---
id: CVE-2026-49139
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 atta…
severity: high
cvss: 7
cvssVector: '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'
cvssSource: cna
cwe:
  - CWE-918
vendor: HKUDS
product: nanobot
affected:
  - nanobot < 0.2.1
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-06-02T15:27:12.755532Z'
published: '2026-06-01'
updated: '2026-11-08'
sourceUpdated: '2026-11-08T14:04:48.173Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-49139'
references:
  - url: 'https://github.com/HKUDS/nanobot/releases/tag/v0.2.1'
    label: nanobot 0.2.1 Release Notes
  - url: 'https://github.com/HKUDS/nanobot/pull/4047'
  - url: >-
      https://github.com/HKUDS/nanobot/commit/232df45126bcf0f8fccd123d73714f202c8e8612
  - url: >-
      https://www.vulncheck.com/advisories/nanobot-ssrf-via-microsoft-teams-channel-serviceurl-poisoning
tags:
  - cve.org
epss: 0.00382
epssPercentile: 0.32464
ingestedAt: '2026-11-08T14:51:22.386Z'
---

## Overview

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.

## Affected

- `nanobot < 0.2.1`

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.