Medium severityC#Insecure ConfigurationMEDIUM confidence
Insecure Cookie Flags
A cookie is configured without protective flags (Secure/HttpOnly off, or SameSite=None), exposing it to interception over HTTP, theft via XSS, and cross-site sending (CWE-614/CWE-1004/CWE-1275).
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
options.HttpOnly = false;Passes - the safe pattern
options.HttpOnly = true;Why it matters & how to fix it
A cookie is configured without protective flags (Secure/HttpOnly off, or SameSite=None), exposing it to interception over HTTP, theft via XSS, and cross-site sending (CWE-614/CWE-1004/CWE-1275). Set Secure = true, HttpOnly = true, and SameSite = Strict/Lax for session and auth cookies.
References
Rule ID integsec.csharp.insecure-config.insecure-cookie-flags - engine: Opengrep - license: MIT - Copyright (c) IntegSec Inc.
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