Cross-Site Scripting Spoofing in Microsoft Office SharePoint
CVE-2026-26105 is a Microsoft Office SharePoint spoofing vulnerability caused by improper neutralization of input during web page generation, i.e., a cross-site scripting (XSS) flaw. The available content indicates that a remote, unauthorized attacker can exploit the issue over a network by causing malicious script to be rendered and executed in a victim user’s browser within the context of SharePoint. The vulnerability affects SharePoint’s web page generation path and can be used to present attacker-controlled content as if it were trusted SharePoint content, enabling browser-session script execution and spoofing of SharePoint pages or actions.
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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 public exploits tracked yet. Mallory keeps watching.
No public exploit code observed for this vulnerability.
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
2 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
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.