CVE-2021-27340 : What You Need to Know

OpenSIS Community Edition version <= 7.6 is affected by a reflected XSS vulnerability in EmailCheck.php via the "opt" parameter.

Understanding CVE-2021-27340

This CVE describes a reflected XSS vulnerability in OpenSIS Community Edition version <= 7.6, specifically in EmailCheck.php.

What is CVE-2021-27340?

CVE-2021-27340 refers to a reflected Cross-Site Scripting (XSS) vulnerability present in OpenSIS Community Edition version <= 7.6, which can be exploited via the "opt" parameter in EmailCheck.php. This vulnerability could allow an attacker to execute malicious scripts in the context of a victim's browser.

The Impact of CVE-2021-27340

Exploitation of this vulnerability could lead to unauthorized access to sensitive information, session hijacking, or other malicious activities conducted by the attacker.

Technical Details of CVE-2021-27340

The technical details of CVE-2021-27340 include:

Vulnerability Description

The vulnerability involves a lack of proper input validation in the "opt" parameter of EmailCheck.php, leading to the execution of arbitrary scripts.

Affected Systems and Versions

OpenSIS Community Edition version <= 7.6 is confirmed to be affected by this vulnerability.

Exploitation Mechanism

By injecting malicious scripts into the "opt" parameter of EmailCheck.php, an attacker can trigger the execution of the injected code in the victim's browser.

Mitigation and Prevention

To mitigate the risks associated with CVE-2021-27340, consider the following:

Immediate Steps to Take

Users are advised to update OpenSIS Community Edition to a patched version that addresses this vulnerability.
Avoid clicking on suspicious links or visiting untrusted websites that may exploit this vulnerability.

Long-Term Security Practices

Implement secure coding practices to sanitize user input and prevent XSS vulnerabilities.
Regular security audits and code reviews can help identify and address such vulnerabilities in the early stages.

Patching and Updates

Stay informed about security updates and patches released by OpenSIS Community Edition to promptly apply fixes for known vulnerabilities.