CVE-2026-39620 CRITICAL

CVE-2026-39620: WordPress Appointment theme <= 3.5.5 - Cross Site Request Forgery (CSRF) to Arbitrary File Upload vulnerability

Vendor Priyanshumittal
Product Appointment
Weakness CWE-352 · CSRF
Published April 8, 2026
Last update April 29, 2026
View on NVD All CVEs

CVSS base score

9.6/10
Attack vector Network
Attack complexity Low
Privileges required None
User interaction Required
Confidentiality High
Integrity High

CVSS vector

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

What the vulnerability does

01Description

Cross-Site Request Forgery (CSRF) vulnerability in priyanshumittal Appointment appointment allows Upload a Web Shell to a Web Server.This issue affects Appointment: from n/a through <= 3.5.5.

Explanation of Vulnerability in Simple Terms

02Summary

Appointment versions up to 3.5.5 contain a cross-site request forgery (CSRF) vulnerability that allows an attacker to perform unauthorized actions on behalf of a logged-in user. The vulnerability requires user interaction—typically clicking a malicious link or visiting a compromised page. An attacker can modify appointments, change settings, or perform other administrative actions depending on the victim's permissions.

What an attacker can do

03Attacker Capabilities

Perform unauthorized actions (create, modify, or delete appointments) on behalf of a logged-in user without their knowledge.

Potential impact on your site

04Site Impact

Users' appointment data can be altered or deleted by attackers without consent; administrative actions may be performed without authorization.

Conditions required to exploit

05Prerequisites

Victim must be logged in and click a malicious link or visit an attacker-controlled page while authenticated.

Key dates

06Disclosure timeline

April 8, 2026 CVE published
April 29, 2026 Record updated

Related vulnerabilities

08Related CVE

CVE-2026-8907 WP-Ultimate-Map <= 1.1 - Cross-Site Request Forgery to Stored Cross-Site Scripting via 'zoom-level' Parameter CVE-2026-57757 WordPress pCloud WP Backup plugin <= 2.0.2 - Cross Site Request Forgery (CSRF) vulnerability CVE-2026-57751 WordPress Heateor Social Login plugin <= 1.1.39 - Cross Site Request Forgery (CSRF) vulnerability CVE-2026-6455 WP Contact Form 7 DB Handler <= 3.0 - Cross-Site Request Forgery to Arbitrary File Deletion via 'contact_form' Parameter CVE-2026-7533 Easy Digital Downloads <= 3.6.7 - Cross-Site Request Forgery to Payment Account Hijacking via 'square_tokens' Parameter