Quick answers
- Is CVE-2026-15638 exploited in the wild?
- No. Junglewise Threat Intelligence has no report of CVE-2026-15638 being exploited in the wild.
- How severe is CVE-2026-15638?
- Informational severity, with a CVSS score of 0, published 16 September 2026.
- Which products and versions are affected?
- Delinea Secret Server.
- Is there a fix for CVE-2026-15638?
- No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.
- How is CVE-2026-15638 attacked?
- It is attacked over the network.
- Am I affected by CVE-2026-15638?
- Check whether you run Delinea Secret Server. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.
Technical details
The vulnerability is a padding oracle attack against Secret Server's cryptographic implementation. An unauthenticated attacker with network access to the affected server can craft malicious requests to observe responses that leak information about the padding of encrypted data, enabling decryption or encryption of arbitrary data using the server's cryptographic keys without direct key exposure. The attack requires the ability to send multiple requests and observe response patterns, but does not require authentication. Patches should be available from Delinea.
Affected products
- Delinea Secret Server
Timeline
- 2026-09-16: disclosed