Microsoft
Microsoft.Data.SqlClient Information Disclosure Vulnerability
At a glance
Low rather than Medium: UK relevance is 40 of 100, little UK-specific signal so far.
Briefing
There is no written leader briefing for this story yet. These questions come from the facts we hold.
Questions to ask IT
- Do we run Microsoft Sql Server, and which versions?
- If it is not yet patched, what mitigation is in place, and will the fix be done by 10 Dec?
Next steps
- Confirm whether this affects systems or suppliers in your estate
Vulnerability facts
Full CVE detail CVE-2026-62903- 7.4 · HighExploitable 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
- Not listed
- Not linked from the CVE record
No technical write-up beyond these facts and the summary below yet.
Next steps
- Review the advisory against your asset inventory and patch cadence
Summary
- Authentication bypass by capture-replay in SQL Server allows an unauthorised attacker to disclose information over a network.
Read the original reportMicrosoft Security Update Guide RSS(opens in a new tab)
Products and services involved
- Microsoft Sql Server96% match confidence · CVE-2026-62903
Pulse
Last change 58m ago · Next recheck 11 Nov 2026, 19:03 UK time
- Story10 Nov 2026, 19:03 UK time · 58m ago
Linked reporting from Microsoft Security Update Guide RSS (vendor psirt).
Read source (Microsoft Security Update Guide RSS)
1 entry so far. The timeline chart appears once this story has more history.
Sources
CVE-2026-62903 Microsoft.Data.SqlClient Information Disclosure Vulnerability
How we know
Statements extracted from sources. Higher confidence means stronger corroboration.
- ClaimedHeadline60% confidence
Microsoft.Data.SqlClient Information Disclosure Vulnerability
- ProbableSummary fact75% confidence
Authentication bypass by capture-replay in SQL Server allows an unauthorised attacker to disclose information over a network.
- ConfirmedCVE identifier95% confidence
Event involves CVE-2026-62903

