PatchTheCVECVE-2014-6393: The Express web framework before 3.11 and 4.x before 4.5 for Node.js does not provide a charset field in HTTP
CVE-2014-6393 is a medium-severity flaw (CVSS 6.1) affecting express. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.
The Express web framework before 3.11 and 4.x before 4.5 for Node.js does not provide a charset field in HTTP Content-Type headers in 400 level responses, which might allow remote attackers to conduct cross-site scripting (XSS) attacks via characters in a non-standard encoding.
Why this priority
- No elevated risk signals yet
A fixed release or distro patch exists.
Risk facts
| CVSS score | 6.1 (Medium) |
| Attack vector | Network (remote) |
| Attack complexity | Low |
| Privileges needed | None |
| User interaction | Required |
| EPSS exploit chance | 1.1% (top 33%) |
| CISA exploited list | No |
| Weakness | CWE-79 |
| Published | 2017-08-09 |
| Last modified | 2026-06-17 |
Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score
Am I affected?
Timeline
- Published CVE record published
- Updated Record last modified
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.
Quick answers
How do I fix CVE-2014-6393?
express: upgrade to newer than 3.10.5. Exact commands for each OS are on this page.
Is CVE-2014-6393 being exploited?
CVE-2014-6393 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.
What does CVE-2014-6393 affect?
CVE-2014-6393 affects express. Severity is medium (CVSS 6.1). The Express web framework before 3.11 and 4.x before 4.5 for Node.js does not provide a charset field in HTTP Content-Type headers in 400 level responses, which might allow remote attackers to conduct cross-site scripting (XSS) attacks via
How urgent is CVE-2014-6393?
Priority 38/100. No elevated risk signals yet.
Software pages
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