CISA Adds One Known Exploited Vulnerability to Catalog

CISA has added CVE-2026-20963, a Microsoft SharePoint deserialization vulnerability, to its Known Exploited Vulnerabilities catalog based on evidence of active exploitation. This vulnerability poses significant risks to federal enterprise networks and serves as a frequent attack vector for malicious actors. Under Binding Operational Directive 22-01, Federal Civilian Executive Branch agencies must remediate this vulnerability by the specified due date. While the directive applies specifically to federal agencies, CISA strongly urges all organizations to prioritize timely remediation of KEV catalog vulnerabilities as part of their vulnerability management practice. The deserialization flaw could allow attackers to execute arbitrary code by sending specially crafted requests to vulnerable SharePoint installations. Organizations should immediately patch affected systems to reduce exposure to potential cyberattacks.

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 networks against active threats. See the BOD 22-01 Fact Sheet for more information. Although BOD 22-01 only applies to FCEB agencies, CISA strongly urges all organizations to reduce their exposure to cyberattacks by prioritizing timely remediation of KEV Catalog vulnerabilities as part of their vulnerability management practice. CISA will continue to add vulnerabilities to the catalog that meet the specified criteria .

CISA has added CVE-2026-20963, a Microsoft SharePoint deserialization vulnerability, to its Known Exploited Vulnerabilities catalog based on evidence of active exploitation. This vulnerability poses significant risks to federal enterprise networks and serves as a frequent attack vector for malicious actors. Under Binding Operational Directive 22-01, Federal Civilian Executive Branch agencies must remediate this vulnerability by the specified due date. While the directive applies specifically to federal agencies, CISA strongly urges all organizations to prioritize timely remediation of KEV catalog vulnerabilities as part of their vulnerability management practice. The deserialization flaw could allow attackers to execute arbitrary code by sending specially crafted requests to vulnerable SharePoint installations. Organizations should immediately patch affected systems to reduce exposure to potential cyberattacks. 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 networks against active threats. See the BOD 22-01 Fact Sheet for more information. Although BOD 22-01 only applies to FCEB agencies, CISA strongly urges all organizations to reduce their exposure to cyberattacks by prioritizing timely remediation of KEV Catalog vulnerabilities as part of their vulnerability management practice. CISA will continue to add vulnerabilities to the catalog that meet the specified criteria . 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 networks against active threats. See the BOD 22-01 Fact Sheet for more information. Although BOD 22-01 only applies to FCEB agencies, CISA strongly urges all organizations to reduce their exposure to cyberattacks by prioritizing timely remediation of KEV Catalog vulnerabilities as part of their vulnerability management practice. CISA will continue to add vulnerabilities to the catalog that meet the specified criteria .