CVE-2026-15638 PUBLISHED

Cryptographic Padding Oracle

Assigner: Delinea
Reserved: 13.07.2026 Published: 15.09.2026 Updated: 16.09.2026

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.

Metrics

CVSS 4.0

CVSS Vector: CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:H/VI:L/VA:N/SC:H/SI:H/SA:H
CVSS Score: 9.1

Exploitability Metrics		Vulnerable System Impact Metrics		Subsequent System Impact Metrics
Attack Vector	Network	Confidentiality	High	Confidentiality	High
Attack Complexity	High	Integrity	Low	Integrity	High
Attack Requirements	Present	Availability	None	Availability	High
Privileges Required	None
User Interaction	None

CVSS 4.0

Product Status

Vendor	Delinea
Product	Secret Server (On-Prem)
Versions	Default: unaffected affected from 10.5.1 to 12.1.3 (incl.)

Solutions

Upgrade to secret server version 12.2.7 or later.

Credits

Aidan Stansfield - Division 5 finder

References

https://delinea.com/security-advisories

Problem Types

CWE-327 Use of a Broken or Risky Cryptographic Algorithm CWE

Impacts

CAPEC-463 Padding Oracle Crypto Attack