What’s Vulnerable › Vulnerabilities

CVE-2026-49139: Nanobot < 0.2.1 SSRF via Microsoft Teams Channel serviceUrl Poisoning

• Severity: high (CVSS 7.0 v4.0)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.4% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-06-01 · updated 2026-07-22
• Weakness: CWE-918

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.

Affected products

• HKUDS nanobot: before 0.2.1 — fixed in 0.2.1

How to fix

Upgrade to a fixed version: HKUDS nanobot 0.2.1. Check the vendor advisory for mitigations.

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-serviceurl-poisoning

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