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Critical

stoatchat before 0.13.5 Unauthenticated SSRF via proxy and embed endpoints

Type: advisorySources: OSV

stoatchat before 0.13.5 contains an unauthenticated server-side request forgery vulnerability in the /proxy and /embed endpoints that accept arbitrary URLs without DNS resolution filtering or private IP range validation. Attackers can enumerate internal services, fingerprint applications, and reach instance metadata endpoints by supplying malicious URLs or leveraging redirect chains to access internal infrastructure.

Products
Not specified
Affected versions
Not specified
Fixed versions
Not specified
CVEs
CVE-2026-63306
Confirmed fixed CVEs
Not specified
Updated in this feed
3 Nov 2026, 18:03 UTC · Revision 1

Source evidence

stoatchat before 0.13.5 Unauthenticated SSRF via proxy and embed endpoints

core-osv · Original source

Published 16 Jul 2026, 12:19 UTC

stoatchat before 0.13.5 contains an unauthenticated server-side request forgery vulnerability in the /proxy and /embed endpoints that accept arbitrary URLs without DNS resolution filtering or private IP range validation. Attackers can enumerate internal services, fingerprint applications, and reach instance metadata endpoints by supplying malicious URLs or leveraging redirect chains to access internal infrastructure.

osv:CVE-2026-63306
Complete source record
{
  "id": "2452899ee8233b6c1408b0cb9b06bab0269ef1caa5383ebdfa4fb72dded4357b",
  "url": "https://osv.dev/vulnerability/CVE-2026-63306",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "stoatchat before 0.13.5 Unauthenticated SSRF via proxy and embed endpoints",
    "summary": "stoatchat before 0.13.5 contains an unauthenticated server-side request forgery vulnerability in the /proxy and /embed endpoints that accept arbitrary URLs without DNS resolution filtering or private IP range validation. Attackers can enumerate internal services, fingerprint applications, and reach instance metadata endpoints by supplying malicious URLs or leveraging redirect chains to access internal infrastructure.",
    "evidence": "osv:CVE-2026-63306",
    "products": [],
    "severity": "critical",
    "structured": {
      "id": "CVE-2026-63306",
      "aliases": [
        "CVE-2026-63306",
        "GHSA-xhww-5g9p-vvq5"
      ],
      "metrics": [
        {
          "type": "CVSS_V4",
          "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:H/SI:N/SA:N"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/stoatchat/stoatchat",
              "type": "GIT",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "6c920de03a275e73f1f632b6cd6bc924acb66324"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "range": [
                      {
                        "introduced": "0"
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                      {
                        "fixed": "0.13.5"
                      }
                    ],
                    "source": "AFFECTED_FIELD",
                    "strategy": "StandardRange"
                  },
                  {
                    "range": [
                      {
                        "introduced": "0"
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                      {
                        "fixed": "0.13.5"
                      }
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                    "source": "DESCRIPTION"
                  }
                ]
              }
            }
          ],
          "versions": [
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            "v0.13.3",
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          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-63306.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:31.258736459Z",
      "provider": "osv",
      "references": [
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/63xxx/CVE-2026-63306.json",
        "https://github.com/stoatchat/stoatchat/security/advisories/GHSA-xhww-5g9p-vvq5",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-63306",
        "https://www.vulncheck.com/advisories/stoatchat-before-unauthenticated-ssrf-via-proxy-and-embed-endpoints"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-918"
        ],
        "cna_assigner": "VulnCheck",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/63xxx/CVE-2026-63306.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-63306",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 498128,
  "published_at": "2026-07-16T12:19:17.351+00:00"
}