CVE-2026-56694

MEDIUM 5.4

NanoClaw < 2.1.0 - Privilege Escalation via Forged Channel Approval Callback

CVSS Score

5.4

EPSS Score

0.0%

EPSS Percentile

0th

NanoClaw before 2.1.0 contains a privilege escalation vulnerability in the channel-registration approval flow where handleChannelApprovalResponse fails to validate admin privileges over target agent groups. Scoped admins can submit forged or stale connect callback values to wire messaging channels into out-of-scope agent groups, exposing unauthorized groups to unapproved channels and enabling unauthorized observation or control of restricted agent group activity.

CWE	CWE-863
Vendor	nanocoai
Product	nanoclaw
Published	Jun 23, 2026

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CVSS v3 Breakdown

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N

Attack Vector

Network

Attack Complexity

Low

Privileges Required

Low

User Interaction

None

Scope

Unchanged

Confidentiality

Low

Integrity

Low

Availability

None

Affected Versions

nanocoai / nanoclaw

0 < 2.1.0

References

NVD ↗ CVE.org ↗ EPSS Data ↗

github.com: https://github.com/nanocoai/nanoclaw/pull/2566 github.com: https://github.com/nanocoai/nanoclaw/commit/0eef8fafdd7c475ab5fd8d37ea566a81e74cd834 vulncheck.com: https://www.vulncheck.com/advisories/nanoclaw-privilege-escalation-via-forged-channel-approval-callback

Credits

Chia Min Jun Lennon