CVE-2026-15640 Authentication Bypass via SAML Response Manipulation
Attackers can impersonate other users by manipulating valid SAML responses, leading to unauthorized account access in Delinea Secret Server.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-15640?
CVE-2026-15640 is a critical authentication bypass vulnerability in Delinea Secret Server (On-Prem), published on 15 Sep 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
Under certain conditions a valid SAML IdP response may be used to impersonate another Secret Server user.
Weakness: CWE-290
Which versions are affected by CVE-2026-15640?
How do I fix CVE-2026-15640?
No fix has been published for CVE-2026-15640 yet. Limit exposure of the affected software until one is available.
Upgrade, and rotate credentials and sessions that may have been exposed. More about Authentication bypass.
Is CVE-2026-15640 being exploited?
There is no known exploitation of CVE-2026-15640 in the wild and no public exploit code.
Sources
Also known as GHSA-43cm-c736-gj85.