CVE-2026-79671Public exploitNetwork attack vector

Admin-level SSRF via hostname resolution bypass

Published Aug 25, 2026 · Updated Aug 29, 2026

SSRF in Ech0 before 4.4.3 allows remote authenticated users with admin privileges to reach internal resources through crafted webhooks. validateWebhookURL passes hostname inputs when net.ParseIP returns nil, and the HTTP clients connect without validating the DNS-resolved address. An administrator can use a resolving hostname to probe private services or access cloud metadata, while delivery results expose connectivity.

CVSS severity5.1
Medium
EPSS probability0.24%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

SSRF in Ech0 before 4.4.3 allows remote authenticated users with admin privileges to reach internal resources through crafted webhooks. validateWebhookURL passes hostname inputs when net.ParseIP returns nil, and the HTTP clients connect without validating the DNS-resolved address. An administrator can use a resolving hostname to probe private services or access cloud metadata, while delivery results expose connectivity.

The record

CVE
CVE-2026-79671
Published
Aug 25, 2026
Updated
Aug 29, 2026
Vendor
lin-snow
Product
Ech0
Classifications
CWE-918, T1046, T1552.005
Attack vector
network
Privileges
admin

Timeline

How it unfolded

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

What conditions does exploitation require?

Attack vectornetwork
Required privilegesadmin

What is affected?

lin-snow · Ech0version=0 <4.4.3

Published CVSS scores

5.5VulnCheckCVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:L/I:L/A:N
5.1VulnCheckCVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:L/VI:L/VA:N/SC:L/SI:L/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
Privilegesadmin
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-918Server-Side Request Forgery (SSRF)
T1046Network Service Discovery
T1552.005Unsecured Credentials: Cloud Instance Metadata API

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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