CVE-2026-87426: An unauthenticated network-based attacker can query specific internal management endpoints on Brocade ASCG ver

Q: How do I fix CVE-2026-87426?

brocade active support connectivity gateway: upgrade to 3.5.0. Exact commands for each OS are on this page.

Q: Is CVE-2026-87426 being exploited?

CVE-2026-87426 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-2026-87426 affect?

CVE-2026-87426 affects brocade active support connectivity gateway. Severity is medium (CVSS 4.3). An unauthenticated network-based attacker can query specific internal management endpoints on Brocade ASCG versions before 3.5.0 to enumerate the configuration details and state of managed Brocade Fabric OS (FOS) switches. This results in t

Q: How urgent is CVE-2026-87426?

Priority 16/100. No elevated risk signals yet.

Routine

MEDIUM 4.3UPGRADE

CVE-2026-87426 is a medium-severity flaw (CVSS 4.3) affecting brocade active support connectivity gateway. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

An unauthenticated network-based attacker can query specific internal management endpoints on Brocade ASCG versions before 3.5.0 to enumerate the configuration details and state of managed Brocade Fabric OS (FOS) switches. This results in the unauthorized disclosure of the customer's SAN fabric management topology and switch connectivity attributes.

Why this priority

No elevated risk signals yet

A fixed release or distro patch exists.

Risk facts

CVSS score	4.3 (Medium)
Attack vector	Adjacent network
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.1% (top 96%)
CISA exploited list	No
Weakness	CWE-200
Published	2026-10-08
Last modified	2026-10-14

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

Last updated 2026-10-14 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-10-08 07:16 UTCPublished CVE record published
2026-10-14 18:50 UTCUpdated Record last modified

broadcom brocade active support connectivity gateway UPGRADE

Affected: < 3.5.0

Fixed in: 3.5.0

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy brocade-active-support-connectivity-gateway || rpm -q brocade-active-support-connectivity-gateway || brocade-active-support-connectivity-gateway --version

2. UPGRADE to 3.5.0 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade brocade-active-support-connectivity-gateway

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade brocade-active-support-connectivity-gateway

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

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-2026-87426?

brocade active support connectivity gateway: upgrade to 3.5.0. Exact commands for each OS are on this page.

Is CVE-2026-87426 being exploited?

CVE-2026-87426 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-2026-87426 affect?

CVE-2026-87426 affects brocade active support connectivity gateway. Severity is medium (CVSS 4.3). An unauthenticated network-based attacker can query specific internal management endpoints on Brocade ASCG versions before 3.5.0 to enumerate the configuration details and state of managed Brocade Fabric OS (FOS) switches. This results in t

How urgent is CVE-2026-87426?

Priority 16/100. No elevated risk signals yet.

Related CVEs

CVE-2023-5649 MEDIUM 5.5 UPGRADE An Improper Input Validation vulnerability for the registered case credentials in Brocade ASCG before v3.0 cou
CVE-2023-5648 MEDIUM 6.1 UPGRADE In Brocade ASCG before Brocade ASCG v3.0, several security-related HTTP Headers were missing in various Brocad
CVE-2026-87428 HIGH 7.8 UPGRADE In Brocade ASCG before 3.5.0, a local unauthorized user on the ASCG VM who can issue a request to the SANnav
CVE-2026-87425 MEDIUM 6.8 UPGRADE An unauthenticated remote attacker can modify the TLS client trust store in Brocade ASCG versions before 3.5.0
CVE-2026-87424 HIGH 8.8 UPGRADE A vulnerability in the SupportLink API authentication component of Brocade ASCG versions prior to 3.5.0 allows

References

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