Cross-site Scripting Affecting express package, versions <4.20.0 >=5.0.0-alpha.1 <5.0.0


Severity

Recommended
0.0
medium
0
10

CVSS assessment made by Snyk's Security Team

    Threat Intelligence

    EPSS
    0.04% (10th percentile)

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  • Snyk ID SNYK-JS-EXPRESS-7926867
  • published 11 Sep 2024
  • disclosed 10 Sep 2024
  • credit AdamKorcz

How to fix?

Upgrade express to version 4.20.0, 5.0.0 or higher.

Overview

express is a minimalist web framework.

Affected versions of this package are vulnerable to Cross-site Scripting due to improper handling of user input in the response.redirect method. An attacker can execute arbitrary code by passing malicious input to this method.

Note

To exploit this vulnerability, the following conditions are required:

  1. The attacker should be able to control the input to response.redirect()

  2. express must not redirect before the template appears

  3. the browser must not complete redirection before:

  4. the user must click on the link in the template

References

CVSS Scores

version 4.0
version 3.1
Expand this section

Snyk

Recommended
5.1 medium
  • Attack Vector (AV)
    Network
  • Attack Complexity (AC)
    Low
  • Attack Requirements (AT)
    None
  • Privileges Required (PR)
    None
  • User Interaction (UI)
    Active
  • Confidentiality (VC)
    None
  • Integrity (VI)
    Low
  • Availability (VA)
    None
  • Confidentiality (SC)
    Low
  • Integrity (SI)
    Low
  • Availability (SA)
    None