Loading vulnerability…
CVE-2025-53771 is a network-exploitable spoofing vulnerability in on-premises Microsoft SharePoint Server associated with improper path validation and path traversal. It affects SharePoint Server 2016, SharePoint Server 2019, and SharePoint Server Subscription Edition; SharePoint Online in Microsoft 365 is not affected. The vulnerability is a patch-bypass variant associated with the ToolShell exploit chain and has been actively exploited alongside CVE-2025-53770. Combined exploitation enables unauthenticated compromise and remote code execution. Its standalone characterization is inconsistent: some descriptions identify improper authentication permitting unauthorized spoofing, while others identify path traversal permitting an authorized attacker to spoof.
Mallory correlates every CVE against your assets, your vendors, and active adversary campaigns. Know which vulnerabilities matter for you, not just which ones are loud.
What it means. What to do now. Patch path, mitigations, and the assume-compromise checklist.
What an attacker gets, and what they’ve been doing with it.
If you can’t patch tonight, do this now.
Patch, then assume compromise.
1 valid exploit after Mallory filtered fakes, detection scripts, and README-only repos (3 hidden).
This repository contains a single Metasploit module, 'sharepoint_toolpane_rce.rb', which exploits unauthenticated remote code execution vulnerabilities in Microsoft SharePoint Server (CVE-2025-49704, CVE-2025-49706, and CVE-2025-53771). The exploit leverages a combination of authentication bypass and unsafe deserialization to execute arbitrary commands as the SharePoint site user. The module constructs a malicious serialized .NET DataSet object, compresses it, and embeds it in a crafted XML payload sent via a POST request to the '/_layouts/15/ToolPane.aspx' endpoint. The exploit is unauthenticated and weaponized, allowing for custom command execution. The code is written in Ruby and is structured as a standard Metasploit exploit module, making it easy to use within the Metasploit framework. The repository is highly focused, containing only the exploit module file, and targets vulnerable, unpatched SharePoint Server instances on Windows.
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.
200 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A vulnerability in on-premises Microsoft SharePoint Server involved in subsequent ToolShell-related exploitation associated with Warlock ransomware. Its individual technical mechanism and its use in the documented July 2026 intrusion are not specified.
A patch-bypass variant within the ToolShell vulnerability set affecting on-premises Microsoft SharePoint Server. The article associates this vulnerability set with initial access for Warlock ransomware and states that all four CVEs are in CISA’s KEV catalog. SharePoint Online is not affected.
A vulnerability in on-premises Microsoft SharePoint Server identified as part of the ToolShell exploit chain used by Longlegs for initial access in Warlock ransomware attacks. The content describes webshell installation, ASP.NET machine-key theft, and forged signed payloads enabling arbitrary code execution, but does not distinguish this CVE's individual contribution to the chain.
A subsequent bypass vulnerability associated with the Microsoft SharePoint ToolShell exploit chain.
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.