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Vulnerability record · CVE-2026-20803 · published 13 January 2026

CVE-2026-20803: Microsoft sql server 2022 missing authentication for critical function vulnerability

Microsoft · Sql Server 2022

Missing authentication for critical function in SQL Server allows an authorized attacker to elevate privileges over a network.

7.2 CVSS 3.1 High EPSS 1.3% · top 31.4% CWE-306 · Missing authentication for critical function
7.2CVSS 3.1 base score
1.3%EPSS exploitation probability, 30 days
NoNot in CISA KEV
2Affected product versions listed by NVD
1References
30 Jul 2026Last modified by NVD

Description

Missing authentication for critical function in SQL Server allows an authorized attacker to elevate privileges over a network.

CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H

Affected products

2 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-20803 Vendor Advisory

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

9.8CVE-2026-67643Microsoft sql server 2022 heap-based buffer overflow vulnerabilityHeap-based buffer overflow in SQL Server allows an unauthorized attacker to execute code over a network.EPSS 0.97%9.8CVE-2026-67631Microsoft sql server 2017 heap-based buffer overflow vulnerabilityHeap-based buffer overflow in SQL Server allows an unauthorized attacker to execute code over a network.EPSS 0.97%9.8CVE-2026-54117Microsoft sql server 2016 deserialization of untrusted data vulnerabilityDeserialization of untrusted data in SQL Server allows an unauthorized attacker to execute code over a network.EPSS 1.5%9.8CVE-2026-54118Microsoft sql server 2016 deserialization of untrusted data vulnerabilityDeserialization of untrusted data in SQL Server allows an unauthorized attacker to execute code over a network.EPSS 1.5%9.8CVE-2024-37980Microsoft sql server 2016 improper privilege management vulnerabilityMicrosoft SQL Server Elevation of Privilege VulnerabilityEPSS 1.4%9.8CVE-2024-37341Microsoft sql 2016 azure connect feature pack improper access control vulnerabilityMicrosoft SQL Server Elevation of Privilege VulnerabilityEPSS 1.4%9.0CVE-2026-67636Microsoft sql server 2019 out-of-bounds read vulnerabilityOut-of-bounds read in SQL Server allows an unauthorized attacker to execute code over a network.EPSS 0.71%9.0CVE-2026-67378Microsoft sql server 2019 vulnerabilityUntrusted pointer dereference in SQL Server allows an unauthorized attacker to execute code over a network.EPSS 0.71%

Source: NIST National Vulnerability Database (record CVE-2026-20803), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.