Unknown baddies are abusing yet another critical Microsoft SharePoint bug to compromise victims’ SharePoint servers, the US government warned.
CVE-2026-20963 is a critical deserialization flaw in SharePoint that allows unauthenticated attackers to remotely execute code on the server without any user interaction, and Redmond fixed the issue as part of its January Patch Tuesday. At the time, the vulnerability was neither publicly known nor exploited, according to Microsoft, which deemed exploitation “less likely.” Fast forward to Wednesday when the US Cybersecurity and Infrastructure Agency added CVE-2026-20963 to its Known Exploited Vulnerabilities (KEV) catalog, gave federal agencies just three days to issue a patch..
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Source: The Register News
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