CVE-2026-87687

Cross-fabric access via unchecked fabric identifier

Published Oct 8, 2026 · Updated Oct 8, 2026

Authorization bypass in Brocade Fabric OS before 9.2.2d and 10.0.0 through 10.0.0a1 lets remote authenticated users access other Virtual Fabrics. The Fabric OS CLI accepts a crafted request containing an arbitrary fabric identifier without enforcing the user's Virtual Fabric authorization boundary. A restricted account in one Virtual Fabric is required; it can perform unauthorized cross-fabric operations and read other tenants' configuration details.

CVSS severity8.5
High
EPSS probability0.21%
Next 30 days · Oct 19, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Authorization bypass in Brocade Fabric OS before 9.2.2d and 10.0.0 through 10.0.0a1 lets remote authenticated users access other Virtual Fabrics. The Fabric OS CLI accepts a crafted request containing an arbitrary fabric identifier without enforcing the user's Virtual Fabric authorization boundary. A restricted account in one Virtual Fabric is required; it can perform unauthorized cross-fabric operations and read other tenants' configuration details.

The record

CVE
CVE-2026-87687
Published
Oct 8, 2026
Updated
Oct 8, 2026
Vendor
Brocade Communications Systems
Product
Fabric OS
Classifications
CWE-88
Attack vector
adjacent
Privileges
authenticated

Timeline

How it unfolded

  1. Oct 8, 2026CVE publishedPublication date reported by the CVE source.
  2. Oct 8, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0 <9.2.2d
  2. Affected versionversion=10.0.0 <=10.0.0a1

What conditions does exploitation require?

Attack vectoradjacent
Required privilegesauthenticated

What is affected?

Brocade Communications Systems · Fabric OSversion=0 <9.2.2d; version=10.0.0 <=10.0.0a1

Published CVSS scores

8.5Brocade Communications SystemsCVSS:4.0/AV:A/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Activity data is delayed. The latest report is Sep 28, 2026.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 22, 2026Sep 28, 2026
Latest reporting daySep 28, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectoradjacent
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-88Improper Neutralization of Argument Delimiters or Special Sequences in Commands

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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