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ExploitedIn CISA KEVFix available

CVE-2025-53770

Microsoft SharePoint Server Remote Code Execution Vulnerability

Exploitation confirmed. First attested on 2025-07-20 by CISA-ADP, CISA KEV, GCVE · enisa-cnw-kev, GCVE · kevintel, GCVE · shadowserver.

  • Published2025-07-20
  • Fixed in16.0.18526.20508
  • WeaknessCWE-502

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

Description

Deserialization of untrusted data in on-premises Microsoft SharePoint Server allows an unauthorized attacker to execute code over a network. Microsoft is aware that an exploit for CVE-2025-53770 exists in the wild. Microsoft is preparing and fully testing a comprehensive update to address this vulnerability. In the meantime, please make sure that the mitigation provided in this CVE documentation is in place so that you are protected from exploitation.

Timeline

dates in UTC
  1. 2025-07-20Added to the CISA KEV catalogCISA KEV
  2. 2025-07-20Listed as exploited by GCVEGCVE
  3. 2025-07-20Exploitation first reportedCISA KEV
  4. 2025-07-2001:15CVE publishedNVD
  5. 2025-07-2303:55SSVC exploitation set to activeCISA-ADP
  6. 2025-08-11Exploit-DB entryExploit-DB

Versions per branch

NVD
Microsoft sharepoint server
BranchAffectedFixed in
16.0< 16.0.18526.2050816.0.18526.20508
2016.x= 2016no fix published
2019.x= 2019no fix published

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Products declared by the CNA3 products

As microsoft, the CNA that assigned this CVE, declared them in the CVE record; versions as written.

  • Microsoft SharePoint Enterprise Server 2016

    platforms: x64-based Systems

    Affected
    • ≥ 16.0.0, < 16.0.5513.1001fixed in 16.0.5513.1001custom
  • Microsoft SharePoint Server 2019

    platforms: x64-based Systems

    Affected
    • ≥ 16.0.0, < 16.0.10417.20037fixed in 16.0.10417.20037custom
  • Microsoft SharePoint Server Subscription Edition

    platforms: x64-based Systems

    Affected
    • ≥ 16.0.0, < 16.0.18526.20508fixed in 16.0.18526.20508custom

Source: the CNA record (CVE Program), © The MITRE Corporation,CVE Terms of UseCVE recordupdated 2026-02-13

Fix

  1. Update Microsoft sharepoint server to 16.0.18526.20508
  2. CISA’s required action: Disconnect public-facing versions of SharePoint Server that have reached their end-of-life (EOL) or end-of-service (EOS) to include SharePoint Server 2013 and earlier versions. For supported versions, please follow the mitigations according to CISA (URL listed below in Notes) and vendor instructions (URL listed below in Notes). Adhere to the applicable BOD 22-01 guidance for cloud services or discontinue use of the product if mitigations are not available.due 2025-07-21

Advisories and patches

Detection

read 2026-11-01 01:02 UTC
Nuclei template
available
ProjectDiscovery
Exploit-DB
EDB-52405
Exploit-DB
Proof of concept
Metasploit modules
1 moduleexploit/windows/http/sharepoint_toolpane_rcerank: excellentModule metadata: Metasploit Framework, © Rapid7, Inc., BSD-3-Clause.
Metasploit Framework

CISA Known Exploited Vulnerability

Date Added
2025-07-20
Patch Due Date
2025-07-21
Ransomware Use
Known
Required Action
Disconnect public-facing versions of SharePoint Server that have reached their end-of-life (EOL) or end-of-service (EOS) to include SharePoint Server 2013 and earlier versions. For supported versions, please follow the mitigations according to CISA (URL listed below in Notes) and vendor instructions (URL listed below in Notes). Adhere to the applicable BOD 22-01 guidance for cloud services or discontinue use of the product if mitigations are not available.

Sources

Identifiers

Technical details

CVSS v3 Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Published
2025-07-20
Last Modified
2026-08-04
NVD status
Analyzed
GitHub Advisory
GHSA-xcrc-8vqv-vc8r

Frequently asked questions

What is CVE-2025-53770?

Deserialization of untrusted data in on-premises Microsoft SharePoint Server allows an unauthorized attacker to execute code over a network. Microsoft is aware that an exploit for CVE-2025-53770 exists in the wild. Microsoft is preparing and fully testing a comprehensive update to address this vulnerability. In the meantime, please make sure that the mitigation provided in this CVE documentation is in place so that you are protected from exploitation.

Is CVE-2025-53770 actively exploited?

Yes. CVE-2025-53770 is on the CISA Known Exploited Vulnerabilities (KEV) catalog, meaning it has been confirmed as actively exploited in the wild. CISA requires federal agencies to patch by 2025-07-21.

What is the CVSS score for CVE-2025-53770?

CVE-2025-53770 has a CVSS v3 base score of 9.8 (CRITICAL severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

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