Server-Side Validation Flaw in Bookly Plugin for WordPress
CVE-2026-86838
5.3MEDIUM
Key Information:
Badges
👾 Exploit Exists🟡 Public PoC
What is CVE-2026-86838?
The Bookly plugin for WordPress prior to version 28.3 contains a vulnerability where it fails to properly validate the booking quantity input from clients on the server side. This oversight enables unauthenticated users to manipulate the booking process, allowing them to set the total appointment cost to zero. As a result, unauthorized individuals can book services without making any payment, effectively bypassing the intended checkout mechanism.
Affected Version(s)
Bookly 0 < 28.3
Exploit Proof of Concept (PoC)
PoC code is written by security researchers to demonstrate the vulnerability can be exploited. PoC code is also a key component for weaponization which could lead to ransomware.
References
CVSS V3.1
Score:
5.3
Severity:
MEDIUM
Confidentiality:
None
Integrity:
Low
Availability:
None
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged
Timeline
- 🟡
Public PoC available
- 👾
Exploit known to exist
Vulnerability published
Vulnerability Reserved
Credit
vuxvinh
WPScan