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CVE-2025-49706 is an improper authentication vulnerability in on-premises Microsoft Office SharePoint that allows a remote, unauthorized attacker to perform spoofing over the network. Available technical reporting indicates the flaw is in SharePoint request authentication logic, specifically in handling of requests processed by the PostAuthenticateRequestHandler path, where specially crafted requests can satisfy authentication checks incorrectly. The issue has been described as a logic bug tied to validation of the HTTP Referrer header, allowing authentication bypass when the request is made under specific sign-out page referral conditions. In observed attack chains, this vulnerability has been used as the authentication-bypass or spoofing component of the ToolShell exploitation sequence, commonly paired with CVE-2025-49704 and later bypass-related variants CVE-2025-53770 and CVE-2025-53771. The vulnerability affects on-premises SharePoint deployments rather than SharePoint Online.
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No valid public exploits. Mallory filtered out 2 candidates as fakes, detection scripts, or README-only repos.
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172 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A SharePoint vulnerability referenced only as related content and not discussed in the main article.
A SharePoint Server vulnerability previously used in ToolShell attack chains to compromise servers.
SharePoint improper authentication/spoofing vulnerability that can provide the privileges needed to chain into authenticated remote code execution.
One component CVE in the ToolShell SharePoint exploit chain that enabled unauthenticated remote code execution against self-hosted SharePoint servers.
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.
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Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.