Microsoft SharePoint Server remote code execution (ToolShell component)
CVE-2025-49704 is a Microsoft Office SharePoint / SharePoint Server remote code execution vulnerability described by Microsoft as improper control of generation of code (code injection). Supporting reporting indicates the flaw was exploited as part of the ToolShell exploit chain together with CVE-2025-49706 against on-premises SharePoint Server deployments. Multiple sources in the provided content further characterize the vulnerable path as involving attacker-supplied data to the SharePoint ToolPane endpoint (/_layouts/15/ToolPane.aspx), where crafted WebPart/XML content in parameters such as MSOtlPn_DWP could reach unsafe processing paths. Kaspersky’s analysis states the exploit abused the ExcelDataSet control in Microsoft.PerformancePoint.Scorecards.Client.dll, with attacker-controlled CompressedDataTable data flowing through GetObjectFromCompressedBase64String and BinarySerialization.Deserialize, ultimately enabling arbitrary method execution via unsafe XML/deserialization behavior. Microsoft’s initial July 2025 fix was later found incomplete in some scenarios, and subsequent comprehensive fixes were issued under related CVEs in the ToolShell chain.
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Impact, mitigation & remediation
What it means. What to do now. Patch path, mitigations, and the assume-compromise checklist.
Impact
What an attacker gets, and what they’ve been doing with it.
Mitigation
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Remediation
Patch, then assume compromise.
Exploits
No valid public exploits. Mallory filtered out 1 candidate as fakes, detection scripts, or README-only repos.
All candidate exploits were filtered out by Mallory's validation.
Affected products & vendors
Products and vendors Mallory has correlated with this vulnerability. Open in Mallory to drill down to specific CPE configurations and version ranges.
Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.
Recent activity
152 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A publicly disclosed SharePoint vulnerability used by Storm-2603 for initial access into unpatched on-premises SharePoint servers.
A SharePoint vulnerability referenced as part of the 2025 ToolShell exploitation campaign in which chained SharePoint flaws were used to target customers.
A previously disclosed Microsoft SharePoint vulnerability (not further described in the content) referenced as related to later variant zero-days that were heavily exploited in 2025.
Microsoft SharePoint Server code injection/RCE vulnerability; added to CISA KEV due to active exploitation and referenced as related to CVE-2025-53770.
The version that knows your environment.
Query your assets running an affected version, and investigate the blast radius.
Every observed campaign linking this CVE to a named adversary.
Malware families riding this exploit, with evidence and IOCs.
YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.
Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.