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Vulnerabilities CVE-2026-49139

CVE-2026-49139

High
Open
TLP:CLEAR

Nanobot < 0.2.1 SSRF via Microsoft Teams Channel serviceUrl Poisoning

NVD CVE.org
Critical Infrastructure

AI Analysis

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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.

Details

CVSS Score
7.0
EPSS Score
0.38%

31.2th percentile

CVSS 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
Confidence
90%
Published
Jun 1, 2026
Last Modified
Jul 28, 2026
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