Addressing Code Injection Risks in Microsoft SharePoint

Historical catalog analysis: CISA added this entry on July 22, 2025. The entry reflects catalog information retrieved on August 31, 2026, not a snapshot archived on the inclusion date. Check current vendor guidance before acting.

What the vulnerability is

CVE-2025-49704 is a code injection vulnerability affecting Microsoft SharePoint. This flaw allows an authorized attacker to execute code over a network. According to CISA, this vulnerability is known for use in ransomware campaigns and can be chained with CVE-2025-49706. Furthermore, a patch bypass identified as CVE-2025-53770 exists; updates addressing CVE-2025-53770 provide more robust protection than the initial updates for CVE-2025-49704.

Exposure and applicability

This vulnerability is particularly relevant to U.S. healthcare providers, health plans, and business associates who utilize on-premises SharePoint servers for document management, collaboration, and the storage of electronic Protected Health Information (ePHI). The risk is highest for organizations running public-facing SharePoint instances that are end-of-life (EOL) or end-of-service (EOS), specifically SharePoint Server 2013 and earlier versions.

Because ransomware often targets availability and integrity, the exploitation of this vulnerability could disrupt clinical workflows and patient care continuity if critical medical documentation or administrative records are encrypted or deleted.

Remediation priorities

Based on our analysis of the reported risks, healthcare security leaders should prioritize the following actions to reduce the likelihood of compromise:

1. Decommission Legacy Infrastructure: Disconnect any public-facing SharePoint Server versions that have reached EOL or EOS (including 2013 and earlier). These versions lack vendor support and are highly susceptible to known exploits.
2. Apply Robust Patching: For supported versions, prioritize the updates associated with CVE-2025-53770 rather than relying solely on the initial CVE-2025-49704 patch, as the former addresses a bypass and offers stronger protection.
3. Review Access Controls: Since the vulnerability requires an authorized attacker, auditing user permissions and implementing the principle of least privilege for SharePoint environments could limit the number of accounts capable of triggering the injection.

How to validate remediation

To verify that exposure has been reduced, organizations should perform the following checks:

• Inventory Audit: Confirm via system registries or server management consoles that no public-facing instances of SharePoint 2013 or earlier remain active.
• Version Verification: Cross-reference installed update IDs against vendor documentation to ensure the specific patch for CVE-2025-53770 is present, rather than only the baseline patch for CVE-2025-49704.
• Network Mapping: Verify through firewall logs or network diagrams that SharePoint servers are not unnecessarily exposed to the public internet.

Limits and open questions

While patching and decommissioning legacy systems reduce risk, these actions do not guarantee total prevention. Residual risk remains if an attacker gains authorized credentials via other means (such as phishing) to exploit the vulnerability from within the network. Additionally, because this flaw can be chained with CVE-2025-49706, organizations must ensure their remediation strategy addresses the entire chain of vulnerabilities rather than treating CVE-2025-49704 in isolation.

Source and editorial note

CVE-2025-49704: Microsoft SharePoint Code Injection Vulnerability · Source date: July 22, 2025 · Retrieved August 31, 2026.

Material facts are tied to the cited primary source. Recommendations are independent defensive analysis unless attributed to the source. Confirm consequential decisions against current authoritative guidance.

Archive date: July 25, 2025. The displayed post date is assigned three days after the source date to organize this retrospective archive; it does not mean this site published the analysis then. First published by this site: October 05, 2026 at 00:45 UTC.

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