Unauthorized network access via API authentication bypass
Published Sep 29, 2026 · Updated Sep 29, 2026
Authentication bypass in the API endpoint of HPE Networking Instant On 3.4.1.0 and earlier allows remote attackers to access restricted networks. HPE has not publicly described how the endpoint mishandles authentication or identified the request that reaches the failing control. Exploitation requires unspecified preconditions outside the attacker's control, so version alone does not establish whether an installation is exposed.
Summary
What happened
Authentication bypass in the API endpoint of HPE Networking Instant On 3.4.1.0 and earlier allows remote attackers to access restricted networks. HPE has not publicly described how the endpoint mishandles authentication or identified the request that reaches the failing control. Exploitation requires unspecified preconditions outside the attacker's control, so version alone does not establish whether an installation is exposed.
The record
- CVE
- CVE-2026-76726
- Published
- Sep 29, 2026
- Updated
- Sep 29, 2026
- Vendor
- Hewlett Packard Enterprise (HPE)
- Product
- HPE Networking Instant On
- Classifications
- Unavailable
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Sep 29, 2026CVE publishedPublication date reported by the CVE source.
- Sep 29, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
Compare your product and version with the public record. A matching version still requires validation against your environment.
Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=0.0.0.0 <=3.4.1.0
What conditions does exploitation require?
What is affected?
Published CVSS scores
No CVSS assessment is available in this record.
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.
Weakness, pattern, technique
No sourced classifications are available.
Public exploit references
No public exploit references are available in this record.
Labels summarize the accepted research assessment. They do not indicate a test against your environment.
Technologies
Your stack
See the directory against your own environment.
Your stack
Check the software in your environment
Get started to see how Hinoki identifies affected software and validates exploitability in your environment.
Get started