Because tokens are issued after authentication and often remain valid independently of later password or MFA updates. Unless the organisation revokes the token itself, the attacker can continue using the bearer credential until it expires or is explicitly invalidated. That is why token lifecycle control matters more than login hardening alone.
Why This Matters for Security Teams
Stolen tokens are dangerous because they behave like standing access, not like a password that becomes useless after a reset. Password changes and MFA updates only affect the login event; they do not automatically invalidate bearer tokens already issued to applications, agents, or users. That gap is why token theft frequently outlives the incident that triggered the response, especially when tokens are copied into code, chat tools, or ticketing systems.
NHIMG research shows how common that exposure has become: 44% of NHI tokens are exposed in the wild, and 91% of former employee tokens remain active after offboarding, according to the The 2025 State of NHIs and Secrets in Cybersecurity. In practice, that means a reset can close one path while the attacker keeps the other. The pattern is visible in incidents such as the Salesloft OAuth token breach, where token-based access remained the real risk surface.
Current guidance suggests organisations should treat tokens as independently governed credentials, not as extensions of the user password. In practice, many security teams encounter token abuse only after lateral access has already occurred, rather than through intentional lifecycle controls.
How It Works in Practice
A token is usually issued after authentication and then validated by the target service on its own terms. If the service trusts that token until expiry, the attacker inherits that trust even when the original password changes. MFA changes work the same way: they harden the next sign-in, but they do not retroactively revoke a bearer credential that already exists.
That is why effective response depends on token lifecycle control. Security teams should identify where tokens are minted, where they are stored, and which system can revoke them. For human identities, that often means revoking active sessions, invalidating refresh tokens, and forcing reauthentication. For NHIs, it means rotating the secret, expiring the token family, and checking every integration that might reuse it. The The 52 NHI breaches Report shows how often identity failures become breach amplifiers when credentials are overused or duplicated.
Useful controls include:
- Short token TTLs with automatic renewal only when policy still passes.
- Centralised revocation for access tokens, refresh tokens, and API keys.
- Session invalidation after password resets, offboarding, or risk events.
- Secret scanning plus automated rotation for anything found in code or chat.
- Context-aware access checks so a stolen token cannot be reused from a new location or device without challenge.
The technical direction is consistent with modern identity guidance and with current incident reporting from Anthropic — first AI-orchestrated cyber espionage campaign report, which reinforces how automation can chain access once a credential is accepted. These controls tend to break down when legacy applications validate long-lived tokens locally because revocation never reaches the downstream service.
Common Variations and Edge Cases
Tighter token controls often increase operational overhead, requiring organisations to balance revocation speed against service uptime and integration stability. That tradeoff is real, especially in environments with many third-party connectors, service accounts, or mobile clients that cache credentials.
One common edge case is refresh-token handling. Some teams assume rotating the password is enough because fresh access tokens will eventually stop working, but a valid refresh token can keep minting new access tokens long after the password change. Another is offline or cached validation, where an application accepts a token without checking a central authority. In those cases, even perfect IAM hygiene at the identity provider does not stop reuse at the edge.
There is also no universal standard for this yet across every protocol and product, so best practice is evolving. For example, some environments rely on continuous access evaluation, while others still depend on manual revocation lists or coarse session expiry. The most resilient approach is to pair short-lived credentials with explicit revocation hooks and strong secret governance, as highlighted in the Guide to the Secret Sprawl Challenge and the Anthropic — first AI-orchestrated cyber espionage campaign report.
For NHI-heavy estates, the practical lesson is simple: if a token can outlive the event that should have killed it, a password reset will not save you.
Standards & Framework Alignment
This section maps relevant standards and security frameworks to the operational risks and controls described in this guidance.
OWASP Non-Human Identity Top 10 address the attack and risk surface, while NIST CSF 2.0 and NIST AI RMF set the governance and control requirements practitioners need to meet.
| Framework | Control / Reference | Relevance |
|---|---|---|
| OWASP Non-Human Identity Top 10 | NHI-03 | Token lifecycle and rotation failures are central to this issue. |
| NIST CSF 2.0 | PR.AC-1 | Identity and access controls must limit use of stolen bearer credentials. |
| NIST AI RMF | Governance should address credential persistence across automated systems. |
Enforce least privilege and session invalidation so compromised tokens cannot persist after resets.
Related resources from NHI Mgmt Group
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Reviewed and updated by the NHIMG editorial team on May 27, 2026.
NHI Mgmt Group — the #1 independent authority on Non-Human Identity, IAM, and Agentic AI security. nhimg.org
