Improper authentication spoofing vulnerability in Microsoft Office SharePoint
CVE-2025-49706 is an improper authentication / spoofing vulnerability affecting on-premises Microsoft Office SharePoint Server. Microsoft describes it as allowing an unauthorized attacker to perform spoofing over a network. Reporting in the provided content consistently ties the flaw to authentication bypass behavior on exposed SharePoint servers, including exploitation via crafted requests to SharePoint functionality such as the ToolPane endpoint as part of the broader "ToolShell" exploit chain. The vulnerability affects on-premises SharePoint deployments, not SharePoint Online in Microsoft 365, and has been observed chained with CVE-2025-49704 to achieve remote code execution and post-exploitation access.
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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
If you can’t patch tonight, do this now.
Remediation
Patch, then assume compromise.
Exploits
No valid public exploits. Mallory filtered out 2 candidates 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
155 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
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 vulnerability added to CISA KEV due to active exploitation (details not provided in excerpt).
A Microsoft vulnerability that CISA KEV’s knownRansomwareCampaignUse field silently flipped to Known during 2025 (evidence of ransomware campaign use).
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.