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WordPress plugin

Bookly <= 28.1 — Unauthenticated Insecure Direct Object Reference

CVE-2026-91847Published · Updated

Action summary

Affected: ≤28.1Update to 28.2 or newer

All remediation steps
Watch plugin
Severity
Medium5.3
CVSS
5.3
CVSS 3.1 · CNA (Wordfence)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
What does this vector mean?
AV:N Attack vector
Network
AC:L Attack complexity
Low
PR:N Privileges required
None
UI:N User interaction
None
S:U Scope
Unchanged
C:N Confidentiality
None
I:L Integrity
Low
A:N Availability
None
Weakness
CWE-639 Authorization Bypass Through User-Controlled Key
Required access
No account needed
Exploit prediction (EPSS)
0.2% chance in 30 days12th percentile
CISA KEV
Not listed
On this page8

Am I affected?

Online Scheduling and Appointment Booking System – Bookly bookly-responsive-appointment-booking-tool

  1. Affected≤ 28.1
  2. Patched in28.2

Update to 28.2 or newer.

You are affected if you run ≤ 28.1. Version 28.2 and later are not affected by this issue.

  • Check your version: in wp-admin go to Plugins → Installed Plugins and read the version under Online Scheduling and Appointment Booking System – Bookly.
  • No admin access? Run a passive check of your site. It reads public files only.
  • No account is needed to exploit this. Treat any exposed site on an affected version as at risk.

What to do

  1. Update to version 28.2, or a newer patched version
  2. Rotate administrator passwords and application secrets if the site ran a vulnerable version while publicly reachable.
  3. Watch Online Scheduling and Appointment Booking System – Bookly to get an email when the next vulnerability is published.

Advisory

Source description from Wordfence Intelligence, credited to vuxvinh.

The Bookly plugin for WordPress is vulnerable to Insecure Direct Object Reference in all versions up to, and including, 28.1. This is due to missing validation on a user controlled key. This makes it possible for unauthenticated attackers to perform an unauthorized action.

Exploits & references

Proof-of-concept & detection

No public proof-of-concept or detection template is known for this vulnerability.

Advisories & patches

More in Online Scheduling and Appointment Booking System – Bookly

All 32
More vulnerabilities in Online Scheduling and Appointment Booking System – Bookly
SeverityVulnerabilityCVEPublished
High7.2Authenticated (Custom+) PHP Object Injection via 'value' Parameter
≤28.2Update to 28.3
CVE-2026-12626
Medium6.8Insecure Direct Object Reference to Authenticated (Subscriber+) Privilege Escalation via 'id' and 'wp_user_id' Parameters via Query String / JSON Body
≤28.4Update to 28.5
CVE-2026-104898
Medium5.3Unauthenticated Sensitive Information Exposure in 'phone' Parameter to bookly_render_details
≤28.4Update to 28.5
CVE-2026-103365
Medium4.3Authenticated (Staff+) Insecure Direct Object Reference
≤28.2Update to 28.3
CVE-2026-86839
Medium5.3Unauthenticated Payment Bypass
≤28.2Update to 28.3
CVE-2026-86838

Timeline

  1. CVE published

    Severity medium, CVSS 5.3

  2. Record last updated

Sources & licenses

Wordfence record
Vulnerability data
Wordfence Intelligence. Copyright 2012-2026 Defiant Inc. Licensed under the CC BY-SA 4.0.
CVE® identifiers
Copyright 1999-2026 The MITRE Corporation. Used under the CVE Program. CVE® is a registered trademark of The MITRE Corporation.
CVSS / CWE
National Vulnerability Database (NVD), shown unmodified. This product uses the NVD API but is not endorsed or certified by the NVD.
EPSS
Exploit Prediction Scoring System by FIRST.org.
VulnCrest content
Summary, remediation guidance and page layout © VulnCrest. Not sourced from NVD.

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