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Vulnerabilities

Vulnerability · CVE-2026-33112

Deserialization of untrusted data in Microsoft Office SharePoint allows an authorized attacker to execute code over a network.

Published May 12, 2026 · catalog updated Jun 17, 2026 · sharepoint server

Check if you run it

No confirmed exploitation is on record for CVE-2026-33112. EPSS is 2.29%. Act only if a listed version of sharepoint server is installed.

Gaps on this record

  • No version range is stored. A customer cannot check an installed version against this record.
  • No vendor fix or required action is stored. Compare the linked advisory before you change production.
Severity
High8.8
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
2.29%
Remediation
Advisory link
Affected products
cpe microsoft/sharepoint server

Deserialization of untrusted data in Microsoft Office SharePoint allows an authorized attacker to execute code 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/sharepoint server2016
  • cpe microsoft/sharepoint server2019

How to fix CVE-2026-33112

What to do

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

Should you patch?

No confirmed exploitation is on record for CVE-2026-33112. EPSS is 2.29%. Act only if a listed version of sharepoint server is installed.

Which versions are affected?

Compare what you have installed with microsoft/sharepoint server 2016; microsoft/sharepoint server 2019. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

CWE-502: Deserialization of Untrusted Data. EPSS 2.29%. There is no CISA KEV listing. 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. May 12, 2026 · NIST NVD

    Detected

    Deserialization of untrusted data in Microsoft Office SharePoint allows an authorized attacker to execute code over a network.

  2. Jun 17, 2026 · NIST NVD

    Updated

    Deserialization of untrusted data in Microsoft Office SharePoint allows an authorized attacker to execute code over a network.

Sources

  • CVE.orgVulnerability recordCVE-2026-33112

    Official CVE identifier

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2026-33112

    30-day exploitation probability 2.3%

    first.org
  • NIST NVDVulnerability recordCVE-2026-33112

    Deserialization of untrusted data in Microsoft Office SharePoint allows an authorized attacker to execute code over a network.

    nvd.nist.gov

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.