Vulnerability · Published Sep 15, 2026 · Assigned by Delinea
CVE-2026-15640Authentication Bypass via SAML Response Manipulation
Critical 9.5
In plain English
A critical-severity authentication bypass by spoofing in Secret Server (On-Prem) from Delinea. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 24% of all known vulnerabilities).
Severity (CVSS 4.0)9.5Critical
Exploit odds (30 days)0.3%top 75.6% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known
Official description
Under certain conditions a valid SAML IdP response may be used to impersonate another Secret Server user.
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| Delinea | Secret Server (On-Prem) | 10.5.0 – through 12.1.3 |
Weakness: CWE-290 · Vector: CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:H/VI:H/VA:N/SC:H/SI:H/SA:H
References
- https://delinea.com/security-advisories vendor-advisory