CVE-2026-20963
Published: April 11, 2026
Official Description
Microsoft SharePoint contains a deserialization of untrusted data vulnerability that allows an unauthorized attacker to execute code over a network.
Technical Analysis
CVE-2026-20963 requires local access, meaning attackers must already have a foothold on the target system.
Exploitation requires some privileges, which limits the exposure to scenarios where an attacker has already gained initial access.
CISA has added CVE-2026-20963 to the Known Exploited Vulnerabilities (KEV) catalog, confirming active exploitation in the wild. U.S. federal agencies are required to patch this within the mandated timeframe, and all organizations should treat remediation as urgent.
Affected Vendors & Products
Exploit & PoC Resources
News & Research Mentioning CVE-2026-20963
The SharePoint remote code execution vulnerability CVE-2026-20963, which Microsoft patched in January, has been exploited in the wild. The post CISA Warns of Attacks Exploiting Recent SharePoint Vulnerability appeared first on SecurityWeek. [xlite_meta score:50 src:SecurityWeek xlite_fp:4e5b9bcb67f12d0a90c2a4faafb7e2de0c96727ce3757c2cc2fa5437d4c86708]
CISA has added one new vulnerability to its Known Exploited Vulnerabilities (KEV) Catalog, based on evidence of active exploitation. CVE-2026-20963 Microsoft SharePoint Deserialization of Untrusted Data Vulnerability This type of vulnerability is a frequent attack vector for malicious cyber actors and poses significant risks to the federal enterprise. Binding Operational Directive (BOD) 22-01: Reducing the Significant Risk of Known Exploited Vulnerabilities established the KEV Catalog as a living list of known Common Vulnerabilities and Exposures (CVEs) that carry significant risk to the federal enterprise. BOD 22-01 requires Federal Civilian Executive Branch (FCEB) agencies to remediate identified vulnerabilities by the due date to protect FCEB netw [xlite_meta score:48 src:CISA Alerts xlite_fp:c575c7422d24519b63939cfee08698799300f0afef6fb579629b7022d6e9fede]
Quick Facts
Known Threat Actors
Recommended Actions
- →Apply vendor patches immediately
- →Monitor CVE-2026-20963 in threat intel feeds
- →Review IDS/IPS signatures for exploitation attempts
- !CISA KEV: Federal agencies must patch per BOD 22-01 timeline
- !Active exploitation confirmed — treat as P1