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12/06/2026 9:42 pm
TL;DR: Copilot inherits Microsoft 365 permissions and labels from day one, and Cyera says 40% of data goes mislabeled while an employee can have access to more than 23,000 sensitive files, making AI exposure a governance problem before it is a model problem. Loose classification, stale policy coverage, and incomplete remediation turn Copilot rollouts into an identity and data-control test.
NHIMG editorial — based on content published by Cyera: How to Find and Fix Mislabeled Sensitive Data Before Enabling Microsoft Copilot
By the numbers:
- 40% of data goes mislabeled, which means the actions tied to them are unreliable.
Questions worth separating out
Q: What breaks when Copilot inherits inaccurate Microsoft 365 labels?
A: When Copilot inherits inaccurate Microsoft 365 labels, its summaries, restrictions, and surfaced content are driven by unreliable metadata.
Q: Why do mislabeled files create AI governance risk in Microsoft 365?
A: Mislabeled files create AI governance risk because Copilot uses the existing data state to decide what to expose and what to restrict.
Q: How can security teams tell whether Copilot readiness is actually improving?
A: Security teams should measure the share of files with verified labels, the number of unlabeled sensitive documents, and whether downstream controls fire correctly after relabelling.
Practitioner guidance
- Audit label accuracy across Microsoft 365 Run a file-level review of OneDrive, SharePoint, and Exchange to identify mislabelled, unlabeled, and incorrectly scoped sensitive content before expanding Copilot access.
- Prioritise high-reach content paths Focus first on the folders and repositories that expose the largest volumes of sensitive material, because broad inherited access creates the biggest Copilot blast radius.
- Tie MIP labels to downstream control tests Confirm that DLP, encryption, retention, and Copilot location restrictions all trigger correctly after labels are updated, then rescan to verify the control state changed.
What's in the full article
Cyera's full article covers the operational detail this post intentionally leaves for the source:
- How the free Copilot Risk Report scans OneDrive, SharePoint, and Exchange without agents or production impact
- The file-by-file methodology used to distinguish correctly labeled, mislabeled, and unlabeled content
- How Cyera applies Microsoft Information Protection labels through Microsoft Graph and supports bulk approval for edge cases
- The remediation workflow that closes issues after rescans confirm the labels are in place
👉 Read Cyera's analysis of Copilot readiness and mislabeled M365 data →
M365 label accuracy and Copilot risk: what IAM teams need now?
Explore further
12/06/2026 11:58 pm
Copilot readiness is really label governance readiness. The article’s core point is that Microsoft 365 AI inherits the current state of permissions and sensitivity labels, so AI exposure is a reflection of existing governance quality, not a separate AI problem. When 40% of data is mislabeled, the organisation is effectively asking Copilot to operate on unreliable control signals. The implication is that AI rollout decisions now depend on the accuracy of identity-linked data governance.
A few things that frame the scale:
- From our research: The average estimated time to remediate a leaked secret is 27 days, despite 75% of organisations expressing strong confidence in their secrets management capabilities, according to The State of Secrets in AppSec.
- Only 44% of developers are reported to follow security best practices for secrets management, exposing a significant developer behaviour gap, according to The State of Secrets in AppSec.
A question worth separating out:
Q: Who should own Copilot data governance across identity and security teams?
A: Ownership should sit across IAM, data security, and compliance because the risk spans permissions, classification, and policy enforcement. Copilot changes the boundary between identity and data governance, so one team cannot validate readiness alone. The right model is shared accountability with a single remediation queue.
👉 Read our full editorial: Copilot inherits mislabeled M365 data risk from day one
