What is the CVSS score of CVE-2026-90807?

CVE-2026-90807 has a CVSS 4.0 base score of 2.1 (Low). CVSS vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:P. EPSS exploitation probability: 0.3%.

Is there a public PoC exploit available for CVE-2026-90807?

Yes, a public proof-of-concept exploit is available for CVE-2026-90807. Prioritise patching immediately. EPSS: 0.3%.

Is there a patch available for CVE-2026-90807?

Yes, a patch is available for CVE-2026-90807. Update the affected software to the latest version immediately.

Nanoclaw CVE-2026-90807

EUVD-2026-77704 LOW

Improper Link Resolution Before File Access (CWE-59)

2026-09-14 VulDB

GHSA-6pc7-x5hm-c6fj

Information Disclosure Nanoclaw Nanocoai

2.1

CVSS 4.0 · Vendor: VulDB

View

Vulnerability Assessment

Weakness

CWE

CWE-59

OWASP Top 10:2025

A01:2025 - Broken Access Control

ASVS 5.0

V5 - File Handling Symlink resolution safety

Monitor Track and reassess. Why: LOW severity (CVSS 0.1-3.9).

Patch available 0.3% exploitation probability (EPSS)

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AnalysisAIv1 – Sep 16, 2026

Link-following (symlink) handling in NanoClaw's agent-to-agent attachment forwarding lets an authenticated, low-privileged user cause the service to read or modify files outside the intended attachment directory. The flaw is in forwardAttachedFiles() in src/modules/agent-to-agent/agent-route.ts and affects every NanoClaw release from 2.1.0 through 2.1.17; the attack is network-reachable and requires no user interaction. Public exploit code exists and the vendor fix is identified as commit 3f9ed607b7e7a4872747295f75286f1c377d7c33, but real-world risk is currently low (CVSS 4.0 base 2.1, EPSS 0.29%, no CISA KEV listing).

Affected VersionsENISA

NanoClaw 2.1.13

NanoClaw 2.1.8

NanoClaw 2.1.6

NanoClaw 2.1.14

NanoClaw 2.1.3

NanoClaw 2.1.5

NanoClaw 2.1.16

NanoClaw 2.1.17

NanoClaw 2.1.9

NanoClaw 2.1.10

NanoClaw 2.1.15

NanoClaw 2.1.2

NanoClaw 2.1.11

NanoClaw 2.1.12

NanoClaw 2.1.1

NanoClaw 2.1.4

NanoClaw 2.1.0

NanoClaw 2.1.7

Affected Packages

euvd nanoclaw no fix

Source: OSV (Open Source Vulnerabilities)

Affects your stack

Affects 1 package in euvd

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Exploit and PoC references, threat intelligence from 22 sources

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Severity by source

Vendor (VulDB) PRIMARY 2.1 MEDIUM

CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:P

Primary rating from Vendor (VulDB) · only source for this CVE.

CVSS VectorVendor: VulDB

Attack Vector

Network

Attack Complexity

Low

Attack Requirements

None

Privileges Required

Low

User Interaction

None

Vulnerable system: Confidentiality

Low

Vulnerable system: Integrity

Low

Vulnerable system: Availability

Low

Subsequent system: Confidentiality

None

Subsequent system: Integrity

None

Subsequent system: Availability

None

Lifecycle Timeline

Severity Changed

Sep 14, 2026 - 18:37 NVD

MEDIUM LOW

CVSS changed

Sep 14, 2026 - 18:37 NVD

5.3 (MEDIUM) 2.1 (LOW)

CVE Published

Sep 14, 2026 - 17:45 cve.org

LOW 2.1

DescriptionCVE.org

A vulnerability was found in nanocoai NanoClaw up to 2.1.17. This issue affects the function forwardAttachedFiles of the file src/modules/agent-to-agent/agent-route.ts of the component Attachment Handler. The manipulation results in link following. The attack may be performed from remote. The exploit has been made public and could be used. The patch is identified as 3f9ed607b7e7a4872747295f75286f1c377d7c33. It is advisable to implement a patch to correct this issue.

Threat Intelligence Overview

EPSS Score

0.3%

Top 79% exploitable

Exploit

POC

Public exploit code exists

Data Quality

7 sources

Confidence: High

EUVD

NVD

CVE.org

EPSS CIRCL

GitHub

VulDB

How this decision was reached

The engine reads each signal below and applies a fixed list of rules from top to bottom. The first rule that matches sets the recommended action – like a statement, every line is shown.

SignalValue

Severity LOW

CISA KEV No

Public POC Yes

EPSS 0.3%

Patch available Yes

Active threat No

Deciding rule

LOW severity (CVSS 0.1-3.9)

What every action level means

Emergency Immediate action required. Criteria: CRITICAL + in CISA KEV (actively exploited) without patch, OR CRITICAL + EPSS > 30% without patch, OR CRITICAL + active threat signals without patch.

Act Now Prioritize within 24-48h. Criteria: in KEV with patch available, OR CRITICAL + public POC, OR HIGH + EPSS > 10%, OR CRITICAL + active threat, OR any CRITICAL severity.

This Week Schedule remediation this week. Criteria: HIGH severity (CVSS 7.0-8.9). Patch within normal change window.

This Month Plan within 30 days. Criteria: MEDIUM severity (CVSS 4.0-6.9), lower exploitation probability. Include in regular patch cycle.

Monitor Track and reassess. Criteria: LOW severity (CVSS 0.1-3.9), minimal exploitation risk. No immediate action needed.

SSVC AssessmentENISA

SSVC Decision· derived

Scheduled

Exploitation· derived

Poc

System Exposure· derived

Open

Automatable· derived

Human Impact· derived

Low

Priority Score

Low Medium High Critical

KEV: 0

EPSS: 0

CVSS: +10

PoC: +20

Weaponized: 0

Threat intel: 0

Gov advisory: 0

Attack Technique

Information Disclosure MEDIUM

Information disclosure occurs when an application unintentionally exposes sensitive data that aids attackers in reconnaissance or directly compromises security.