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CVE-2026-65801 is a critical server-side request forgery vulnerability in the cloud-hosted Microsoft Exchange Online service. An unauthorized attacker can exploit the flaw remotely over a network to elevate privileges. The vulnerability is rated CVSS v3.1 10.0 with network attack vector, low attack complexity, no required privileges, no user interaction, changed scope, and high confidentiality, integrity, and availability impact. On-premises Microsoft Exchange Server deployments are not affected.
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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.
No public exploits tracked yet. Mallory keeps watching.
No public exploit code observed for this vulnerability.
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.
10 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
Privilege escalation vulnerability in Exchange Online allowing unauthenticated remote elevation of privileges.
A critical elevation of privilege vulnerability in Microsoft Exchange Online.
A maximum severity Exchange Online vulnerability allowing unauthenticated attackers to escalate privileges remotely.
A critical SSRF vulnerability in Microsoft Exchange Online that allows unauthorized privilege escalation over a network.
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.