CVE-2026-15638 Delinea CVE debrief

Who should care

Defenders responsible for Secret Server instances, cryptographic key management, and data security should assess potential exposure and impact.

Why it matters

CVE-2026-15638 is a critical vulnerability in Secret Server that allows unauthenticated users to decrypt or encrypt data using a server's cryptographic key. Defenders should prioritize verifying exposure, assessing potential impact, and focusing on Secret Server instances and cryptographic key management.

• Potential unauthorized data access or manipulation
• Need for verification of Secret Server instance exposure
• Potential impact on data confidentiality and integrity

Technical summary

CVE-2026-15638 is a critical vulnerability in Secret Server, allowing unauthenticated users to decrypt or encrypt data using a server's cryptographic key via a padding oracle attack. This vulnerability affects Secret Server instances and has significant operational impacts, including potential unauthorized data access or manipulation. Defenders should prioritize verifying exposure, assessing potential impact, and focusing on Secret Server instances and cryptographic key management. The vulnerability's technical details involve a padding oracle attack, which allows

Defensive priority

Defenders should prioritize verifying exposure and assessing potential impact, focusing on Secret Server instances and cryptographic key management.

Recommended defensive actions

• Verify Secret Server instance exposure and configuration
• Assess cryptographic key management and rotation practices
• Monitor for potential unauthorized data access or manipulation

Evidence notes

The CVE record and NVD entry provide details on the vulnerability, but vendor confirmation and additional context are limited. The source-provided CVE metadata and official NIST NVD detail page offer some information, but further verification is necessary to assess exposure and impact. Defenders should verify Secret Server instance exposure, assess cryptographic key management and rotation practices, and monitor for potential unauthorized data access or manipulation. The CVE Program, N

Sources and references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.