CVE-2026-87659: A critical authorization bypass vulnerability exists in the Management Server handling of Brocade Fabric OS ve

Q: How do I fix CVE-2026-87659?

fabric operating system: upgrade to 10.0.1. Exact commands for each OS are on this page.

Q: Is CVE-2026-87659 being exploited?

CVE-2026-87659 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2026-87659 affect?

CVE-2026-87659 affects fabric operating system. Severity is critical (CVSS 9.8). A critical authorization bypass vulnerability exists in the Management Server handling of Brocade Fabric OS versions before 10.0.1. A compromised switch connected to the fabric can transmit crafted inband Fibre Channel vendor-unique CT (Com

Q: How urgent is CVE-2026-87659?

Priority 43/100. Critical severity; Remotely exploitable, no login, no user action

This month

CRITICAL 9.8REMOTEUPGRADE

CVE-2026-87659 is a critical-severity flaw (CVSS 9.8) affecting fabric operating system. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

A critical authorization bypass vulnerability exists in the Management Server handling of Brocade Fabric OS versions before 10.0.1. A compromised switch connected to the fabric can transmit crafted inband Fibre Channel vendor-unique CT (Common Transport) management requests to bypass administrative authentication. Successful exploitation allows an unauthorized peer switch to execute administrative actions on the target device, including resetting

Why this priority

Critical severity
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	9.8 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.2% (top 85%)
CISA exploited list	No
Weakness	CWE-306
Published	2026-10-08
Last modified	2026-10-13

Publisher (CNA): Brocade Communications Systems, LLC · Vendor: broadcom

Last updated 2026-10-13 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-10-08 03:16 UTCPublished CVE record published
2026-10-13 17:25 UTCUpdated Record last modified

broadcom fabric operating system UPGRADE

Affected: < 10.0.1

Fixed in: 10.0.1

Safe to downgrade to: no unaffected older release

Check your OS release

cat /etc/os-release; uname -r

Debian / Ubuntu

sudo apt update && sudo apt full-upgrade

RHEL / Amazon Linux / Fedora

sudo dnf upgrade --refresh

Windows

Install the latest cumulative update from Windows Update

If no patch exists yet

OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-87659?

fabric operating system: upgrade to 10.0.1. Exact commands for each OS are on this page.

Is CVE-2026-87659 being exploited?

CVE-2026-87659 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-87659 affect?

CVE-2026-87659 affects fabric operating system. Severity is critical (CVSS 9.8). A critical authorization bypass vulnerability exists in the Management Server handling of Brocade Fabric OS versions before 10.0.1. A compromised switch connected to the fabric can transmit crafted inband Fibre Channel vendor-unique CT (Com

How urgent is CVE-2026-87659?

Priority 43/100. Critical severity; Remotely exploitable, no login, no user action

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References

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