CVE-2026-49258Network attack vector

Cross-operator resource access via missing ownership checks

Published Jul 28, 2026 · Updated Jul 28, 2026

Missing authorization in juev nebula-mesh 0.3.5 and earlier allows remote authenticated users to access other operators' resources. The /ui/* handlers query hosts and networks without per-operator CA scoping, and block or delete handlers trust a URL-supplied host ID without ownership checks. Exposure requires a non-admin operator account; such access reveals host and network data and permits blocking or deleting another operator's hosts.

CVSS severity8.8
High
EPSS probability0.28%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Missing authorization in juev nebula-mesh 0.3.5 and earlier allows remote authenticated users to access other operators' resources. The /ui/* handlers query hosts and networks without per-operator CA scoping, and block or delete handlers trust a URL-supplied host ID without ownership checks. Exposure requires a non-admin operator account; such access reveals host and network data and permits blocking or deleting another operator's hosts.

The record

CVE
CVE-2026-49258
Published
Jul 28, 2026
Updated
Jul 28, 2026
Vendor
Forgekeep
Product
nebula-mesh
Classifications
CWE-639, CWE-862, T1190
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Jul 28, 2026CVE publishedPublication date reported by the CVE source.
  2. Jul 28, 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=< 0.3.6

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Forgekeep · nebula-meshversion=< 0.3.6

Published CVSS scores

8.8GitHubCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

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.

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

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-639Authorization Bypass Through User-Controlled Key
CWE-862Missing Authorization
T1190Exploit Public-Facing Application

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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