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CVE-2025-53771 is a Microsoft Office SharePoint vulnerability affecting on-premises SharePoint Server deployments. It is described as an improper limitation of a pathname to a restricted directory, resulting in a path traversal condition that allows spoofing over the network. The flaw is associated with improper authentication and serves as an updated fix or patch-bypass correction for the previously disclosed CVE-2025-49706. Public reporting indicates the issue was exploited as part of the ToolShell activity, where attackers abused weaknesses in SharePoint request handling and path validation to bypass prior protections. Multiple reports indicate the corrected logic tightened which request paths or referrers could bypass authentication checks, replacing insufficient validation with a stricter allowlist approach.
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No valid public exploits. Mallory filtered out 3 candidates as fakes, detection scripts, or README-only repos.
All candidate exploits were filtered out by Mallory's validation.
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Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.
180 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
Patch bypass vulnerability related to CVE-2025-49706; the content says full protection requires patching this issue as well.
One component CVE in the ToolShell SharePoint exploit chain that enabled unauthenticated remote code execution against self-hosted SharePoint servers.
A July 2025 Microsoft SharePoint deserialization vulnerability referenced as part of the product's recent exploitation history.
A Microsoft SharePoint Server vulnerability used in combination with CVE-2025-53770 in the ToolShell exploit chain and exploited in the wild.
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.