CVE-2026-48058Public exploitNetwork attack vector

Operator impersonation via insecure session cookies

Published Jul 28, 2026 · Updated Jul 28, 2026

Sensitive cookie exposure in juev nebula-mesh before 0.3.2 allows man-in-the-middle attackers to steal operator sessions over HTTP. The session and OIDC handlers in internal/web/session.go and internal/web/oidc.go create cookies with HttpOnly and SameSite=Lax but omit Secure. Exposure requires observation of one plaintext request to the origin; a stolen session permits operator impersonation for its remaining 24-hour lifetime, while OIDC state exposure enables callback CSRF within 10 minutes.

CVSS severity7.5
High
EPSS probability0.19%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Sensitive cookie exposure in juev nebula-mesh before 0.3.2 allows man-in-the-middle attackers to steal operator sessions over HTTP. The session and OIDC handlers in internal/web/session.go and internal/web/oidc.go create cookies with HttpOnly and SameSite=Lax but omit Secure. Exposure requires observation of one plaintext request to the origin; a stolen session permits operator impersonation for its remaining 24-hour lifetime, while OIDC state exposure enables callback CSRF within 10 minutes.

The record

CVE
CVE-2026-48058
Published
Jul 28, 2026
Updated
Jul 28, 2026
Vendor
Forgekeep
Product
nebula-mesh
Classifications
CWE-614, T1539
Attack vector
network
Privileges
unauthenticated

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=< 0.3.2

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Forgekeep · nebula-meshversion=< 0.3.2

Published CVSS scores

4.6GitHub Advisory DatabaseCVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:U
7.5GitLab Advisory DatabaseCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A: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.

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
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-614Sensitive Cookie in HTTPS Session Without 'Secure' Attribute
T1539Steal Web Session Cookie

Public exploit references

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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