Affects Microsoft Exchange Online, a widely used enterprise cloud service; 10.0 CVSS SSRF leading to privilege escalation can disrupt orgs and admin control.
CVE-2026-65801
SSRF in Microsoft Exchange Online allows remote privilege escalation (CVSS 10.0).
Is CVE-2026-65801 being exploited?
Not confirmed. CVE-2026-65801 does not appear in CISA's Known Exploited Vulnerabilities catalog, which records only exploitation that has been observed and reported publicly. That is evidence of absence of a report, not evidence the flaw is unattacked. EPSS currently estimates a 0.51% probability of exploitation in the next 30 days.
How severe is CVE-2026-65801?
CVE-2026-65801 is rated Critical with a CVSS score of 10.0. Severity describes how bad exploitation would be, not how likely it is: pair it with exploitation evidence before deciding what to patch first.
Is there a patch for CVE-2026-65801?
Yes. A fix has been recorded for CVE-2026-65801. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2026-65801 affect?
CVE-2026-65801 affects Microsoft Exchange Online, Microsoft 365 Exchange services. Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-65801?
Apply vendor patch/mitigations immediately; block SSRF vectors and monitor Exchange logs.
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Remote SSRF enables attackers to access internal endpoints, escalate privileges in Exchange Online, and potentially access admin functions or sensitive data.
Immediate action required