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CVE-2026-19117 – FIDO2 Authentication Bypass – Delinea Secret Server (On-Prem) 10.6.0–12.1.2

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Summary

CVE-2026-19117 is a critical authentication bypass vulnerability (CWE-290, spoofing) in Delinea Secret Server on-premises deployments. Under specific conditions, an attacker can register an attacker-controlled FIDO2 credential against a target account and subsequently authenticate as that user, gaining full account takeover without prior credentials or user interaction. The issue carries a CVSS v3.1 base score of 9.8 (Critical) and affects on-prem installations only — cloud/SaaS deployments are not impacted.

Technical details

  • Root cause: Secret Server’s FIDO2 credential registration process does not adequately validate that a credential registration request legitimately originates from the account owner, allowing an attacker to bind their own FIDO2 authenticator to another user’s account.
  • Trigger conditions: Exploitation requires "specific conditions" during the FIDO2 registration flow (exact prerequisites not disclosed by the vendor).
  • Attack vector: Network-based; no privileges and no user interaction required (AV:N/AC:L/PR:N/UI:N).
  • Impact: Full compromise of confidentiality, integrity, and availability — an attacker who successfully registers a spoofed FIDO2 credential can authenticate as the targeted user, potentially including privileged accounts, and access all secrets managed by that account.

Affected software

  • Delinea Secret Server (On-Prem, Windows) 10.6.0 through 11.7.61
  • Delinea Secret Server (On-Prem, Windows) 11.8.0 through 11.8.1
  • Delinea Secret Server (On-Prem, Windows) 11.9.0 through 11.9.47
  • Delinea Secret Server (On-Prem, Windows) 12.0.0 through 12.0.22
  • Delinea Secret Server (On-Prem, Windows) 12.1.0 through 12.1.2

Severity

CVSS v3.1 Base Score: 9.8 (Critical)
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Mitigation and recommended actions

  • Immediate: Upgrade to Secret Server version 12.2.7 or later.
  • Alternative hotfixes: If unable to move to 12.2.7, apply the corresponding hotfix for your branch: 12.1.3, 12.0.23, 11.9.48, 11.8.2, or 11.7.62.
  • Legacy versions: Deployments on versions prior to 11.7 are no longer supported for a direct hotfix and should be upgraded to a currently supported, patched release.
  • Review FIDO2 credential registrations on affected instances for any unrecognized or unexpected authenticators bound to sensitive accounts following patching.

How IONIX identifies potentially affected assets

IONIX matches the following signals against data already collected when it crawled the asset; identifying the technology sends no request beyond that crawl.

  • Set-Cookie response header: Thycotic_Embedded=

References

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IONIX transforms real-world PoCs into safe, non-intrusive test payloads that can be run in production environments without disruption. These simulations are precisely targeted to the systems that are vulnerable, ensuring rapid validation without unnecessary load.

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Results are routed through integrations with ticketing, SOAR, and SIEM tools. Issues are written in plain language, bundled into remediation clusters, and prioritized based on asset criticality, exploitability, and blast radius. This shortens mean time to remediation (MTTR) and empowers teams to act with confidence.

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