Topic starter
07/03/2026 1:39 am
TL;DR: Session hijacking steals post-authentication tokens, letting attackers bypass passwords and MFA after login and move through SaaS environments with inherited permissions, according to Obsidian Security. The control gap is no longer authentication alone, but continuous session governance, token visibility, and behavioural detection.
Editorial analysis by NHI Mgmt Group, based on content published by Obsidian Security: “Session Hijacking: How It Works & How to Stop It”.
By the numbers:
- Session hijacking increased 127% year-over-year in 2026, according to Obsidian Security.
- 87% of successful cyberattacks in 2024 involved session hijacking after valid MFA logins, according to Obsidian Security.
- SpyCloud recovered over 17 billion stolen cookie records from the dark web in 2024, according to Obsidian Security.
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 session hijacking attacks remain effective in SaaS environments?
A: SaaS environments fragment activity across many tools, so a valid session can move through applications without a single unified security checkpoint.
Q: What are the signs that SaaS session hijacking may be underway?
A: Common signs include unusual activity from an otherwise valid session, access from unfamiliar devices or locations, unexpected creation of new sessions, and actions that do not match the user’s normal behavior.
Practitioner guidance
- Audit session-token exposure paths Review where browser cookies, access tokens, and refresh tokens can be stolen through malware, AiTM phishing, XSS, or unencrypted transport, then rank the applications by blast radius.
- Add behavioural session monitoring Alert on new-device logins, unusual geolocation, impossible travel, concurrent sessions, and unexpected data access patterns that appear after valid authentication.
- Inventory OAuth-connected applications Map every SaaS integration, the scopes it holds, and the downstream systems it can reach so a hijacked session does not become an inherited-access event.
Bottom line: Session hijacking exploits the gap between successful login and token governance, which is why MFA can be bypassed without defeating the authentication challenge.
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This topic was modified 4 days ago by NHI Mgmt Group
08/10/2026 4:30 pm
Session governance is now the control boundary that follows authentication. MFA reduces credential reuse, but it does not govern the token that survives the login. That means IAM teams have been treating the wrong artefact as the endpoint of trust, and the practical conclusion is that sessions must be governed with the same seriousness as initial authentication.
Continuous session governance is the missing layer in many IAM programmes. Authentication controls answer who logged in, but they do not answer what that session can do after it starts. Security teams now need to treat session state, token custody, and connected-app trust as one governance problem rather than separate operational tasks.
A question worth separating out:
Q: What should incident response teams do when a SaaS session is compromised?
A: Incident response should remove every persistence vector, not only the IdP session. That means revoking application sessions and tokens, resetting compromised credentials, and checking for new MFA devices, email addresses, or phone numbers attached to the account. Teams should also reduce session timeouts where possible to limit the reach of future session hijacking.
👉 Read our full editorial: Session hijacking exposes the IAM gap left after MFA succeeds