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

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Summary

CVECVE-2026-2519
StatePUBLISHED
AssignerWordfence
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-04-09 13:16:42 UTC
Updated2026-04-13 15:02:47 UTC
DescriptionThe 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.

Risk And Classification

Primary CVSS: v3.1 5.3 MEDIUM from [email protected]

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N

EPSS: 0.000420000 probability, percentile 0.128080000 (date 2026-04-15)

Problem Types: CWE-472 | CWE-472 CWE-472 External Control of Assumed-Immutable Web Parameter

VersionSourceTypeScoreSeverityVector
3.1[email protected]Primary5.3MEDIUMCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
3.1CNADECLARED5.3MEDIUMCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
Low
Availability
None

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Ladela Online Scheduling And Appointment Booking System Bookly affected 27.0 semver Not specified

References

ReferenceSourceLinkTags
plugins.trac.wordpress.org/browser/bookly-responsive-appointment-booking-tool/trunk/lib/... [email protected] plugins.trac.wordpress.org
www.wordfence.com/threat-intel/vulnerabilities/id/ead87d8b-2659-4e8b-a0b9-138b1... [email protected] www.wordfence.com
plugins.trac.wordpress.org/changeset/3480956 [email protected] plugins.trac.wordpress.org
www.booking-wp-plugin.com/change-log [email protected] www.booking-wp-plugin.com
plugins.trac.wordpress.org/browser/bookly-responsive-appointment-booking-tool/trunk/lib/... [email protected] plugins.trac.wordpress.org
plugins.trac.wordpress.org/browser/bookly-responsive-appointment-booking-tool/trunk/fron... [email protected] plugins.trac.wordpress.org
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

Vendor Comments And Credit

Discovery Credit

CNA: Youssef Elouaer (en)

Additional Advisory Data

SourceTimeEvent
CNA2026-03-31T11:25:57.000ZVendor Notified
CNA2026-04-08T00:00:00.000ZDisclosed
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