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Moderate severityNVD Advisory· Published Mar 25, 2024· Updated Aug 2, 2024

Express.js Open Redirect in malformed URLs

CVE-2024-29041

Description

Express.js minimalist web framework for node. Versions of Express.js prior to 4.19.0 and all pre-release alpha and beta versions of 5.0 are affected by an open redirect vulnerability using malformed URLs. When a user of Express performs a redirect using a user-provided URL Express performs an encode using `encodeurl` on the contents before passing it to the location header. This can cause malformed URLs to be evaluated in unexpected ways by common redirect allow list implementations in Express applications, leading to an Open Redirect via bypass of a properly implemented allow list. The main method impacted is res.location() but this is also called from within res.redirect(). The vulnerability is fixed in 4.19.2 and 5.0.0-beta.3.

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Affected packages

Versions sourced from the GitHub Security Advisory.

PackageAffected versionsPatched versions
expressnpm
< 4.19.24.19.2
expressnpm
>= 5.0.0-alpha.1, < 5.0.0-beta.35.0.0-beta.3

Affected products

48

Patches

Vulnerability mechanics

References

8

News mentions

0

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