How should organisations secure electronic signing workflows against identity fraud and forged approvals?

Organisations should treat electronic signing as a controlled identity workflow, not just a convenience feature. Add authentication before signing, use identity verification for sensitive documents, and keep a verifiable record of who signed, when, and what was signed. A secure platform should limit access to the sender and recipient, reducing the chance of interception, tampering, or forgery.

Why signing workflows fail when approval is treated as a formality

Electronic signing becomes vulnerable when the workflow proves possession of a session, not the authority of the signer. That gap shows up when links are forwarded, inboxes are compromised, or approvers can be impersonated with enough context to satisfy a weak workflow. The control objective is to make signing an attributable act with a clear trust boundary, not a convenience click.

For sensitive documents, the strongest protection is to require the signer to re-establish identity at the point of approval, especially when the document has legal, financial, or contractual impact. A platform should also bind the approval to a specific document version, because a valid signature on the wrong payload is still a control failure.

Secure signing is therefore about three things at once: proving who acted, proving what they approved, and preventing the approval channel from being quietly redirected. That is why many organisations pair workflow controls with stronger identity assurance and audit evidence, rather than relying on email access alone.

Controls that reduce identity fraud and forged approvals

Start with step-up authentication for the signing event, then layer in identity verification where the consequence of misuse is high. If the same user can review and sign without any additional proof, the process is easy to automate, but it is also easier to abuse through account takeover or delegated access abuse.

Limit the signing platform so only the intended sender and recipient can access the document package, and ensure the system records the signer, timestamp, document hash, and approval action in a way that can be independently reviewed later. Those records are only useful if they are resistant to alteration and can be matched back to the exact document state that was signed.

Use step-up authentication before approval, not just before login.
Require stronger identity proofing for high-value, regulated, or externally binding documents.
Bind signatures to the final document version and preserve an immutable audit trail.
Restrict document access to the minimum set of parties needed for the workflow.

Where the workflow supports it, treat signing authority as a privilege that can expire or be scoped to a specific transaction. That reduces the blast radius if an account, inbox, or approval channel is compromised.

Risk and Threat Considerations

Electronic signing workflows are attractive to attackers because they convert identity compromise into business action, often without needing malware or deep system access. Forged approvals, inbox compromise, and social engineering can all produce a signature that looks legitimate unless the platform enforces strong identity checks and document binding.

Failure mechanism: An attacker gains access to the user’s email, portal session, or approval channel, then uses that foothold to approve a document, redirect the envelope, or exploit weak verification to impersonate the signer.

Impact: The organisation may accept a contract, payment instruction, policy change, or other binding action that it cannot reliably repudiate after the fact, creating legal, financial, and operational exposure.

Standards & Framework Alignment

This section maps relevant standards and security frameworks to the operational risks and controls described in this guidance.

CIS Controls v8, NIST CSF 2.0 and NIST SP 800-63 set the governance and control requirements practitioners need to meet.

Framework	Control / Reference	Relevance
CIS Controls v8	5 — Account Management	Signing approvals depend on controlled account access and revocation.
	6 — Access Control Management	The workflow must enforce who may access, sign, and delegate approval.
	8 — Audit Log Management	A verifiable signing trail is essential to prove who signed what and when.
Recommendation — Restrict and revoke signing access promptly for accounts no longer authorised to approve documents. Enforce least privilege so only approved parties can access and execute signing actions. Log signing events with immutable evidence for signer, timestamp, and document version.
NIST CSF 2.0	PR.AA — Identity Management, Authentication, and Access Control	Electronic signing hinges on authentication and access control before approval.
	PR.DS — Data Security	The signed document and its integrity must be protected from tampering.
	DE.CM — Continuous Monitoring	Signing workflows need detection of abnormal access and approval behaviour.
Recommendation — Require strong authentication and access checks before allowing approval actions. Protect document integrity so approvals remain bound to the exact content signed. Monitor signing activity for unusual access, delegation, or approval patterns.
NIST SP 800-63	Digital Identity Guidelines	Step-up authentication and identity proofing map directly to signer assurance.
	IAL — Identity Assurance Level	Sensitive signers may need higher assurance before approval is accepted.
	AAL — Authenticator Assurance Level	Signing should use strong authenticators at the point of approval.
Recommendation — Apply phishing-resistant authentication and stronger proofing for high-risk signing events. Set the identity assurance level according to the value and sensitivity of the signing action. Require stronger authenticators for approval actions than for routine portal access.

Practitioner Guidance

What to prioritise: Focus first on the signing events that create external obligation or high-value internal approval. Those are the places where a stolen inbox or reused session is most likely to become a material business incident.

What to verify: Before trusting the control, verify that the platform can prove signer identity, document integrity, and signer intent for the exact version approved. If any of those three is missing, the workflow is not truly a controlled signing process.

Practitioner takeaway: The goal is not to make signing harder everywhere, it is to make the final approval step hard to counterfeit, easy to audit, and narrow enough that compromise of one channel does not automatically become forged authority.