Nanobot < 0.2.1 SSRF via Microsoft Teams Channel serviceUrl Poisoning

{
  "id": "2152a15460b40e7498a7ece60f8375f7628be17249ee74110dfdd2b93c8c80fe",
  "url": "https://osv.dev/vulnerability/CVE-2026-49139",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "Nanobot < 0.2.1 SSRF via Microsoft Teams Channel serviceUrl Poisoning",
    "summary": "Nanobot prior to version 0.2.1 contains a server-side request forgery vulnerability in the Microsoft Teams channel handler that allows remote attackers to exfiltrate Bot Framework bearer tokens by supplying a forged activity with an attacker-controlled serviceUrl value. Attackers can poison the stored conversation reference by sending a crafted inbound activity to the Teams webhook, causing subsequent bot replies to transmit token-bearing Authorization header requests to an attacker-controlled host.",
    "evidence": "osv:CVE-2026-49139",
    "products": [],
    "severity": "high",
    "structured": {
      "id": "CVE-2026-49139",
      "aliases": [
        "CVE-2026-49139"
      ],
      "metrics": [
        {
          "type": "CVSS_V4",
          "score": "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:L/VA:N/SC:H/SI:H/SA:N"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/hkuds/nanobot",
              "type": "GIT",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "f309982bb0a2dca76dd038473ee6f1be803bd503"
                },
                {
                  "fixed": "232df45126bcf0f8fccd123d73714f202c8e8612"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "fixed": "0.2.1"
                      }
                    ],
                    "source": "AFFECTED_FIELD",
                    "strategy": "StandardRange"
                  },
                  {
                    "range": [
                      {
                        "fixed": "f309982bb0a2dca76dd038473ee6f1be803bd503"
                      }
                    ],
                    "source": "REFERENCES_TAG",
                    "original_tag": "v0.2.1"
                  },
                  {
                    "range": [
                      {
                        "fixed": "232df45126bcf0f8fccd123d73714f202c8e8612"
                      }
                    ],
                    "source": "REFERENCES_COMMIT"
                  }
                ]
              }
            }
          ],
          "versions": [
            "v0.2.0",
            "v0.1.5.post3",
            "v0.1.5.post2",
            "v0.1.5.post1",
            "v0.1.5",
            "v0.1.4.post6",
            "v0.1.4.post4",
            "v0.1.4.post3",
            "v0.1.4.post2",
            "v0.1.4.post1",
            "v0.1.4",
            "v0.1.3.post6",
            "v0.1.3.post5",
            "v0.1.3.post4"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-49139.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:45.120219256Z",
      "provider": "osv",
      "references": [
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/49xxx/CVE-2026-49139.json",
        "https://github.com/HKUDS/nanobot/releases/tag/v0.2.1",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-49139",
        "https://www.vulncheck.com/advisories/nanobot-ssrf-via-microsoft-teams-channel-serviceurl-poisoning",
        "https://github.com/HKUDS/nanobot/pull/4047",
        "https://github.com/HKUDS/nanobot/commit/232df45126bcf0f8fccd123d73714f202c8e8612",
        "https://github.com/HKUDS/nanobot"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-918"
        ],
        "cna_assigner": "VulnCheck",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/49xxx/CVE-2026-49139.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-49139",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 513291,
  "published_at": "2026-06-01T19:50:42.993+00:00"
}