This vulnerability allows Express.js applications to be exploited through open redirects. Versions of Express.js prior to 4.19.0 and all pre-release alpha and beta versions of 5.0 are impacted by this issue, which arises when a user performs a redirect using a user-provided URL. Express performs encoding on the contents before passing it to the location header, which can lead to the evaluation of malformed URLs in unexpected ways.
The affected method, res.location(), is also invoked from within res.redirect(). This vulnerability could allow attackers to bypass properly implemented redirect allow lists in Express applications, potentially leading to unauthorized redirection of users to malicious sites.
This vulnerability has been addressed in versions 4.19.2 and 5.0.0-beta.3 of Express.js. Organizations utilizing affected versions should prioritize patching immediately to mitigate risks associated with this vulnerability.
Risk to organizations includes potential phishing attacks and unauthorized access to sensitive data, emphasizing the importance of timely remediation efforts.
As this vulnerability is classified with a CVSS score of 6.1, organizations should address it in their priority patch cycle to safeguard against possible exploitation.
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
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