CVE-2026-79667Public exploitNetwork attack vector

Admin data exposure via omitted token scope checks

Published Aug 25, 2026 · Updated Aug 25, 2026

Improper authorization in lin-snow Ech0 4.3.4 and earlier allows remote authenticated users to read privileged data via low-scope tokens. Several admin routes omit RequireScopes, while ExportBackup reparses a query token and rebuilds a viewer containing only its user ID, discarding scope metadata. An administrator account's deliberately limited token is required; successful requests expose inbox data and a ZIP containing logs and the full database.

CVSS severity7.6
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

Improper authorization in lin-snow Ech0 4.3.4 and earlier allows remote authenticated users to read privileged data via low-scope tokens. Several admin routes omit RequireScopes, while ExportBackup reparses a query token and rebuilds a viewer containing only its user ID, discarding scope metadata. An administrator account's deliberately limited token is required; successful requests expose inbox data and a ZIP containing logs and the full database.

The record

CVE
CVE-2026-79667
Published
Aug 25, 2026
Updated
Aug 25, 2026
Vendor
lin-snow
Product
Ech0
Classifications
CWE-285, T1078
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Aug 25, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 25, 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 <4.4.3

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

lin-snow · Ech0version=0 <4.4.3

Published CVSS scores

7.6lin-snowCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:L
7.2VulnCheckCVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:L/VA:L/SC:N/SI:N/SA: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
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-285Improper Authorization
T1078Valid Accounts

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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