Known vulnerability record
CVE-2025-53770
Microsoft SharePoint Deserialization of Untrusted Data Vulnerability
Summary
Microsoft SharePoint Deserialization of Untrusted Data Vulnerability
Microsoft SharePoint Server on-premises contains a deserialization of untrusted data vulnerability that could allow an unauthorized attacker to execute code over a network. This vulnerability could be chained with CVE-2025-53771. CVE-2025-53770 is a patch bypass for CVE-2025-49704, and the updates for CVE-2025-53770 include more robust protection than those for CVE-2025-49704.
Signals
Keep the signals separate
CVSS severitycriticalScore 9.8 · source microsoft
EPSS probability100.0%Probability of exploitation in the next 30 days; not severity
CISA KEVKnown exploitedAdded 2025-07-20
Ransomware useknownPreserved as known / unknown, not a truthy default
Timeline
Dates and provenance
- CVE published
- 2025-07-20
- CVE modified
- 2026-08-04
- KEV date added
- 2025-07-20
- Dataset fetched
- 2026-08-21T03:55:04.389Z
Sources
Original records
- https://www.cve.org/CVERecord?id=CVE-2025-53770 ↗
- https://nvd.nist.gov/vuln/detail/CVE-2025-53770 ↗
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2025-53770 ↗
Version history: normalized permanent page created 2026-08-20. Machine-enriched fields remain source-attributed.