CVE-2026-15638
CriticalCVSS 9.1Exploitation Probability (EPSS)
Low risk10th percentile - higher than 10% of all known CVEs
Summary
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.
Risk Assessment
An attacker may decrypt or modify data protected by the server, potentially leading to disclosure of confidential information or data integrity compromise.
Recommendation
Apply the vendor's available patches for Secret Server addressing the padding oracle vulnerability. Until the fix is deployed, consider restricting access to vulnerable interfaces.
Other vulnerabilities in Secret Server
See all- CVE-2026-15640Critical
Under certain conditions a valid SAML IdP response may be used to impersonate another Secret Server user. The vulnerability affects the SAML authentication mechanism.
- CVE-2026-15639Critical
An attacker can craft a malicious link that, if used by a legitimate user, may cause the user's browser to run JavaScript supplied by the attacker. The vulnerability affects the link processing mechanism.
- CVE-2026-115830High
In Secret Server versions earlier than 12.3.1, a user under certain conditions could submit an unsigned JWT and receive cloudadmin permissions in response. The vulnerability allows privilege escalation to administrative level.
- CVE-2026-115829High
In Secret Server versions earlier than 12.3.1, a user could bypass the initial login step and authenticate by successfully negotiating only the second factor login step. The vulnerability bypasses the first authentication factor.
- CVE-2026-115828Medium
In Secret Server versions earlier than 12.3.1, the application did not always validate the PIN or biometric check when using a FIDO2-compliant device. This may allow bypassing the additional second-factor verification.
Original NVD description (English source)
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.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS