Topic starter
19/08/2026 3:55 pm
TL;DR: Session hijacking steals authenticated browser sessions through stolen cookies or tokens, bypassing passwords and MFA while making AiTM phishing kits and infostealers a mainstream intrusion path, according to Push Security. For identity teams, the problem is no longer login strength alone but control over session visibility, token theft detection, and unmanaged access paths.
Editorial analysis by NHI Mgmt Group, based on content published by Push Security: “Session hijacking”.
Key questions
Q: What breaks when attackers can steal MFA session tokens?
A: MFA stops being the control point once the attacker has a valid token or cookie.
Q: Why do AiTM phishing kits make session hijacking harder to stop?
A: AiTM kits proxy the real login flow and capture the session after the victim completes authentication, so the attacker inherits the trusted session rather than trying to crack credentials.
Q: What are the signs that session token theft is happening?
A: Look for session replay from unusual browser telemetry, odd user agent changes, and access that continues without a fresh authentication event.
Practitioner guidance
- Map session visibility gaps Identify which applications issue reusable session cookies or tokens and which browser paths your team can actually observe from authentication through replay.
- Instrument browser-side detection Add telemetry that can flag suspicious token theft, unusual user agent behaviour, and replay patterns inside the browser workflow.
- Reduce unmanaged access paths Prioritise high-risk browser workflows that bypass managed devices, especially where shadow SaaS or personal endpoints can hold active sessions.
Bottom line: Session hijacking succeeds because the attacker steals the trusted session artefact, not the password, so MFA alone cannot close the gap.
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19/08/2026 4:31 pm
Session hijacking is now an identity governance problem, not just a phishing problem. Once an attacker holds a valid token or cookie, the access path is already authorised and many traditional authentication controls have done their job exactly as designed. The failure sits in post-authentication visibility, session lifecycle control, and the inability of many programmes to see the browser as an identity enforcement point. Practitioners should treat the session as a governed identity state, not a by-product of login.
A few things that frame the scale:
- Only 5.7% of organisations have full visibility into their service accounts, according to the Ultimate Guide to NHIs.
A question worth separating out:
Q: What should teams do when a stolen browser session is suspected?
A: Contain the session before the attacker can reuse it. Revoke or invalidate the token, review recent consent grants and browser activity, check for extension abuse, and examine whether the account was used to access administrative or data-heavy applications. The goal is to stop replay and identify what the session already touched.
👉 Read our full editorial: Session hijacking through compromised tokens is reshaping AI security