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CVE-2026-15640— Authentication Bypass via SAML Response Manipulation

Quick assessment

Affected
Delinea Secret Server (On-Prem)
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

在特定条件下，有效的 SAML IdP 响应可被利用来冒充另一个 Secret Server 用户。

CVSS 9.5 · Critical

Possible ATT&CK Techniques 1 AI

T1110 · Brute Force
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I. Basic Information for CVE-2026-15640

Vulnerability Information
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Vulnerability Title
Authentication Bypass via SAML Response Manipulation
Source: CVE Program / CVE List V5
Vulnerability Description
Under certain conditions a valid SAML IdP response may be used to impersonate another Secret Server user.
Source: CVE Program / CVE List V5
CVSS Information
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
Source: CVE Program / CVE List V5
Vulnerability Type
使用欺骗进行的认证绕过
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
Delinea Secret Server (On-Prem) 10.5.0 ~ 12.1.3 -

II. Public POCs for CVE-2026-15640

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III. Intelligence Information for CVE-2026-15640

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Vendor Advisories for CVE-2026-15640 (1)

Same Patch Batch · Delinea · 2026-09-15 · 3 CVEs total

CVE-2026-15639 9.3 CRITICAL Reflected Cross-Site Scripting
CVE-2026-15638 9.1 CRITICAL Cryptographic Padding Oracle

IV. Related Vulnerabilities

Same product: Secret Server (On-Prem)
Same vendor: Delinea
Same weakness: CWE-290

V. Comments for CVE-2026-15640

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