CVE-2026-49139
Nanobot < 0.2.1 SSRF via Microsoft Teams Channel serviceUrl Poisoning
- State
- Published
- Severity
- 7.0 High
- Published
- Jun 1, 2026
- Updated
- Jul 28, 2026
- Reserved
- May 27, 2026
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.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 4.0 | 7.0 High | CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:L/VA:N/SC:H/SI:H/SA:N | VulnCheck |
Weaknesses
- CWE-918 Server-Side Request Forgery (SSRF)
Affected Products
| Product | Versions |
|---|---|
nanobotHKUDS |
|
References
- https://github.com/HKUDS/nanobot/releases/tag/v0.2.1release-notes
- https://github.com/HKUDS/nanobot/pull/4047issue-tracking
- https://github.com/HKUDS/nanobot/commit/232df45126bcf0f8fccd123d73714f202c8e8612patch
- https://www.vulncheck.com/advisories/nanobot-ssrf-via-microsoft-teams-channel-serviceurl-poisoningthird-party-advisory
Every record here comes from the CVE Program’s CVE List. © 1999–2026 The MITRE Corporation. CVE is a registered trademark of The MITRE Corporation. The records are reproduced under the CVE Program terms of use.