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CVE-2024-43796

LOW

express vulnerable to XSS via response.redirect()

Published September 10, 2024Updated February 4, 2026Source: osv

What Should I Do?

Address in Next Maintenance Window

Low exploitation probability (0.12%). Schedule for your next planned update.

Summary

### 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

Remediation

Upgrade to the fixed version using your package manager.

npm
Update express to 5.0.0 or later
npm install express@5.0.0
npm
Update express to 4.20.0 or later
npm install express@4.20.0

After upgrading, run your dependency scanner again to confirm the vulnerability is resolved.

Affected Packages (2)

PackageEcosystemAffectedFixed In
express
npm
All versions5.0.0
express
npm
All versions4.20.0

Vulnerability Classification

Common Weakness Enumeration (CWE) identifiers for this vulnerability type.

  • CWE-79
    Cross-site Scripting (XSS)MITRE

CVSS Score Breakdown

What the CVSS (Common Vulnerability Scoring System) 5.0 score means for each attack dimension.

Attack Vector
Network
Attack Complexity
High
Privileges Required
None
User Interaction
Required
Scope
Unchanged
Confidentiality
Low
Integrity
Low
Availability
Low

CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:L/A:L

References

Frequently Asked Questions

What is CVE-2024-43796?
express vulnerable to XSS via response.redirect() This vulnerability has been assigned a severity rating of LOW (CVSS score: 5.0/10).
How do I check if my project is affected by CVE-2024-43796?
CVE-2024-43796 affects express. It has a 0.1% probability of exploitation within 30 days (EPSS score). Use GeekWala's free vulnerability scanner to check your dependencies against CVE-2024-43796 and 200,000+ other known vulnerabilities.

Severity & Exploitability

CVSS Score
5.0

Exploitation requires specific conditions or has limited impact. Remediate within weeks.

EPSS Score (30-day exploit probability)
0.12%
Higher than 31% of vulnerabilities

Also Known As

GHSA-qw6h-vgh9-j6wx

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