Affects Citrix Cloud, a widely used enterprise cloud service; enables attacker to take over accounts via password-reset OTP.
CVE-2025-66391
Read-only Citrix Cloud user can trigger password-reset; OTP sent to attacker email.
Is CVE-2025-66391 being exploited?
Not confirmed. CVE-2025-66391 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 0.38% probability of exploitation in the next 30 days.
How severe is CVE-2025-66391?
CVE-2025-66391 is rated High with a CVSS score of 8.8. 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-2025-66391?
Not known from our data. No patch reference has been recorded for CVE-2025-66391, which is not the same as no patch existing — a fix may have shipped without a tagged reference, or after this record was written. The vendor advisory is the only authority on whether a fix exists, and mitigations may be available regardless.
What does CVE-2025-66391 affect?
CVE-2025-66391 affects Citrix Cloud. Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2025-66391?
Patch when available; audit resets; enforce strict OTP routing.
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Account takeover via OTP delivery during password reset; attacker can compromise user accounts.
Patch when possible