# CVE-2025-53770: A Microsoft SharePoint bug is being used in attacks

Status: Being used now (CISA KEV, added 2025-07-20)
Who: 
Do this: 

## Agent prompt (read-only)
Read-only check, change nothing, send nothing anywhere.
Is Microsoft SharePoint (CVE-2025-53770) installed or running on this machine or in this project?
1. Find every copy and its version (apps, packages, containers, lockfiles).
2. Compare each version against the vendor's fixed version for CVE-2025-53770. Quote the vendor page you used.
3. Report a table: where, version, fixed version, status (exposed / fixed / not installed / unsure).
4. List the exact update steps, but do not run them.

## Official description
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.

## Sources
- https://www.microsoft.com/en-us/security/blog/2025/07/22/disrupting-active-exploitation-of-on-premises-sharepoint-vulnerabilities/
- https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-53770
- https://nvd.nist.gov/vuln/detail/CVE-2025-53770
- https://nvd.nist.gov/vuln/detail/CVE-2025-53770

Generated by isitexploited.org from public sources. Verify version numbers against the vendor before acting.