CVE-2026-49139

High

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.

SeverityHigh

CVSS7.0

Exploit probability—

ProductHkuds Nanobot

PublishedJun 1, 2026

First seenJun 1, 2026

Weakness typeCWE-918Server-side request forgery (SSRF)

How to fix

Update

HKUDS nanobot0.2.1 or later

Patches

github.com/HKUDS/nanobot/commit/232df45126bcf0f8fccd123d73714f202c8e8612

Vendor advisories

github.com/HKUDS/nanobot/releases/tag/v0.2.1

Affected products

Product	Affected versions	Fixed in
HKUDS nanobot	v < 0.2.1	0.2.1

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