CVE-2026-42667

Online Scheduling and Appointment Booking System – Bookly <= 27.4 - Unauthenticated Information Exposure

2026-05-10 00:00

Strategic Overview

Status: Patched in 27.5
Affected Plugin: Online Scheduling and Appointment Booking System – Bookly
Affected Version: <= 27.4
CVSS: 5.3Medium
Weakness type: CWE-200 · Exposure of Sensitive Information to an Unauthorized Actor
CVE: CVE-2026-42667

View all Online Scheduling and Appointment Booking System – Bookly vulnerabilities

At a glance

CVE-2026-42667 is a medium-severity Exposure of Sensitive Information to an Unauthorized Actor vulnerability in the Online Scheduling and Appointment Booking System WordPress plugin, affecting versions <= 27.4. It carries a CVSS score of 5.3 (reachable over the network; low attack complexity). Exploitation requires no authentication. The issue is fixed in version 27.5; sites on affected versions should update now. Disclosed May 2026, reported by Tiago Ventura (perses).

Vulnerability Overview

The Online Scheduling and Appointment Booking System – Bookly plugin for WordPress is vulnerable to Sensitive Information Exposure in all versions up to, and including, 27.4. This makes it possible for unauthenticated attackers to extract sensitive user or configuration data.

Technical Analysis

The vector marks this flaw as remotely reachable over the network, with low attack complexity — no special timing or configuration is needed, and no privileges on the target site, and no interaction from a victim user.

CWE-200: Exposure of Sensitive Information to an Unauthorized Actor

Reaching this weakness in Online Scheduling and Appointment Booking System <= 27.4 takes no account at all. Sensitive information exposure means data the application intended to keep internal is returned to a caller who should not be able to see it.

The disclosed data — credentials, tokens, customer records or internal paths — is usually worth more as material for a follow-up attack than as an end in itself. For Online Scheduling and Appointment Booking System the fix is 27.5: builds <= 27.4 are affected, anything from 27.5 onward is not.

Remediation

Update to version 27.5, or a newer patched version

How does WordSec protect against this?

This one needs no account at all, which puts it outside what login hardening can reach; WordSec's login security narrows the account-level paths around it, and the firewall is what inspects the request itself. None of that substitutes for the fix: Online Scheduling and Appointment Booking System 27.5 closes this, and updating the plugin is the step that ends it.

Login Security
Alerts

External References

https://www.cve.org/CVERecord?id=CVE-2026-42667 https://www.wordfence.com/threat-intel/vulnerabilities/id/0c976b67-8236-4b34-be93-075beea11f0e https://nvd.nist.gov/vuln/detail/CVE-2026-42667

Related records

Other vulnerabilities in Online Scheduling and Appointment Booking System – Bookly

CVSS Vector

5.3

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

Base

Attack VectorNetwork
Attack ComplexityLow
Privileges RequiredNone
User InteractionNone
ScopeUnchanged
ConfidentialityLow
IntegrityNone
AvailabilityNone

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