Authentication & Authorization Bypass in Fibre Channel vendor-unique CT (Common Transport)
39153
06 October 2026
06 October 2026
CLOSED
HIGH
7.1 - CVSS:4.0/AV:L/AC:L/AT:P/PR:H/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
CVE-2026-87659
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Brocade Security Advisory ID |
BSA-2026-3961 |
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Component |
Fabric OS Management Server |
|
CWE |
CWE-306: Missing Authentication for Critical Function |
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Summary:
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 administrative passwords, initiating system reboots, and triggering firmware downloads.
Products Affected
- Brocade Fabric OS versions before 10.0.1
Products Not Affected
- Brocade SANnav is not affected by this vulnerability
[VEX Justification: Component_not_present] - Brocade ASCG is not affected by this vulnerability
[VEX Justification: Component_not_present]
Solution
- A security update is provided in Brocade Fabric OS 10.0.1
Note: This is a Frontier AI discovered vulnerability.
Revision History
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Version |
Change |
Date |
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1.0 |
Initial Publication |
October 6, 2026 |
Disclaimer
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