CVE-2021-27902 : Vulnerability Insights and Analysis

Craft CMS before version 3.6.0 was found to have a potential XSS vulnerability related to front-end forms accepting user uploads.

Understanding CVE-2021-27902

This CVE identifies a security issue in Craft CMS that could lead to cross-site scripting (XSS) attacks when users submit uploads via front-end forms.

What is CVE-2021-27902?

Craft CMS versions before 3.6.0 are affected by a vulnerability that allows for XSS attacks in specific scenarios involving user uploads through front-end forms.

The Impact of CVE-2021-27902

The vulnerability in Craft CMS could be exploited by malicious actors to execute arbitrary scripts in the context of a user's session, potentially leading to unauthorized actions or data theft.

Technical Details of CVE-2021-27902

Craft CMS versions prior to 3.6.0 are susceptible to a security flaw that exposes users to XSS risks.

Vulnerability Description

The issue originates from the handling of user uploads in front-end forms, creating opportunities for malicious script injections.

Affected Systems and Versions

All Craft CMS versions before 3.6.0 are impacted by this XSS vulnerability.

Exploitation Mechanism

Attackers could exploit this vulnerability by crafting malicious uploads that execute scripts when processed by the affected forms.

Mitigation and Prevention

To address CVE-2021-27902, immediate steps should be taken to secure Craft CMS installations and prevent XSS attacks.

Immediate Steps to Take

Craft CMS users are advised to update to version 3.6.0 or newer to eliminate the vulnerability and enhance security.

Long-Term Security Practices

Regular security updates, code reviews, and input validation practices can help mitigate XSS risks in web applications like Craft CMS.

Patching and Updates

Stay informed about security patches released by Craft CMS developers and apply updates promptly to protect systems from known vulnerabilities.