Vulnerability 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.
Related Weaknesses (CWE)
References
- https://github.com/HKUDS/nanobot/commit/232df45126bcf0f8fccd123d73714f202c8e8612
- https://github.com/HKUDS/nanobot/pull/4047
- https://github.com/HKUDS/nanobot/releases/tag/v0.2.1
- https://www.vulncheck.com/advisories/nanobot-ssrf-via-microsoft-teams-channel-se
FAQ
What is CVE-2026-49139?
CVE-2026-49139 is a documented vulnerability. 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 sup...
How severe is CVE-2026-49139?
CVSS scoring is not yet available for CVE-2026-49139. Check NVD for updates.
Is there a patch for CVE-2026-49139?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.