Session management best practices
Once a user logs in, the session is what keeps them logged in. If session tokens are predictable, never expire or are exposed in URLs, an attacker can take over accounts without ever knowing a password.
How it happens
Common weaknesses include short or predictable session IDs, not issuing a new session ID at login (session fixation), putting tokens in URLs where they end up in logs and Referer headers, and sessions that stay valid forever.
Why it matters
- Account takeover without credentials.
- Tokens leaking through logs, browser history and third-party sites.
- Stolen sessions staying valid long after the user leaves.
How to prevent it
- Generate long, random session IDs with a secure generator.
- Issue a new session ID after login and privilege changes.
- Never put session tokens in URLs.
- Enforce idle and absolute timeouts, and invalidate sessions on logout.
How Vooki Pro helps
- Tests for tokens in URLs, weak or low-entropy session IDs, session fixation, missing expiry and concurrent sessions.
- Checks cookie flags for every session cookie.
- Warns you when a scan's own login session looks invalid, so you know authenticated coverage was real.
- Scans authenticated areas with auth profiles and automatic re-login.
Frequently asked questions
What is session fixation?
An attacker sets a known session ID for the victim before login. If the application keeps the same ID after login, the attacker shares the session.
How long should a session last?
Use an idle timeout (often 15–30 minutes for sensitive apps) and an absolute timeout, and invalidate sessions on logout.
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Related: Secure cookie flags: Secure, HttpOnly and SameSite · Login and password security best practices