Open redirect in trailing-slash - CVE-2021-23387

Vulnerability details

The vulnerability allows a remote attacker to redirect victims to arbitrary URL.

The vulnerability exists due to the use of trailing double slashes in the URL when accessing the vulnerable endpoint. A remote attacker can create a link that leads to a trusted website, however, when clicked, redirects the victim to arbitrary domain.

Successful exploitation of this vulnerability may allow a remote attacker to perform a phishing attack and steal potentially sensitive information.

Affected software

How to mitigate CVE-2021-23387

External References

• https://github.com/fardog/trailing-slash/blob/f640ece055fe85275c983de5eb94661b95e35670/index.js%23L36
• https://snyk.io/vuln/SNYK-JS-TRAILINGSLASH-1085707
• https://github.com/fardog/trailing-slash/commit/f8e66f1429308247e5a119d430203077d8f05048

Related Security Bulletins

• Open redirect in trailing-slash package for npm