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5.4

Koa Remove Trailing Slashes Allows URL Hijacking

CVE-2021-23384 · published 5 years ago
Summary

Koa Remove Trailing Slashes versions before 2.0.2 contain a security flaw that lets attackers redirect users to malicious websites. This affects websites using Koa Remove Trailing Slashes, which rely on absolute URLs to prevent such attacks. Update to version 2.0.2 or later to fix this issue.

What to do
  • Update pakerstrand koa-remove-trailing-slashes to version 2.0.2.
  • Update koa-remove-trailing-slashes_project koa-remove-trailing-slashes to version 2.0.2 or later.
Affected software
Ecosystem VendorProductAffected versions
npm pakerstrand koa-remove-trailing-slashes < 2.0.2
Fix: upgrade to 2.0.2
– koa-remove-trailing-slashes_project koa-remove-trailing-slashes < 2.0.2
cpe:2.3:a:koa-remove-trailing-slashes_project:koa-remove-trailing-slashes:*:*:*:*:*:node.js:*:*
Original advisory text
The package koa-remove-trailing-slashes before 2.0.2 are vulnerable to Open Redirect via the use of trailing double slashes in the URL when accessing the vulnerable endpoint (such as https://exampl...
The package koa-remove-trailing-slashes before 2.0.2 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::removeTrailingSlashes(), as the web server uses relative URLs instead of absolute URLs.
References
Severity
5.4 Medium
CVSS 3.1: 5.4 (GHSA)
Exploitation
EPSS <1%
Type
CWE-601Open Redirect
Timeline
Published17 May 2021
Updated15 Aug 2026
First seen6 Mar 2026
Sources
GHSA-r773-pmw3-f4mr · GHSA
CVE-2021-23384 · NVD
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