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VulnerabilityPublished

CVE-2026-35037: lin-snow Ech0 · Server-Side Request Forgery (SSRF)

Affects lin-snow Ech0Source CVE Database V5

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Not known to be exploited · public detection template (Nuclei) · CVSS 7.2 High : upgrade to 4.2.8 soon.

Data as of 30 Oct 2026, 11:52 UTC

CVSS 3.1 base score
7.2High
How severe the flaw is on the 0–10 CVSS scale.
EPSS
0.6% chance of exploitation in 30 days – higher than 49% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
Patch
Available – fixed in 4.2.8
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 6 Apr 2026

  2. Weaponized: evidence found.

    Public exploit code: GitHub proofs of concept

  3. Exploited in the wild: no evidence on record.

    Not in CISA KEV and no source reports exploitation

  4. Observed by OffSeq Mirage: no evidence on record.

    No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), GitHub proofs of concept, the Metasploit, Exploit-DB and nuclei-templates index as of 30 Oct 2026.

What to do

Upgrade Ech0 and lin-snow/Ech0 to 4.2.8.

Affected software

ProductAffectedFixed in
lin-snowEch0Affected
  • <4.2.8
Fixed in
  • 4.2.8
GitHublin-snow/Ech0pkg:github/lin-snow/Ech0Other threatsAffected
  • <4.2.8
Fixed in
  • 4.2.8

Check your own hosts for these packages with threat-finder (opens in a new tab), our free open-source scanner.

AI-suggested

Upgrade Ech0 to version 4.2.8 or later, where this SSRF vulnerability is fixed. Since the vulnerability is resolved in the updated version, no additional mitigation steps are required beyond applying the official patch. Patch status is confirmed by the vendor advisory stating the fix is included in version 4.2.8.

Description

Ech0 is an open-source, self-hosted publishing platform for personal idea sharing. Prior to 4.2.8, the GET /api/website/title endpoint accepts an arbitrary URL via the website_url query parameter and makes a server-side HTTP request to it without any validation of the target host or IP address. The endpoint requires no authentication. An attacker can use this to reach internal network services, cloud metadata endpoints (169.254.169.254), and localhost-bound services, with partial response data exfiltrated via the HTML <title> tag extraction This vulnerability is fixed in 4.2.8.

References

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