Security readout for executives and security teams
Plain-English summary
Older Express applications may send certain error responses without declaring a character set. In some browser and encoding conditions, that can let attacker-controlled text be interpreted as script, creating a cross-site scripting risk. The sources do not provide a CVSS score or evidence of active exploitation.
Executive priority
Treat this as a legacy dependency cleanup item with XSS implications. It should be prioritized for public-facing Node.js services, but the provided evidence does not support emergency response language.
Technical view
CVE-2014-6393 affects Express before 3.11 and Express 4.x before 4.5. The issue is missing charset information in HTTP Content-Type headers for 400-level responses, which may allow XSS through characters interpreted under a non-standard encoding.
Likely exposure
Exposure is most likely in legacy Node.js applications that still run Express versions before 3.11 or 4.x before 4.5 and return user-influenced 400-level responses to browsers.
Exploitation context
The CVE describes a remote XSS possibility, but the provided sources do not show active exploitation, public weaponization, KEV listing, or a complete severity assessment.
Researcher notes
The key condition is missing charset on 400-level Content-Type headers in affected Express versions. Evidence is limited to the CVE description and references; affected package metadata, CVSS, CWE mapping, and exploit telemetry are not provided.
Mitigation direction
- Inventory applications using Express and identify versions below 3.11 or 4.5.
- Upgrade Express to 3.11 or later for 3.x, or 4.5 or later for 4.x.
- Review vendor or framework guidance before applying compensating controls.
- Prioritize internet-facing applications that return browser-rendered error responses.
Validation and detection
- Check dependency manifests and lockfiles for affected Express versions.
- Confirm deployed applications use remediated Express versions, not only source repositories.
- Review 400-level responses for explicit charset handling in non-production testing.
- Run dependency security scanning and verify this CVE is no longer reported.
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
Conservative CVE-to-ATT&CK context
These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.
ATT&CK lookup starting points
Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.
CVE-2014-6393 mapping review
Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.
Open ATT&CK lookup- Severity
- Unknown
- CVSS
- Not scored
- Known Exploited
- No
- Published
CNA and ADP enrichment extracted from CVE v5
These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.
CVSS and timeline data
No CVSS vectors or timeline events were available in the normalized CVE source material.
Source materials
- CVE List V5 sourceCVE List V5
- https://nodesecurity.io/advisories/express-no-charset-in-content-type-headerCVE reference · x_refsource_CONFIRM
- https://bugzilla.redhat.com/show_bug.cgi?id=1203190CVE reference · x_refsource_CONFIRM
Products and packages named in the record
CWE details
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.