Yes. Code-signing certificates are delegated trust objects with a lifecycle, ownership, and revocation requirement, which makes them functionally similar to other non-human identities. If the organisation does not inventory, control, and retire them like credentials, attackers can turn the trust model into an access path.
Why code-signing certificates belong in the machine identity model
Code-signing certificates are not just artifacts for software release. They are trust-bearing credentials that prove software provenance, authorize distribution, and create a durable security boundary around what the platform will accept as legitimate code. That means they have ownership, issuance, protection, renewal, and revocation requirements that look much more like machine identity governance than like a one-time packaging step.
Teams usually go wrong when they treat the certificate as a build detail instead of a controlled credential. Once the private key is exposed, copied, or reused too widely, the certificate can be turned into a signing capability that outlives the original pipeline, release process, or employee who first handled it.
A useful way to frame the issue is that the certificate is the visible trust token, while the private key is the protected identity material. Managing one without the other leaves a gap, because the trust decision is only as strong as the lifecycle controls around issuance, storage, access, and retirement.
How the trust model breaks when certificates are handled like static artifacts
Code-signing certificates create downstream trust in operating systems, browsers, package managers, endpoint policy, and software distribution systems. If teams fail to inventory where they are used, who can access the signing key, and when they must be rotated or revoked, they create a high-value trust path that attackers can abuse after initial compromise. That is why lifecycle discipline matters more than the certificate format itself.
This is also where code signing differs from ordinary encryption. Encryption protects confidentiality; signing asserts authenticity and integrity. A stolen signing key does not just expose data, it can manufacture trust. That makes revocation speed, key protection, and separation of duties central to the control model.
For practitioners, the decisive question is whether the certificate can still authenticate software after the original owner has lost control of it. If the answer is yes, the certificate has effectively become a standing identity with an active privilege, even if the organisation never labelled it that way.
What good governance looks like for signing certificates
Teams should manage code-signing certificates with the same discipline they use for other machine credentials: clear ownership, scoped issuance, protected key storage, periodic review, and defined retirement. That includes knowing which build systems can access the key, which products depend on the certificate, and what the revocation path is if compromise is suspected. Machine Identity, PKI and Certificate Lifecycle Guide is a useful reference for the lifecycle controls that keep signing trust credible.
The trust boundary is not the certificate alone, it is the combination of certificate, private key, and policy around use. NHI terminology and ownership practices help explain why delegated trust objects need governance, even when they are not tied to a person. For teams that need a broader identity lens, Human vs Non-Human Identity clarifies where machine-style controls become the right operating model.
When signing is integrated into CI/CD, the certificate should be treated as production-grade trust infrastructure. That means build access, signing access, and release approval should not collapse into the same broad role set, because a single compromised account should not be able to mint trusted binaries indefinitely.
Risk and Threat Considerations
Code-signing certificates are attractive to attackers because they can turn a compromise into trusted execution. If adversaries obtain the signing key, they can produce software or drivers that appear legitimate to downstream controls, which can extend the blast radius well beyond the original environment.
Failure mechanism: The weak point is usually inadequate key protection, excessive access to the signing environment, or delayed revocation after compromise. Once the signing capability is copied or abused, trust decisions continue to validate attacker-controlled code until the certificate is rotated or revoked everywhere it is trusted.
Impact: The result can be malicious updates, persistent supply chain abuse, blocked remediation, and costly trust recovery. NVIDIA code-signing certificates stolen 2022 and AnyDesk breach 2024 both show why stolen signing trust is operationally serious, not merely administrative.
Standards & Framework Alignment
This section maps relevant standards and security frameworks to the operational risks and controls described in this guidance.
MITRE ATT&CK addresses the attack surface, NIST SP 800-57, NIST SP 800-53 Rev 5 and CIS Controls v8 set the technical controls, and ISO/IEC 27001:2022 defines the regulatory obligations.
| Framework | Control / Reference | Relevance |
|---|---|---|
| NIST SP 800-57 | Key Management | Code-signing certificates depend on key lifecycle, protection and rotation. |
| Recommendation — Apply key lifecycle controls to signing keys, including protection, rotation and destruction. | ||
| NIST SP 800-53 Rev 5 | IA-5 — Authenticator Management | Signing keys and certificates need controlled issuance, storage, rotation and revocation. |
| AC-6 — Least Privilege | Only a narrow set of build and release roles should be able to use signing capability. | |
| Recommendation — Manage signing credentials through strict issuance, storage, rotation and revocation procedures. Restrict signing access to the smallest set of roles that truly need it. | ||
| ISO/IEC 27001:2022 | A.5.17 — Authentication information | Private keys and signing material are authentication information requiring protection and control. |
| Recommendation — Protect signing material with controlled handling, storage and access restrictions. | ||
| CIS Controls v8 | CIS-5 — Account Management | Signing access should be inventoried and assigned to named owners and systems. |
| Recommendation — Inventory and govern every account or system that can use signing credentials. | ||
| MITRE ATT&CK | T1553.002 — Code Signing | Attackers abuse stolen signing material to make malicious code appear trusted. |
| Recommendation — Detect and investigate abuse of signed binaries and trust-bypassing activity. | ||
Practitioner Guidance
What to prioritise: Inventory every active code-signing certificate, identify the private key owner, and verify whether the key sits in HSM-backed or otherwise tightly controlled storage. If you cannot answer who can sign, where, and on what authority, the certificate is already under-governed.
What to verify: Confirm that revocation procedures are tested, not just documented, and that dependent platforms actually consume revocation updates in a reasonable time. For widely distributed software, delayed revocation can leave a compromised certificate useful long after the team believes the issue is closed.
Practitioner takeaway: Treat code-signing certificates as controlled trust credentials with blast radius, not as build metadata. The security objective is to make signing capability observable, limited, and rapidly removable when trust is no longer defensible.
Related resources from NHI Mgmt Group
- How should security teams treat code signing as a trust signal when malware can use stolen certificates?
- How should teams manage code signing certificates as privileged identities?
- What breaks when teams treat certificates or tokens as if they were identities?
- How should security teams govern cryptographic keys and certificates across human and machine identities?
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Reviewed and updated by the NHIMG editorial team on October 12, 2026.
NHI Mgmt Group — the #1 independent authority on Non-Human Identity, IAM, and Agentic AI security. nhimg.org