Targets Broadcom/Brocade Fabric OS used in enterprise SAN infrastructure; authenticated command injection can compromise storage management and disrupt operations.
CVE-2026-87666
Authenticated command-injection in Brocade Fabric OS timezone API allows elevated shell access.
Is CVE-2026-87666 being exploited?
Not confirmed. CVE-2026-87666 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 1.8% probability of exploitation in the next 30 days.
How severe is CVE-2026-87666?
CVE-2026-87666 is rated High with a CVSS score of 8.6. 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-2026-87666?
Yes. A fix has been recorded for CVE-2026-87666. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2026-87666 affect?
CVE-2026-87666 affects Brocade Fabric OS < 9.2.2d, Brocade Fabric OS 10.0.0 - 10.0.0a1, Broadcom/Brocade SAN switches running Fabric OS. Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-87666?
Apply vendor updates (upgrade to fixed versions), restrict REST/config access, rotate creds and audit logs.
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Authenticated low-privilege admin can inject shell metacharacters via timezone REST/config to execute arbitrary shell commands with elevated privileges.
Immediate action required
- affected< 9.2.2d
- affected>= 10.0.0 and <= 10.0.0a1
As published in the CVE Program record. A version outside these ranges is not a statement that it is unaffected — vendors sometimes understate a range, and distribution-backported builds carry upstream numbers that do not reflect what was patched into them.