CVE-2026-35037Public exploitNetwork attack vector

Unauthenticated internal service access via unvalidated URL

Published Apr 6, 2026 · Updated Apr 6, 2026

SSRF in Ech0 before 4.2.8 allows remote attackers to reach internal services through the public website-title endpoint. The GetWebsiteTitle handler passes the unvalidated website_url value to an HTTP client that follows redirects and permits any target host or IP address. No authentication is required; reachable HTML title content is returned, enabling limited data disclosure and internal service discovery.

CVSS severity7.2
High
EPSS probability0.62%
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 4.2.8 allows remote attackers to reach internal services through the public website-title endpoint. The GetWebsiteTitle handler passes the unvalidated website_url value to an HTTP client that follows redirects and permits any target host or IP address. No authentication is required; reachable HTML title content is returned, enabling limited data disclosure and internal service discovery.

The record

CVE
CVE-2026-35037
Published
Apr 6, 2026
Updated
Apr 6, 2026
Vendor
lin-snow
Product
Ech0
Classifications
CWE-918, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Apr 6, 2026CVE publishedPublication date reported by the CVE source.
  2. Apr 6, 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=< 4.2.8

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

lin-snow · Ech0version=< 4.2.8

Published CVSS scores

7.2GitHub, Inc.CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/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.

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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-918Server-Side Request Forgery (SSRF)
T1190Exploit Public-Facing Application

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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