Type Vulnerability
Authentication bypass by capture-replay in SQL Server allows an unauthorised attacker to disclose information over a network.
Microsoft
Microsoft.Data.SqlClient Information Disclosure Vulnerability
CVE-2026-62903
What this means
This is rated high severity (7.4 out of 10). There is no confirmed exploitation of it yet. Ask IT whether the affected products are in your estate.
Full vendor description
Authentication bypass by capture-replay in SQL Server allows an unauthorized attacker to disclose information over a network.
Scoring and exploitation
7.4/ 10
CVSS 3.1 base scoreHigh
Exploitable over the network without any account, under specific conditions, and no one has to click or open anything. High impact on confidentiality and integrity.
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N
Exploitability
Longer bar: easier to attack
Attack vectorNetworkAV:N
Attack complexityHighAC:H
Privileges requiredNonePR:N
User interactionNoneUI:N
ScopeUnchangedS:U
Impact
Longer bar: more harm
ConfidentialityHighC:H
IntegrityHighI:H
AvailabilityNoneA:N
- Not reported
- Exploited in the wild
- Not confirmed in the
- Not reported
Weaknesses
CWE-294
References
1 link from the CVE record, grouped by site.
msrc.microsoft.com1 link