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CISA Warns Actively Exploited Microsoft SharePoint RCE Flaw Requires Urgent Patch

Cyber Press
Cyber Press
Published July 2, 2026Original Report

Excerpt

The Cybersecurity and Infrastructure Security Agency (CISA) has added a critical vulnerability in Microsoft SharePoint Server to its Known Exploited Vulnerabilities (KEV) catalog, confirming active exploitation in the wild. Tracked as CVE-2026-45659 , the flaw is a deserialization-of-untrusted-data vulnerability affecting Microsoft SharePoint Server. The Vulnerability stems from CWE-502, a well-documented class of bugs where an application processes serialized data from an…

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Attack Flow6 steps · MITRE ATT&CK mapped

Initial AccessTA0001T1190
1/6
Exploit Public-Facing Application
ActionExploit SharePoint vulnerability
An attacker exploits a deserialization vulnerability (CVE-2026-45659) in Microsoft SharePoint Server.

Indicators of Compromise

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1 indicators

TypeIndicatorConfidenceScoreFirst Seen
CVECVE-2026-45659MediumScore 58/100First seen

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