CVE-2026-15638

Critical

Description

An unauthenticated user with access to Secret Server could leverage a padding oracle to decrypt or encrypt data using one of the server's cryptographic keys. The key itself is not exposed.

SeverityCritical

CVSS9.1

Exploit probability—

ProductSecret Server (On-Prem)

PublishedSep 16, 2026

First seenSep 16, 2026

Weakness typeCWE-327CWE-327

How to fix

Vendor advisories

delinea.com/security-advisories

Affected products

Product	Affected versions	Fixed in
Delinea Secret Server (On-Prem)	10.5.1 ≤ v ≤ 12.1.3	—

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