CVE-2024-0856

Appointment Booking Calendar <= 1.3.82 - Cross-Site Request Forgery

2024-02-28 00:00
Sushil Phuyal

Strategic Overview

Status
Patched in 1.3.83
Affected Plugin
Appointment Booking Calendar
Affected Version
<= 1.3.82
CVSS
5.4Medium
Weakness type
CWE-352 · Cross-Site Request Forgery (CSRF)
CVE
CVE-2024-0856
View all Appointment Booking Calendar vulnerabilities

At a glance

CVE-2024-0856 is a medium-severity Cross-Site Request Forgery (CSRF) vulnerability in the Appointment Booking Calendar WordPress plugin, affecting versions <= 1.3.82. It carries a CVSS score of 5.4 (reachable over the network; low attack complexity). Exploitation requires no authentication. The issue is fixed in version 1.3.83; sites on affected versions should update now. Disclosed February 2024, reported by Sushil Phuyal.

Vulnerability Overview

The Appointment Booking Calendar plugin for WordPress is vulnerable to Cross-Site Request Forgery in all versions up to, and including, 1.3.82. This is due to missing or incorrect nonce validation on the cpabc_appointments.php page. This makes it possible for unauthenticated attackers to perform actions like adding bookings without paying via a forged request granted they can trick a site administrator into performing an action such as clicking on a link.

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.

CWE-352: Cross-Site Request Forgery (CSRF)

Reaching this weakness in Appointment Booking Calendar <= 1.3.82 takes a caller who can reach the endpoint. Cross-site request forgery abuses the fact that browsers attach a victim's cookies to any request, so a state-changing action that only checks who you are, not whether you meant to act, can be triggered from another site.

An attacker who gets a logged-in user to load a crafted page can perform that action as them, with the impact scaling to whatever the victim's role is allowed to do. For Appointment Booking Calendar the fix is 1.3.83: builds <= 1.3.82 are affected, anything from 1.3.83 onward is not.

Remediation

Update to version 1.3.83, or a newer patched version

How does WordSec protect against this?

The attempt arrives as an ordinary request to Appointment Booking Calendar: WordSec's web application firewall inspects request payloads before WordPress loads them. None of that substitutes for the fix: Appointment Booking Calendar 1.3.83 closes this, and updating the plugin is the step that ends it.

  • Firewall
  • Alerts

External References

https://www.cve.org/CVERecord?id=CVE-2024-0856https://www.wordfence.com/threat-intel/vulnerabilities/id/7dc6d1db-37ae-4198-84bd-944dad4926c7https://nvd.nist.gov/vuln/detail/CVE-2024-0856

Related records

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