Authenticated code execution via unsafe deserialization
Published Mar 10, 2026 · Updated Mar 10, 2026
Deserialization of untrusted data in affected Microsoft SharePoint Server 2016 and 2019 builds allows remote authenticated users to execute code. Microsoft has not disclosed the affected SharePoint component, serialized-data format, or deserialization operation that accepts attacker-controlled data. A low-privileged authenticated account can reach the flaw over the network and execute code with the vulnerable service's privileges.
Summary
What happened
Deserialization of untrusted data in affected Microsoft SharePoint Server 2016 and 2019 builds allows remote authenticated users to execute code. Microsoft has not disclosed the affected SharePoint component, serialized-data format, or deserialization operation that accepts attacker-controlled data. A low-privileged authenticated account can reach the flaw over the network and execute code with the vulnerable service's privileges.
The record
- CVE
- CVE-2026-26114
- Published
- Mar 10, 2026
- Updated
- Mar 10, 2026
- Vendor
- Microsoft
- Product
- Microsoft SharePoint Enterprise Server 2016
- Classifications
- CWE-502, T1190
- Attack vector
- network
- Privileges
- authenticated
Timeline
How it unfolded
- Mar 10, 2026CVE publishedPublication date reported by the CVE source.
- Mar 10, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
Compare your product and version with the public record. A matching version still requires validation against your environment.
Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=16.0.0 <16.0.5543.1000
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.
Labels summarize the accepted research assessment. They do not indicate a test against your environment.
Technologies
Your stack
See the directory against your own environment.
Your stack
Check the software in your environment
Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.
Book a demo