CVE-2026-49139: Hkuds Nanobot

High severity, CVSS 7.0. EPSS: 0.7% chance of exploitation in the next 30 days.

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 products

• Hkuds Nanobot: before 0.2.1 (fixed in 0.2.1)

Published 2026-06-01. Last modified 2026-07-22.