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27/06/2026 1:27 pm
TL;DR: Cloud email environments are being abused through third-party app access, legacy authentication, stolen session cookies, and other indirect channels that bypass inbound email controls, according to Abnormal AI. The real governance gap is that email security, IAM, and app access management are still treated as separate problems when the attack path crosses all three.
NHIMG editorial — here’s why we think this discussion matters
By the numbers:
- When AWS credentials are exposed publicly, attackers attempt access within an average of 17 minutes.
Questions worth separating out
Q: How should security teams handle indirect attacks that bypass inbound email filters?
A: They should treat email as an identity environment and monitor the controls that operate after message delivery.
Q: Why do cloud email environments need IAM controls as well as email security?
A: Because the real compromise often happens through identity state, not the message itself.
Practitioner guidance
- Review delegated mail access grants Catalogue every OAuth app, service integration, and delegated mailbox permission that can read, send, or modify email.
- Eliminate legacy authentication paths Disable older mail protocols that bypass modern authentication controls and verify that exceptions are documented, monitored, and time-limited.
- Treat active sessions as governed credentials Monitor session persistence, impossible-travel patterns, and mailbox actions that occur after authentication.
What to expect at the briefing
Abnormal AI's full briefing covers the operational detail this post intentionally leaves for the source:
- The webinar walkthrough of real side-channel attack paths through third-party application access and legacy authentication.
- Examples of how stolen session cookies and compromised accounts can evade inbound email defenses.
- Practical mitigation ideas for cloud email security teams that need to detect abuse outside the normal inbox.
- The CPE-eligible on-demand format for teams that want to review the material internally.
👉 Watch Abnormal AI's webinar on cloud email side-channel attacks →
Cloud email side-channel attacks: what IAM teams are missing?
Explore further
27/06/2026 2:47 pm
Cloud email is now an identity governance problem, not only an email filtering problem. The article describes attacks that succeed after the message is already inside the environment or never arrive through the inbox at all. That shifts the control question from blocking payloads to governing delegated access, legacy authentication, and session state. Practitioners should treat mailbox access paths as part of the identity programme, not a separate hygiene layer.
A few things that frame the scale:
- 85% of organisations lack full visibility into third-party vendors connected via OAuth apps, according to The State of Non-Human Identity Security.
- In the same research, only 1.5 out of 10 organisations are highly confident in their ability to secure NHIs, which shows how weak the control baseline remains.
A question worth separating out:
Q: Who is accountable when a compromised session cookie is used to abuse a mailbox?
A: Accountability should sit with the teams that own identity governance, mail security, and session management together. A stolen cookie is not just a user issue or an email issue. It is a trust-state issue that requires policy, detection, and revocation ownership across the programme.
👉 Read our full editorial: Cloud email side-channel attacks are bypassing inbound defenses
