CVE-2026-27377 MEDIUM

CVE-2026-27377: WordPress QuickCal - Appointment Booking Calendar for WordPress plugin <= 1.0.16 - Broken Access Control vulnerability

Vendor Axiomthemes

Product QuickCal - Appointment Booking Calendar for WordPress

Weakness CWE-862 · Missing authorization

Published July 23, 2026

Last update July 23, 2026

View on NVD All CVEs

CVSS base score

6.7/10

Attack vector Network

Attack complexity Low

Privileges required High

User interaction None

Confidentiality High

Integrity Low

CVSS vector

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

What the vulnerability does

01Description

Booking Agent Broken Access Control in QuickCal - Appointment Booking Calendar for WordPress <= 1.0.16 versions.

Explanation of Vulnerability in Simple Terms

02Summary

The QuickCal appointment booking plugin for WordPress does not properly check user permissions before allowing certain administrative actions. An attacker with high-level site access can read sensitive appointment data, modify booking records, and disrupt the plugin's availability. Sites using this plugin should update immediately.

What an attacker can do

03Attacker Capabilities

Read appointment data, modify bookings, and disrupt the calendar if they have high-level site access.

Potential impact on your site

04Site Impact

Appointment data may be exposed or altered by privileged users; calendar availability could be affected.

Conditions required to exploit

05Prerequisites

Attacker must have high-level WordPress privileges (administrator or equivalent role).

Key dates

06Disclosure timeline

July 23, 2026 CVE published

July 23, 2026 Record updated

External resources

07References

NVD — National Vulnerability Database https://nvd.nist.gov/vuln/detail/CVE-2026-27377 CWE — Common Weakness Enumeration https://cwe.mitre.org/data/definitions/862.html AskarLabs — CWE-862 write-up Missing Authorization

Related vulnerabilities

Identifiers

CVE CVE-2026-27377

CWE CWE-862

CVSS 6.7 / MEDIUM

Affected versions