Ech0 affected by unauthenticated SSRF in GetWebsiteTitle allows access to internal services and cloud metadata
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 tag extraction This vulnerability is fixed in 4.2.8.
- Products
- Not specified
- Affected versions
- Not specified
- Fixed versions
- Not specified
- CVEs
- CVE-2026-35037
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 4 Nov 2026, 11:45 UTC · Revision 1
Source evidence
Ech0 affected by unauthenticated SSRF in GetWebsiteTitle allows access to internal services and cloud metadata
core-osv · Original sourcePublished 6 Apr 2026, 16:56 UTC
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 tag extraction This vulnerability is fixed in 4.2.8.
osv:CVE-2026-35037
Complete source record
{
"id": "e68e9adb4a9f0ef0d4ee68004bb1f06b3235676c6e247472db3a8bdb00106bcc",
"url": "https://osv.dev/vulnerability/CVE-2026-35037",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "Ech0 affected by unauthenticated SSRF in GetWebsiteTitle allows access to internal services and cloud metadata",
"summary": "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 tag extraction This vulnerability is fixed in 4.2.8.",
"evidence": "osv:CVE-2026-35037",
"products": [],
"severity": "high",
"structured": {
"id": "CVE-2026-35037",
"aliases": [
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"GHSA-cqgf-f4x7-g6wc",
"GO-2026-5331"
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"metrics": [
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N"
}
],
"affected": [
{
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"type": "GIT",
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"source": "AFFECTED_FIELD",
"strategy": "StringRangeExpression"
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{
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"database_specific": {
"source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-35037.json"
}
}
],
"modified": "2026-10-28T02:30:34.429443746Z",
"provider": "osv",
"references": [
"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/35xxx/CVE-2026-35037.json",
"https://github.com/lin-snow/Ech0/security/advisories/GHSA-cqgf-f4x7-g6wc",
"https://nvd.nist.gov/vuln/detail/CVE-2026-35037"
],
"provider_metadata": {
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],
"cna_assigner": "GitHub_M",
"osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/35xxx/CVE-2026-35037.json"
}
},
"related_cves": [
{
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"evidence": "/id"
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],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 501979,
"published_at": "2026-04-06T16:56:54.674+00:00"
}