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Online Scheduling and Appointment Booking System – Bookly <= 27.0 — Unauthenticated Price Manipulation via 'tips'

CVE-2026-2519Published · Updated

Action summary

Affected: ≤27.0Update to 27.1 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-472 External Control of Assumed-Immutable Web Parameter
Required access
No account needed
Exploit prediction (EPSS)
No score
CISA KEV
Not listed
On this page8

Am I affected?

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

  1. Affected≤ 27.0
  2. Patched in27.1

Update to 27.1 or newer.

You are affected if you run ≤ 27.0. Version 27.1 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 27.1, 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 Youssef Elouaer.

The Online Scheduling and Appointment Booking System – Bookly plugin for WordPress is vulnerable to price manipulation via the 'tips' parameter in all versions up to, and including, 27.0. This is due to the plugin trusting a user-supplied input without server-side validation against the configured price. This makes it possible for unauthenticated attackers to submit a negative number to the 'tips' parameter, causing the total price to be reduced to zero.

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.
VulnCrest content
Summary, remediation guidance and page layout © VulnCrest. Not sourced from NVD.

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