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Security Advisories: MDE2OlNlY3VyaXR5QWR2aXNvcnlHSFNBLWMzbTgteDNjZy1xbTJj

Configuration Override in helmet-csp

Versions of helmet-csp before to 2.9.1 are vulnerable to a Configuration Override affecting the application's Content Security Policy (CSP). The package's browser sniffing for Firefox deletes the default-src CSP policy, which is the fallback policy. This allows an attacker to remove an application's default CSP, possibly rendering the application vulnerable to Cross-Site Scripting.


Upgrade to version 2.9.1 or later. Setting the browserSniff configuration to false in vulnerable versions also mitigates the issue.

Source: GitHub Advisory Database
Origin: Unspecified
Severity: Moderate
Classification: General
Published: about 3 years ago
Updated: 9 months ago

CVSS Score: 6.5
CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N

Identifiers: GHSA-c3m8-x3cg-qm2c

Affected Packages

Versions: >= 1.2.2, < 2.9.1
Fixed in: 2.9.1