M&A identity risk: are your controls keeping pace with deals?

TL;DR: Mergers and acquisitions create five identity risk inflection points, from pre-acquisition visibility gaps to post-close sprawl, where orphaned accounts, overprovisioned access, and temporary trust can become durable exposure, according to Delinea. The central issue is that deal-speed assumptions outpace identity governance, so access decisions harden before teams can verify them.

NHIMG editorial — based on content published by Delinea: 5 critical steps to strengthen cybersecurity in M&A

By the numbers:

• 97% of NHIs carry excessive privileges, increasing unauthorised access and broadening the attack surface.
• 91% of former employee tokens remain active after offboarding, leaving organisations vulnerable to potential security breaches.

Questions worth separating out

Q: How should security teams assess identity risk before an acquisition closes?

A: They should compare documented access with live entitlements across human, privileged, and non-human identities.

Q: Why do mergers and acquisitions increase IAM and NHI risk so quickly?

A: Because access often expands faster than governance can consolidate.

Q: What breaks when identity reviews are only done at a single point in the deal cycle?

A: Static reviews miss the fact that access changes during and after close.

Practitioner guidance

• Baseline actual access before diligence closes. Compare documented entitlements with live directory, SaaS, and privileged access records before approval.
• Treat interim access as time-bounded governance. Assign an owner, expiry condition, and revalidation trigger to every temporary cross-company permission so the access does not survive the acquisition phase by default.
• Re-certify privileged and non-human identities after integration milestones. Review service accounts, API keys, integrations, and admin roles once systems are merged, because the acquisition process often changes business purpose before the technical control plane is updated.

What's in the full article

Delinea's full blog covers the operational detail this post intentionally leaves for the source:

• Phase-by-phase M&A security checkpoints for pre-acquisition, during-acquisition, and post-acquisition review
• Practical checklists for identity discovery, access consolidation, and post-close monitoring
• Examples of where identity debt accumulates across inherited applications and privileged access paths
• The article's own framing of how CISOs can preserve continuity without embedding long-term exposure

👉 Read Delinea's full guide to cybersecurity in mergers and acquisitions →

M&A identity risk: are your controls keeping pace with deals?

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