Validate all user-controlled keys for security.
- Review and restrict access to staff records.
- Disable staff profile editing if unnecessary.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-104898.
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-104898 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-104898
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-104898 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-104898 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
New CVE Received by [email protected]
Oct. 10, 2026
Action Type Old Value New Value Added 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. Added CVSS V3.1 AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:N Added CWE CWE-639 Added Affected New affected value received. <a href="https://github.com/CVEProject/cvelistV5/blob/main/cves/2026/104xxx/CVE-2026-104898.json">CVE-2026-104898</a> Added Reference https://plugins.trac.wordpress.org/browser/bookly-responsive-appointment-booking-tool/tags/28.4/backend/components/dialogs/staff/edit/Ajax.php#L111 Added Reference https://plugins.trac.wordpress.org/browser/bookly-responsive-appointment-booking-tool/tags/28.4/backend/components/dialogs/staff/edit/Ajax.php#L364 Added Reference https://plugins.trac.wordpress.org/browser/bookly-responsive-appointment-booking-tool/tags/28.4/backend/components/dialogs/staff/edit/Ajax.php#L93 Added Reference https://plugins.trac.wordpress.org/browser/bookly-responsive-appointment-booking-tool/tags/28.4/lib/base/Entity.php#L172 Added Reference https://plugins.trac.wordpress.org/browser/bookly-responsive-appointment-booking-tool/tags/28.4/lib/base/Entity.php#L247 Added Reference https://plugins.trac.wordpress.org/browser/bookly-responsive-appointment-booking-tool/tags/28.4/lib/base/Request.php#L49 Added Reference 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 Added Reference https://www.wordfence.com/threat-intel/vulnerabilities/id/1c3cfaa5-00e3-41b6-8f38-cebdd5dec180?source=cve