CVE-2026-49139 — Nanobot < 0.2.1 SSRF via Microsoft Teams Channel serviceUrl Poisoning
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 Framewo…
Published: 2026-06-01 · CVSS: 7.0 · CVSS 4.0
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.
Source: CVE Program · Revision 8b16575c39f1e1810c5e863010da073d2d3285e7