CVE-2026-15638 Cryptographic Padding Oracle
An unauthenticated attacker can exploit a padding oracle to decrypt or encrypt data using server keys, compromising data confidentiality and integrity.
- 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-2026-15638?
CVE-2026-15638 is a critical 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
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.
Weakness: CWE-327
Which versions are affected by CVE-2026-15638?
How do I fix CVE-2026-15638?
No fix has been published for CVE-2026-15638 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-15638 being exploited?
There is no known exploitation of CVE-2026-15638 in the wild and no public exploit code.
Sources
Also known as GHSA-grw7-x4gw-45r5.