medium
5
CWE
79
Advisory Published
Advisory Published
Updated

CVE-2024-43796: express vulnerable to XSS via response.redirect()

First published: Tue Sep 10 2024(Updated: )

### Impact In express <4.20.0, passing untrusted user input - even after sanitizing it - to `response.redirect()` may execute untrusted code ### Patches this issue is patched in express 4.20.0 ### Workarounds users are encouraged to upgrade to the patched version of express, but otherwise can workaround this issue by making sure any untrusted inputs are safe, ideally by validating them against an explicit allowlist ### Details successful exploitation of this vector requires the following: 1. The attacker MUST control the input to response.redirect() 1. express MUST NOT redirect before the template appears 1. the browser MUST NOT complete redirection before: 1. the user MUST click on the link in the template

Credit: security-advisories@github.com security-advisories@github.com

Affected SoftwareAffected VersionHow to fix
npm/express>=5.0.0-alpha.1<5.0.0
5.0.0
npm/express<4.20.0
4.20.0
OpenJSF Express<4.20.0
OpenJSF Express=5.0.0-alpha1
OpenJSF Express=5.0.0-alpha2
OpenJSF Express=5.0.0-alpha3
OpenJSF Express=5.0.0-alpha4
OpenJSF Express=5.0.0-alpha5
OpenJSF Express=5.0.0-alpha6
OpenJSF Express=5.0.0-alpha7
OpenJSF Express=5.0.0-alpha8
OpenJSF Express=5.0.0-beta1
OpenJSF Express=5.0.0-beta2
OpenJSF Express=5.0.0-beta3

Remedy

https://github.com/expressjs/express/commit/54271f69b511fea198471e6ff3400ab805d6b553

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Reference Links

Parent vulnerabilities

(Appears in the following advisories)

Frequently Asked Questions

  • What is the severity of CVE-2024-43796?

    The severity of CVE-2024-43796 is considered high due to its potential to allow remote code execution through untrusted user input.

  • How do I fix CVE-2024-43796?

    To fix CVE-2024-43796, upgrade to express version 4.20.0 or later.

  • Which versions of express are affected by CVE-2024-43796?

    CVE-2024-43796 affects all versions of express up to and including 4.20.0.

  • Is there a workaround for CVE-2024-43796 if I can't upgrade?

    There are no recommended workarounds for CVE-2024-43796 other than upgrading to the patched version of express.

  • What impact does CVE-2024-43796 have on my application?

    CVE-2024-43796 could allow an attacker to execute arbitrary code in your application by leveraging improperly sanitized user input during redirects.

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