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Vulnerabilities

Vulnerability · CVE-2026-21262

Improper access control in SQL Server allows an authorized attacker to elevate privileges over a network.

Published Mar 10, 2026 · catalog updated Jul 10, 2026 · Microsoft

Patch now

CVE-2026-21262 is in the CISA known-exploited catalog. Confirm Microsoft against the vendor advisory and apply that fix. The CVSS score does not change the priority.

Gaps on this record

  • No version range is stored. A customer cannot check an installed version against this record.
Severity
High8.8
Known exploitation
CISA KEV and VulnCheck KEV
EPSS
2.08%
Remediation
Remediation guidance
Affected products
cpe microsoft/sql server 2016 · cpe microsoft/sql server 2017 · cpe microsoft/sql server 2019 · cpe microsoft/sql server 2022 · vendor Microsoft sql_server_2016

Improper access control in SQL Server allows an authorized attacker to elevate privileges over a network.

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • cpe microsoft/sql server 2016version unspecified
  • cpe microsoft/sql server 2017version unspecified
  • cpe microsoft/sql server 2019version unspecified
  • cpe microsoft/sql server 2022version unspecified
  • vendor Microsoft sql_server_2016version unspecified

How to fix CVE-2026-21262

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

CVE-2026-21262 is in the CISA known-exploited catalog. Confirm Microsoft against the vendor advisory and apply that fix. The CVSS score does not change the priority.

Which versions are affected?

Affected version ranges are not on this record. Apply remediations or mitigations per vendor instructions or discontinue use of the product if remediation or mitigations are unavailable.

What should an analyst verify?

CWE-284: Improper Access Control. EPSS 2.08%. The CISA KEV listing is the exploitation evidence. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Code

The project this record applies to. Exploit listings stay in References.

No public source repository is identified for this product.

Timeline

Detection, updates, and resolution for this record.

  1. Mar 10, 2026 · NIST NVD

    Detected

    Improper access control in SQL Server allows an authorized attacker to elevate privileges over a network.

  2. Apr 13, 2026 · CISA KEV

    Known exploited

    Apply remediations or mitigations per vendor instructions or discontinue use of the product if remediation or mitigations are unavailable.

  3. Jul 10, 2026 · NIST NVD

    Updated

    Improper access control in SQL Server allows an authorized attacker to elevate privileges over a network.

Sources

  • CVE.orgVulnerability recordCVE-2026-21262

    Official CVE identifier

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2026-21262

    30-day exploitation probability 2.1%

    first.org
  • NIST NVDVulnerability recordCVE-2026-21262

    Improper access control in SQL Server allows an authorized attacker to elevate privileges over a network.

    nvd.nist.gov
  • VulnCheck KEVConfirmed exploitationCVE-2026-21262

    Improper access control in SQL Server allows an authorized attacker to elevate privileges over a network.

    vulncheck.com

References

Freshness

Last verified in this catalog Oct 18, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.