Authenticated code execution via untrusted deserialization
Published Sep 8, 2026 · Updated Sep 10, 2026
Deserialization in Microsoft SQL Server 2019, 2022, and 2025 allows remote authenticated users to execute code over a network. SQL Server deserializes attacker-controlled data without adequate validation; Microsoft has not disclosed the affected component or serialization format. A valid low-privileged SQL Server account is required, and successful exploitation runs attacker-supplied code in the database service context.
Summary
What happened
Deserialization in Microsoft SQL Server 2019, 2022, and 2025 allows remote authenticated users to execute code over a network. SQL Server deserializes attacker-controlled data without adequate validation; Microsoft has not disclosed the affected component or serialization format. A valid low-privileged SQL Server account is required, and successful exploitation runs attacker-supplied code in the database service context.
The record
- CVE
- CVE-2026-77484
- Published
- Sep 8, 2026
- Updated
- Sep 10, 2026
- Vendor
- Microsoft
- Product
- Microsoft SQL Server 2022
- Classifications
- CWE-502, T1210
- Attack vector
- network
- Privileges
- authenticated
Timeline
How it unfolded
- Sep 8, 2026CVE publishedPublication date reported by the CVE source.
- Sep 10, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=16.0.0.0 <16.0.4275.2
- Affected versionversion=16.0.0 <16.0.1200.5
What conditions does exploitation require?
What is affected?
Published CVSS scores
CVSS describes severity. EPSS estimates exploitation probability.
Attacks
What attackers are doing with it
Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.
Weakness, pattern, technique
Public exploit references
No public exploit references are available in this record.
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Technologies
Your stack
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Your stack
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