Summary
generated automatically from NVD dataCVE-2026-50522 affects Microsoft Office SharePoint Server (versions 2016 and 2019, with an NVD bound of 16.0.19725.20434). It is a deserialization of untrusted data flaw (CWE-502) that lets an unauthorized attacker execute code over a network. It carries a CVSS v3.1 score of 9.8 (CRITICAL), with a network attack vector, low complexity, and no privileges or user interaction required. The flaw is listed in the CISA KEV catalog, added on 2026-07-22, which indicates active exploitation.
NVD description
Deserialization of untrusted data in Microsoft Office SharePoint allows an unauthorized attacker to execute code over a network.
⚠️ Actively exploited — CISA KEV
This CVE was added to CISA's Known Exploited Vulnerabilities catalog on 2026-07-22. It is confirmed exploited in the wild and must be patched as a priority.
Remediation deadline (US federal agencies): 2026-07-25
EPSS · FIRST.org
3.0%probability of exploitation in the next 30 days
Higher than 87% of scored CVEs
EPSS (Exploit Prediction Scoring System) estimates, from observed exploitation activity, how likely a CVE is to be exploited in the next 30 days. It complements CVSS, which measures severity, not likelihood. Score of 2026-10-16, recomputed daily by FIRST.org.
In-depth analysis on cveo.tech
We've published a detailed analysis of this CVE — exploitation, IOCs and mitigation.
CVSS v3.1 Score
Information
- Published
- 14 juil. 2026
- Updated
- 23 juil. 2026
- Status
- Analyzed
- Source
- secure@microsoft.com
Affected products
Weaknesses (CWE)
References (2)
- https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-50522PatchVendor Advisory
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-50522US Government Resource
Similar CVEs
Other vulnerabilities of type CWE-502
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