CVE-2025-49704 is a code injection vulnerability in Microsoft SharePoint. CISA added it to the Known Exploited Vulnerabilities catalogue on 22 July 2025, which means attackers have used it in real attacks. Microsoft SharePoint contains a code injection vulnerability that could allow an authorized attacker to execute code over a network. This vulnerability could be chained with CVE-2025-49706.
What the vulnerability means in SharePoint
A code injection flaw in Microsoft SharePoint matters because it can turn a trusted collaboration platform into an execution path. When an authorized attacker can run code over the network, the issue is no longer just a content or permissions problem, it becomes a server-side compromise path that can reach data, configuration, and downstream services.
In practice, the danger is amplified by SharePoint’s role as a shared enterprise system. A successful exploit can affect many users, site collections, and integrations at once, which makes the blast radius larger than a single malformed request or broken page.
Why code injection is dangerous in this product class
Code injection in a content platform is especially serious because the application often sits close to identity, document storage, and internal workflows. Once code runs in the SharePoint context, the attacker may inherit whatever access the platform has to files, metadata, connected systems, or backend services.
The most important security question is not simply whether the flaw exists, but what the attacker can do after execution. In a system like SharePoint, that can include data theft, tampering, persistence, and movement into adjacent infrastructure if the host is over-privileged or poorly segmented.
Because this CVE is in the CISA Known Exploited Vulnerabilities catalogue, organisations should treat it as an active exploitation concern and not a theoretical product bug. The authoritative sources for version-specific exposure and remediation are the vendor advisory and the NIST National Vulnerability Database entry, alongside the CISA KEV catalogue.
How organisations check exposure and limit blast radius
Exposure assessment starts with a complete inventory of SharePoint deployments, including internet-facing instances, test environments that are reachable from production networks, and any farm connected to sensitive content or privileged admin tooling. If a vulnerable instance is reachable from the network, the risk profile is materially worse than for an isolated internal lab system.
Teams should also review whether SharePoint is paired with elevated service accounts, broad file system rights, or integrations that would let injected code interact with other business systems. That kind of trust chaining is often what turns a vulnerability into a major incident.
For broader vulnerability prioritisation, the CVE Program gives the canonical identifier, while KEV status tells defenders that exploitation has been observed and remediation should be expedited. The practical response is to combine asset inventory, vendor guidance, and exposure analysis before deciding whether compensating controls are needed.
Remediation, detection, and post-patch review
Remediation should follow the vendor’s patch guidance as soon as possible, but patching alone is not the end of the response. For exploited SharePoint flaws, defenders should check for signs of post-exploitation activity such as unexpected child processes, unusual web activity, new or modified files, suspicious scheduled tasks, or changes to application configuration.
If patching is delayed, compensating controls should focus on reducing reachability and limiting execution opportunity. That usually means restricting network exposure, tightening administrative access, monitoring for anomalous requests, and preserving logs so investigators can reconstruct what happened.
After remediation, organisations should review whether attacker activity could have persisted through stolen tokens, altered binaries, or planted code. Where compromise is confirmed or strongly suspected, any credentials or service accounts used by the SharePoint host should be assessed for rotation because the real identity impact often extends beyond the patched vulnerability itself.
Risk and Threat Considerations
This CVE is dangerous because it can provide a direct code execution path on a platform that often has broad internal trust and access to sensitive information. If attackers can run code in the SharePoint context, they may use that foothold to steal data, modify content, or pivot into adjacent systems.
Failure mechanism: The attacker abuses the code injection weakness to execute commands or payloads in the SharePoint environment, then leverages the platform’s normal permissions and connectivity to expand access.
Impact: The result can include data compromise, service manipulation, persistence, and wider network exposure, especially when SharePoint is connected to privileged accounts or high-value content repositories.
Standards & Framework Alignment
This section maps relevant standards and security frameworks to the operational risks and controls described in this guidance.
NIST SP 800-53 Rev 5, CIS Controls v8 and OWASP ASVS set the governance and control requirements practitioners need to meet.
| Framework | Control / Reference | Relevance |
|---|---|---|
| NIST SP 800-53 Rev 5 | SI-2 — Flaw Remediation | Code injection requires timely remediation of known software flaws. |
| AU-6 — Audit Record Review, Analysis, and Reporting | Post-exploit review depends on logs that reveal execution and configuration changes. | |
| AC-6 — Least Privilege | Code injection is more dangerous when SharePoint runs with excessive rights. | |
| Recommendation — Prioritise SI-2 remediation for the vulnerable SharePoint instance and verify closure with post-fix testing. Review SharePoint and host audit logs for execution anomalies and suspicious administrative activity. Reduce SharePoint service and admin privileges to limit what injected code can access. | ||
| CIS Controls v8 | CIS-7 — Continuous Vulnerability Management | This KEV-listed vulnerability needs prioritised discovery and remediation. |
| CIS-8 — Audit Log Management | Detection and compromise review depend on retained and reviewable logs. | |
| Recommendation — Use continuous vulnerability management to inventory SharePoint exposure and accelerate remediation. Centralise and review SharePoint logs for exploitation indicators and post-patch persistence. | ||
| OWASP ASVS | V15 — Secure Coding and Architecture | Code injection is a core application security failure mode addressed by secure design and isolation. |
| V16 — Security Logging and Error Handling | Exploitation review needs logging that captures abnormal execution and failures. | |
| Recommendation — Apply secure architecture controls to reduce injection surfaces and constrain execution paths. Ensure application logging captures anomalous SharePoint execution and administrative changes. | ||
Practitioner Guidance
Why practitioners should care: Treat this as an exploitation-priority issue, not a routine maintenance item. If SharePoint is externally reachable or supports sensitive collaboration workflows, the security and business impact of delayed action rises quickly.
What to watch for: Look for unexpected code execution indicators, suspicious admin changes, and any evidence that the affected server may have been used to access other systems. A clean patch status does not prove the environment was not already compromised.
Practitioner takeaway: Use vendor remediation guidance for version details, use KEV status to drive urgency, and validate the environment for compromise after patching rather than assuming the vulnerability was the only problem.
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Reviewed and updated by the NHIMG editorial team on October 17, 2026.
NHI Mgmt Group — the #1 independent authority on Non-Human Identity, IAM, and Agentic AI security. nhimg.org