CVE-2026-49139: Server-Side Request Forgery (SSRF) in HKUDS nanobot
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.
AI Analysis
Technical Summary
CVE-2026-49139 describes an SSRF vulnerability in the HKUDS nanobot product before version 0.2.1. The issue exists in the Microsoft Teams channel handler where an attacker can supply a crafted inbound activity containing an attacker-controlled serviceUrl. This leads to poisoning of the stored conversation reference, which causes subsequent bot replies to transmit Authorization headers containing bearer tokens to attacker-controlled endpoints. This vulnerability could allow remote attackers to exfiltrate sensitive authentication tokens from the bot framework.
Potential Impact
The vulnerability allows remote attackers to exfiltrate Bot Framework bearer tokens by exploiting the SSRF flaw. This can lead to unauthorized access or impersonation of the bot in Microsoft Teams channels. The CVSS 4.0 score of 7 (high severity) reflects the network attack vector, low attack complexity, and the potential for partial impact on integrity and high impact on system confidentiality and security integrity.
Mitigation Recommendations
No official patch or remediation is currently confirmed for this vulnerability. Users should check the vendor advisory for updates. Until a fix is available, avoid deploying vulnerable versions of nanobot or restrict access to the Teams webhook to trusted sources to reduce exposure.
CVE-2026-49139: Server-Side Request Forgery (SSRF) in HKUDS nanobot
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.
CVSS v4.0
Score 7.0high
Affected software
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AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
CVE-2026-49139 describes an SSRF vulnerability in the HKUDS nanobot product before version 0.2.1. The issue exists in the Microsoft Teams channel handler where an attacker can supply a crafted inbound activity containing an attacker-controlled serviceUrl. This leads to poisoning of the stored conversation reference, which causes subsequent bot replies to transmit Authorization headers containing bearer tokens to attacker-controlled endpoints. This vulnerability could allow remote attackers to exfiltrate sensitive authentication tokens from the bot framework.
Potential Impact
The vulnerability allows remote attackers to exfiltrate Bot Framework bearer tokens by exploiting the SSRF flaw. This can lead to unauthorized access or impersonation of the bot in Microsoft Teams channels. The CVSS 4.0 score of 7 (high severity) reflects the network attack vector, low attack complexity, and the potential for partial impact on integrity and high impact on system confidentiality and security integrity.
Mitigation Recommendations
No official patch or remediation is currently confirmed for this vulnerability. Users should check the vendor advisory for updates. Until a fix is available, avoid deploying vulnerable versions of nanobot or restrict access to the Teams webhook to trusted sources to reduce exposure.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- VulnCheck
- Date Reserved
- 2026-05-27T17:40:12.738Z
- Cvss Version
- 4.0
- State
- PUBLISHED
- Remediation Level
- null
Threat ID: 6a1de934e29bf47b503e848c
Added to database: 06/01/2026, 20:19:00 UTC
Last enriched: 07/30/2026, 00:45:22 UTC
Last updated: 07/31/2026, 21:26:47 UTC
Views: 98
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