# CVE-2026-62903: Microsoft SQL Server authentication bypass in capture-replay

Source: https://junglewise.ai/threats/cve-2026-62903-authentication-bypass-by-capture-replay-in-sql-server-allows-an  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-11-10. Updated: 2026-11-10  
License: CC BY 4.0 with a link back

CVE-2026-62903 · Severity: high · CVSS 7.4 · Published 2026-11-10

SQL Server, a database management system used to store and retrieve business data, contains an authentication bypass vulnerability. An attacker on the network can capture and replay authentication credentials to gain unauthorized access and read sensitive information from the database without proper authorization.

Technologies: [Microsoft SQL Server](https://junglewise.ai/threats/technologies/sql-server). Vendors: [Microsoft](https://junglewise.ai/threats/vendors/microsoft).

## Quick answers

**Is CVE-2026-62903 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-62903 being exploited in the wild.

**How severe is CVE-2026-62903?** High severity, with a CVSS score of 7.4, published 10 November 2026.

**Which products and versions are affected?** Microsoft SQL Server.

**Is there a fix for CVE-2026-62903?** 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-2026-62903 attacked?** It is attacked over the network, in a hosted service.

**Am I affected by CVE-2026-62903?** Check whether you run Microsoft SQL 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 an authentication bypass due to insufficient validation in the capture-replay authentication mechanism in SQL Server. An attacker with network access can intercept and replay captured authentication traffic to authenticate without valid credentials, leading to information disclosure. The issue requires network access but no prior authentication or user interaction.

## Affected products

- Microsoft SQL Server

## Timeline

- 2026-11-10: disclosed

## References

- [https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-62903](https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-62903)

## Related threats

- [Microsoft SQL Server heap-based buffer overflow](https://junglewise.ai/threats/cve-2026-94513-heap-based-buffer-overflow-in-sql-server-allows-an-authorized)
- [Microsoft SQL Server heap-based buffer overflow](https://junglewise.ai/threats/cve-2026-94511-heap-based-buffer-overflow-in-sql-server-allows-an-authorized)
- [Microsoft SQL Server heap buffer overflow](https://junglewise.ai/threats/cve-2026-88111-heap-based-buffer-overflow-in-sql-server-allows-an-authorized)
- [Microsoft SQL Server privilege escalation via exposed method](https://junglewise.ai/threats/cve-2026-84010-exposed-dangerous-method-or-function-in-sql-server-allows-an)
- [Microsoft SQL Server information disclosure via uninitialized resource](https://junglewise.ai/threats/cve-2026-68783-use-of-uninitialized-resource-in-sql-server-allows-an-authorized)