PT-2026-45561 · Hkuds+1 · Nanobot

CVE-2026-49139 · Published 2026-06-01 · Updated 2026-07-22

Positive Technologies (AI Summary)

CVSS v4.0

7.0

High

Base vector

AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:L/VA:N/SC:H/SI:H/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

Name of the Vulnerable Software and Affected Versions Nanobot versions prior to 0.2.1

Description A server-side request forgery (SSRF) issue exists in the Microsoft Teams channel handler. This occurs when a remote attacker provides a forged activity containing a malicious serviceUrl value. By sending a crafted inbound activity to the Teams webhook, an attacker can poison the stored conversation reference. Consequently, subsequent bot replies will send Authorization header requests containing Bot Framework bearer tokens to a host controlled by the attacker.

Recommendations Update Nanobot to version 0.2.1 or later.

Exploit

Fix

SSRF

Weakness Enumeration

CWE-918

Related Identifiers

CVE-2026-49139

Affected Products

Nanobot

References · 9

• 🔥 https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/49xxx/CVE-2026-49139.json · Exploit
• https://github.com/HKUDS/nanobot/commit/232df45126bcf0f8fccd123d73714f202c8e8612 · Patch
• https://nvd.nist.gov/vuln/detail/CVE-2026-49139 · Security Note
• https://osv.dev/vulnerability/CVE-2026-49139 · Vendor Advisory
• https://github.com/HKUDS/nanobot/releases/tag/v0.2.1 · Note
• https://github.com/HKUDS/nanobot · Note
• https://github.com/HKUDS/nanobot/pull/4047 · Note
• https://t.me/cveNotify/211649 · Telegram Post
• https://vulncheck.com/advisories/nanobot-ssrf-via-microsoft-teams-channel-serviceurl-poisoning · Note