CVE-2021-3783 : Security Advisory and Response

Cross-site Scripting (XSS) vulnerability has been identified in yourls/yourls affecting versions up to 1.8.2. Here's what you need to know about CVE-2021-3783.

Understanding CVE-2021-3783

This section provides an overview of the CVE-2021-3783 vulnerability affecting yourls/yourls.

What is CVE-2021-3783?

CVE-2021-3783 is a Cross-site Scripting (XSS) vulnerability present in yourls/yourls, leading to improper neutralization of input during web page generation.

The Impact of CVE-2021-3783

The vulnerability poses a medium severity risk with a CVSS base score of 6.6. It has a high impact on availability, confidentiality, and integrity of the affected systems, requiring high privileges for exploitation.

Technical Details of CVE-2021-3783

This section delves into the technical aspects of CVE-2021-3783 to provide a deeper understanding of the vulnerability.

Vulnerability Description

The vulnerability results from improper neutralization of input during web page generation, allowing for Cross-site Scripting (XSS) attacks to occur.

Affected Systems and Versions

yourls/yourls versions up to 1.8.2 are affected by this vulnerability.

Exploitation Mechanism

The attack complexity for exploiting this vulnerability is high, with a network-based attack vector and no user interaction required.

Mitigation and Prevention

In order to protect systems from CVE-2021-3783, appropriate mitigation and prevention measures need to be implemented.

Immediate Steps to Take

Immediately update yourls/yourls to a non-affected version and implement security measures to mitigate XSS vulnerabilities.

Long-Term Security Practices

Maintain secure coding practices and conduct regular security assessments to prevent similar vulnerabilities in the future.

Patching and Updates

Stay informed about security patches and updates released by the vendor to address CVE-2021-3783 and other potential vulnerabilities.