Microsoft SharePoint Server Deserialization of Untrusted Data Vulnerability
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-45659 ; BOD 26-04: https://www.cisa.gov/news-events/directives/bod-26-04-prioritizing-security-updates-based-risk ; Forensics Triage Requirements: https://www.cisa.gov/news-events/directives/bod-26-04-implementation-guidance-prioritizing-security-updates-based-risk ; https://nvd.nist.gov/vuln/detail/CVE-2026-45659
Affected packages
No package-level mapping for this advisory.
Exploit signal
- Known exploited (CISA KEV)
- Yes
- EPSS score
- 9.12%
- EPSS percentile
- 94.8%
EPSS is the probability a CVE is exploited in the wild; percentile is its rank among all CVEs. This advisory is in the top 95%.
Sources
No external sources available.
Recommended response stack
Snyk — Scan your dependencies in CI and fix this vulnerability.→Socket — Detect malicious and compromised packages before they ship.→
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