Threat Intelligence Brief
Curated summary with source attribution
Source: thehackernews.com
Threat Risk: High
Victim: Organizations using Microsoft SharePoint and AD FS
Incident: Active exploitation of privilege escalation vulnerabilities in Microsoft SharePoint and AD FS.
Impact: Potential for unauthorized privilege escalation and compromise of critical identity and document management systems.
Attacker: Unidentified threat actors
Analysis: Attackers are currently leveraging privilege escalation flaws in core identity and collaboration infrastructure. CVE-2026-56164 allows unauthenticated remote attackers to escalate privileges in SharePoint, while CVE-2026-56155 targets Active Directory Federation Services. The sheer volume of this update makes exploitation-based triage more critical than relying solely on CVSS scores.
Recommendations: Prioritize patching CVE-2026-56164 and CVE-2026-56155 immediately.; Enable AMSI in Full Mode on SharePoint servers to blunt potential attacks.; Migrate from SharePoint Server 2016 and 2019 as they have reached end of support.
Source: The Hacker News
Editorial note: this post summarizes third-party reporting and links to the original source.
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