Microsoft JDBC Driver for SQL Server: Security feature bypass
Summary
The Microsoft JDBC Driver for SQL Server (mssql-jdbc), a Java client library, does not properly verify cryptographic signatures (CWE-347), which allows a security feature to be bypassed. According to the CNA record, an unauthenticated attacker on the network can exploit this without privileges or user interaction, but the attack complexity is high. Successful exploitation can lead to high confidentiality and integrity impact, with no availability impact. The driver is bundled in Java applications, so exposure depends on whether these applications process data from untrusted sources. No exploitation is known.
Affected
- Microsoft JDBC Driver for SQL Server from 1.0.0 before 13.6.0 (CVE record).
- VulDB describes the affected versions as up to 13.5.x; the CNA range is used here.
- Unknown: exact affected-version list in the MSRC advisory (not retrieved).
Fixed in
- Upgrade to version 13.6.0 or later.
- Patch listed in the November 2026 Microsoft Patch Tuesday release.
Workaround
Unknown.
- No vendor-documented workaround was found.
Exploitation
- Exploited in the wild: no evidence found.
- Public exploit: none found.
- Not listed in CISA KEV (per third-party source, not verified directly).
Our recommendation
- Inventory Java applications, build dependencies and vendored JARs for mssql-jdbc versions below 13.6.0 (Maven, Gradle, third-party software). The ODBC driver is a separate product.
- Upgrade to 13.6.0 or later as part of the regular patch cycle; prioritise applications that use Always Encrypted or process data from untrusted parties.
- Check the MSRC advisory for the official affected-version list and monitor CISA KEV for changes.
Information from Microsoft (Patch Tuesday November 2026)
Public exploits
PoC-in-GitHub, Metasploit and Exploit-DB list nothing for this CVE.
Research sources
- Microsoft Security Update Guide: CVE-2026-70003 msrc.microsoft.com
- CVE Record CVE-2026-70003 www.cve.org
- VulDB entry 435311 vuldb.com
- BleepingComputer: Microsoft November 2026 Patch Tuesday www.bleepingcomputer.com
- Microsoft Learn: JDBC driver release notes learn.microsoft.com
- Maven Repository: mssql-jdbc 12.6.1.jre11 mvnrepository.com
Researched and written up in English and German by an AI (Claude by Anthropic) based on NVD, CISA, EPSS and the sources listed. The vendor information is authoritative. Researched on 11 Nov 2026, 01:03.
Original description (NVD)
Improper verification of cryptographic signature in JDBC Driver for SQL Server allows an unauthorized attacker to bypass a security feature over a network.
NVD references (1)
Sources
The tracker combines official, freely usable data sources – updated continuously:
- NVD (NIST) – CVEs, rating (CVSS), affected products
- CISA KEV – vulnerabilities confirmed by CISA as actively exploited
- CISA Vulnrichment – CISA assessment (SSVC) in the official CVE record
- FIRST EPSS – probability of exploitation
- Microsoft MSRC – Patch Tuesday: vulnerabilities, severity, updates
- PoC-in-GitHub – public proof-of-concept repositories
- Metasploit (Rapid7) – modules of the Metasploit Framework
- Exploit-DB (OffSec) – archive of public exploits (links only)
- Patch days: official vendor pages (linked per vendor) (Vendor patch days)
This product uses data from the NVD API but is not endorsed or certified by the NVD. EPSS data © FIRST.org.
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