CVE-2021-23387 Open Redirect
An attacker can redirect users to malicious sites via double slashes in URLs, affecting applications using the trailing-slash npm package.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- Available
What is CVE-2021-23387?
CVE-2021-23387 is a medium-severity vulnerability in trailing-slash, published on 24 May 2021. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Official description
The package trailing-slash before 2.0.1 are vulnerable to Open Redirect via the use of trailing double slashes in the URL when accessing the vulnerable endpoint (such as https://example.com//attacker.example/). The vulnerable code is in index.js::createTrailing(), as the web server uses relative URLs instead of absolute URLs.
Weakness: CWE-601
Which versions are affected by CVE-2021-23387?
2 open source packages ship an affected version, including trailing-slash. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
trailing-slash npm | All versions | 2.0.1 |
trailing-slash npm | All versions | 2.0.1 |
Products include Trailing-Slash Project Trailing-Slash.
How do I fix CVE-2021-23387?
Upgrade trailing-slash to 2.0.1 or later.
Is CVE-2021-23387 being exploited?
There is no known exploitation of CVE-2021-23387 in the wild and no public exploit code.
Sources
Also known as GHSA-rfhr-62xp-2fp2, SNYK-JS-TRAILINGSLASH-1085707.