Medium severityJavaScript / TypeScriptInsecure ConfigurationMEDIUM confidence
Insecure Session Cookie Config
An express-session cookie is configured without the Secure flag or with SameSite=None, exposing the session cookie to interception or cross-site sending.
Standards mapping
- CWE
- CWE-614: Sensitive Cookie in HTTPS Session Without 'Secure' AttributeCWE-1004: Sensitive Cookie Without 'HttpOnly' Flag
- OWASP Top 10
- A05:2021 - Security Misconfiguration
- OWASP ASVS
- V3.4.1 (L1)V3.4.2 (L1)
Vulnerable vs. safe
Flagged by this check
app.use(session({ secret: s, cookie: { secure: false } }));Passes - the safe pattern
app.use(session({ secret: s, cookie: { secure: true, httpOnly: true, sameSite: "lax" } }));Why it matters & how to fix it
An express-session cookie is configured without the Secure flag or with SameSite=None, exposing the session cookie to interception or cross-site sending. Set cookie { secure: true, httpOnly: true, sameSite: 'lax' }.
References
Rule ID integsec-js-insecure-session-cookie-config - engine: Opengrep - license: MIT - Copyright (c) IntegSec Inc.
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