CVE-2026-76731Network attack vector

Unauthenticated captive portal access

Published Sep 29, 2026 · Updated Sep 29, 2026

Authentication bypass in HPE Networking Instant On 3.4.1.0 and earlier allows remote attackers limited captive portal access. HPE has not publicly identified the captive portal request or authentication decision responsible for the bypass, so its mechanism remains undisclosed. Exposure requires a reachable captive portal on an affected deployment; the reported consequences are limited data access and limited changes within that component.

CVSS severityUnavailable
Unscored
EPSS probability0.32%
Next 30 days · Oct 19, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Authentication bypass in HPE Networking Instant On 3.4.1.0 and earlier allows remote attackers limited captive portal access. HPE has not publicly identified the captive portal request or authentication decision responsible for the bypass, so its mechanism remains undisclosed. Exposure requires a reachable captive portal on an affected deployment; the reported consequences are limited data access and limited changes within that component.

The record

CVE
CVE-2026-76731
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

  1. Sep 29, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 29, 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=0.0.0.0 <=3.4.1.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Hewlett Packard Enterprise (HPE) · HPE Networking Instant Onversion=0.0.0.0 <=3.4.1.0

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.

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)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

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

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Your stack

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