CVE-2026-49139

Nanobot < 0.2.1 SSRF via Microsoft Teams Channel serviceUrl Poisoning

Published Jun 1, 2026 CVSS 4.0 · 7 High EPSS < 1% KEV · Not listed
Description
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.

Remediation

No solution or workaround provided in the CVE record

Tracking

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Advisories

No advisories available
History
Type Values Removed Values Added
First Time appeared Nanobot
Nanobot nanobot
CPEs cpe:2.3:a:nanobot:nanobot:*:*:*:*:*:python:*:*
Vendors & Products Nanobot
Nanobot nanobot
Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Type Values Removed Values Added
First Time appeared Hkuds
Hkuds nanobot
Vendors & Products Hkuds
Hkuds nanobot
Type Values Removed Values Added
Description 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.
Title Nanobot < 0.2.1 SSRF via Microsoft Teams Channel serviceUrl Poisoning
Weaknesses CWE-918
References
Metrics cvssV4_0

{'score': 7, 'vector': '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'}

Weaknesses

Sources

Status
PUBLISHED
Assigner
VulnCheck
Published
Updated
Nov 8, 2026, 2:04 PM
Reserved
May 27, 2026, 5:40 PM
Status
Deferred
Published
Jun 1, 2026, 9:16 PM
Modified
Jul 22, 2026, 8:10 AM