Loading vulnerability…
CVE-2026-65801 is a critical server-side request forgery vulnerability in Microsoft Exchange Online. The flaw allows an unauthorized attacker to send crafted network requests that cause the Exchange Online service to perform unintended server-side requests, resulting in elevation of privilege. The vulnerability is remotely exploitable over the network, requires no prior authentication, and does not require user interaction. It affects the cloud-hosted Exchange Online service and does not apply to on-premises Microsoft Exchange Server deployments. Microsoft assigned the issue a CVSS v3.1 score of 10.0 with changed scope and high impact to confidentiality, integrity, and availability.
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.
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.
7 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
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.
A CVSS 10.0 elevation-of-privilege vulnerability in Exchange Online.
A critical elevation of privilege vulnerability in Exchange Online.
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.