What is CVE-2026-62903?

CVE-2026-62903 is a high-severity vulnerability in Microsoft Microsoft.data.sqlclient 6.1, classified under Authentication Bypass by Capture-replay. CVSS score: 7.4/10. Published 2026-11-10.

How severe is CVE-2026-62903?

High severity. CVSS v3 base score is 7.4 out of 10.

Vulnerability in Microsoft Microsoft.data.sqlclient 6.1

CVE-2026-62903

Authentication bypass by capture-replay in SQL Server allows an unauthorized attacker to disclose information over a network.

Published 2026-11-10 · last modified 2026-11-10.

CVSS v3 metric

CVSS v3 base score 7.4 (High). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N.

EPSS exploit prediction

No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.

Affected products

Weakness classification (CWE)

CWE-294 — Authentication Bypass by Capture-replay

References

msrc.microsoft.com/update-guide/vulnerability/CVE-2026-62903 (vendor-advisory, patch)

Frequently asked questions

What is CVE-2026-62903?: CVE-2026-62903 is a high-severity vulnerability in Microsoft Microsoft.data.sqlclient 6.1, classified under Authentication Bypass by Capture-replay. CVSS score: 7.4/10. Published 2026-11-10.
How severe is CVE-2026-62903?: High severity. CVSS v3 base score is 7.4 out of 10.