CVE-2026-19244Public exploitNetwork attack vector

Unauthorized MCP capability access via incomplete allowlist

Published Aug 7, 2026 · Updated Aug 7, 2026

Improper access control in nanobot 0.2.0 through 0.2.1 allows remote authenticated users to invoke denied MCP resources and prompts. The connect_mcp_servers function filters session.list_tools results but unconditionally registers wrappers from session.list_resources and session.list_prompts. Exposure requires a configured MCP server and a restrictive enabledTools policy; reachable content or workflows depend on that server's resources and prompts.

CVSS severity4.7
Medium
EPSS probability0.27%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper access control in nanobot 0.2.0 through 0.2.1 allows remote authenticated users to invoke denied MCP resources and prompts. The connect_mcp_servers function filters session.list_tools results but unconditionally registers wrappers from session.list_resources and session.list_prompts. Exposure requires a configured MCP server and a restrictive enabledTools policy; reachable content or workflows depend on that server's resources and prompts.

The record

CVE
CVE-2026-19244
Published
Aug 7, 2026
Updated
Aug 7, 2026
Vendor
Data Intelligence Lab @ HKU
Product
nanobot
Classifications
CWE-284, CWE-266
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Aug 7, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 7, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0.2.0
  2. Affected versionversion=0.2.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Data Intelligence Lab @ HKU · nanobotversion=0.2.0; version=0.2.1

Published CVSS scores

4.7VulDBCVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:L/I:L/A:L
2.0VulDBCVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:P
5.8VulDBAV:N/AC:L/Au:M/C:P/I:P/A:P

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-284Improper Access Control
CWE-266Incorrect Privilege Assignment

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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