Summary
Impact: Security Feature Bypass. Microsoft rating: Important. Not known to be exploited — Exploitation Less Likely. Customer action: Required.
Details
How could an attacker exploit this vulnerability?
An attacker who controls or can impersonate the SQL Server could replay a legitimate attestation response while substituting attacker-controlled key material during a client connection. Successful exploitation could allow the attacker to obtain column encryption keys and access or modify protected database data.
According to the CVSS metric, the attack complexity is high (AC:H). What does that mean for this vulnerability?
Successful exploitation requires Always Encrypted with secure enclaves to use HGS attestation. The attacker must also control or impersonate the SQL Server connection and have access to a legitimate attestation response that can be replayed.
What could an attacker accomplish by exploiting this vulnerability?
Successful exploitation could allow an attacker to bypass secure-enclave attestation, obtain column encryption keys, decrypt protected database data, and create modified encrypted data that the client accepts as valid.
Security updates
13.6.0 — https://learn.microsoft.com/en-us/sql/connect/jdbc/release-notes-for-the-jdbc-driver?view=sql-server-ver17&viewFallbackFrom=sql-serve%E2%80%A6
Vulnerabilities 1
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High 8.7
JDBC Driver for SQL Server Security Feature Bypass Vulnerability
Improper verification of cryptographic signature in JDBC Driver for SQL Server allows an unauthorized attacker to bypass a security feature over a network.
Revision history
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#1
Information published.
References
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CVE-2026-70003 JDBC Driver for SQL Server Security Feature Bypass Vulnerability - HTML
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-70003
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Microsoft Exploitability Index
https://www.microsoft.com/en-us/msrc/exploitability-index?rtc=1
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Microsoft Support Lifecycle
https://support.microsoft.com/lifecycle
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Common Vulnerability Scoring System
https://www.first.org/cvss