Medium severity · published Oct 8, 2026
CVE-2026-87681
An Access Control Bypass vulnerability exists in the Role-Based Access Control (RBAC) validation engine of Brocade Fabric OS versions before 10.0.1
6.3
CVSS
0.2%
EPSS
No
On KEV
Description
An Access Control Bypass vulnerability exists in the Role-Based Access Control (RBAC) validation engine of Brocade Fabric OS versions before 10.0.1. When processing certain management protocol operations, the RBAC engine incorrectly categorizes non-standard action opcodes during permission checks. This allows authenticated users with read-only management privileges to bypass access controls and execute restricted administrative operations.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L
Attack vector
Network
Complexity
Low
Privileges
Low
User interaction
None
Confidentiality
Low
Integrity
Low
Availability
Low
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.2% · higher than 9% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
FO
Fabric OS · Brocade
before 10.0.1 · source: vendor
FO
Fabric Operating System · Broadcom
before 10.0.1 · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-87681
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-87681
support.broadcom.com
https://support.broadcom.com/external/content/SecurityAdvisories/0/39075
More from Fabric OS
6.7
CVE-2025-1976
Code injection exposure in Fabric OS 9.1.0 through 9.1.1d6
9.8
CVE-2026-87659
A critical authorization bypass vulnerability exists in the Management Server handling of Brocade Fabric OS versions before 10.0.1
9.8
CVE-2026-87684
A stack-based buffer overflow vulnerability exists in the SNMP daemon request handling of Brocade Fabric versions before 10.0.1
8.8
CVE-2026-94585
An authentication bypass vulnerability exists in the web management interface of Brocade Fabric OS versions before 9.2.2d running on the MXG610 platform
8.8
CVE-2026-94578
Brocade Fabric OS versions before 10.0.1 contain an authorization logic vulnerability in the AAA (Authentication, Authorization, and Accounting) integration framework allows…