PatchSiren

PatchSiren cyber security CVE debrief

CVE-2026-15640 Delinea CVE debrief

A critical vulnerability, CVE-2026-15640, exists in Delinea Secret Server. Under certain conditions, a valid SAML IdP response may be used to impersonate another user. This vulnerability has a CVSS score of 9.5, indicating critical severity. It was published on 2026-09-16T00:17:03.577Z and last modified on 2026-09-18T19:34:36.657Z. Defenders should assess exposure, verify user authentication and authorization mechanisms, and confirm vendor remediation. The CVE record and NVD detail page provide additional information.

Vendor
Delinea
Product
Secret Server (On-Prem)
CVSS
CRITICAL 9.5
CISA KEV
Not listed in stored evidence
Original CVE published
2026-09-16
Original CVE updated
2026-09-18
Advisory published
2026-09-16
Advisory updated
2026-09-18

Who should care

Defenders responsible for Secret Server deployments, especially those using SAML IdP responses for authentication, should assess exposure and verify vendor remediation.

Why it matters

CVE-2026-15640 is a critical vulnerability in Delinea Secret Server that allows impersonation via a valid SAML IdP response. Defenders should prioritize verifying user authentication and authorization mechanisms, assess exposure in Secret Server deployments, and verify vendor remediation.

  • Potential impersonation of Secret Server users
  • Authentication and authorization mechanism verification required
  • Vendor remediation and patching necessary

Technical summary

CVE-2026-15640 is a critical vulnerability in Delinea Secret Server that allows impersonation via a valid SAML IdP response, with a CVSS score of 9.5. It requires immediate attention, especially for those using SAML IdP responses for authentication. Defenders should verify user authentication and authorization mechanisms, assess exposure in Secret Server deployments, and verify vendor remediation.

Defensive priority

Defenders should prioritize verifying user authentication and authorization mechanisms, especially those using SAML IdP responses. They should assess exposure in Secret Server deployments and verify vendor remediation.

Recommended defensive actions

  • Verify user authentication and authorization mechanisms
  • Assess exposure in Secret Server deployments
  • Verify vendor remediation

Evidence notes

The CVE record and NVD detail page provide limited information about the vulnerability. The vendor, Delinea, has a security advisory page that may contain additional details.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-15640 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-15640

    CVE Program - Official CVE Program record with source-provided CVE metadata.

  • CVE-2026-15640 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-15640

    NIST National Vulnerability Database - Official NIST NVD detail page and source-specific vulnerability assessment.

Supplemental references

  • Source reference

    Unverified legacy reference

    URL: https://delinea.com/security-advisories

    1443cd92-d354-46d2-9290-d812316ca43a

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.