Is CVE-2026-49139 actively exploited?

No active exploitation of CVE-2026-49139 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2026-49139 be exploited remotely?

Yes. CVE-2026-49139 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2026-49139?

CVE-2026-49139 has a CVSS score of 7.0 (HIGH).

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HIGH

CVE-2026-49139

CWE-918Published: June 1, 2026· Updated: Jun 2, 2026

7.0

CVSS v3.1

EPSS:0.13%probability of exploitation in 30 daysPercentile:32.4th

Official 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.

NVD Source

Technical Analysis

CVE-2026-49139 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.

CVSS v3.1 Vector Breakdown

Exploitability

Attack VectorNetwork

Attack ComplexityLow

Privileges Req.None

User InteractionNone

ScopeX

Impact

Confidentiality

Integrity

Availability

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/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