EUVD-2026-73377
GHSA-hx68-h5c3-vvjp
Severity by source
AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Network-accessible TDS listener, low-privilege SQL login required (PR:L), no configuration prerequisites; full C/I/A impact upon successful privilege escalation within the database engine.
Primary rating from Vendor (microsoft).
CVSS VectorVendor: microsoft
Lifecycle Timeline
3DescriptionCVE.org
Improper privilege management in SQL Server allows an authorized attacker to elevate privileges over a network.
AnalysisAI
Privilege escalation in Microsoft SQL Server (versions 2017, 2019, 2022, and 2025) allows a low-privileged authenticated user to elevate their database permissions to a higher role over the network via CWE-269 improper privilege management. With a CVSS 8.8 score and vector AV:N/AC:L/PR:L, the flaw requires only a valid SQL Server login - no attack complexity, no user interaction - and yields full confidentiality, integrity, and availability impact on the database instance. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | A valid SQL Server login with at minimum low-privilege access (PR:L per CVSS) is required; unauthenticated exploitation is not possible. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 8.8 vector (AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H) accurately reflects the threat profile: the flaw is network-reachable with no attack complexity, requires no user interaction, and yields full C/I/A impact once privilege escalation succeeds. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | Full exploit scenario with step-by-step reproduction available after sign-in. |
| Remediation | Apply the Microsoft-released patches via Windows Update or the MSRC update guide at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-66818. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, create a complete inventory of all SQL Server instances running versions 2017, 2019, 2022, or 2025 across your infrastructure and identify which ones contain sensitive or regulated data; also note how many authenticated users have access to each instance. …
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Same weakness CWE-269 – Improper Privilege Management
View allSame technique Privilege Escalation
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External POC / Exploit Code
Leaving vuln.today