CVE-2026-30303Public exploitNetwork attack vector

Unauthenticated command execution via Windows parser mismatch

Published Mar 27, 2026 · Updated Mar 27, 2026

OS command injection in MatterAI Axon Code 4.123.1 and earlier allows remote attackers to execute arbitrary commands on Windows. The auto-approval module applies Unix shell-quote rules, causing Windows CMD caret escapes to conceal an ampersand connector inside a purported Git argument. No account or user interaction is required; a crafted tool-call command that passes the Git allowlist executes through CMD with the agent's privileges.

CVSS severity9.8
Critical
EPSS probability1.38%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

OS command injection in MatterAI Axon Code 4.123.1 and earlier allows remote attackers to execute arbitrary commands on Windows. The auto-approval module applies Unix shell-quote rules, causing Windows CMD caret escapes to conceal an ampersand connector inside a purported Git argument. No account or user interaction is required; a crafted tool-call command that passes the Git allowlist executes through CMD with the agent's privileges.

The record

CVE
CVE-2026-30303
Published
Mar 27, 2026
Updated
Mar 27, 2026
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-78, T1059.003
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Mar 27, 2026CVE publishedPublication date reported by the CVE source.
  2. Mar 27, 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?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

9.8CISA-ADPCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

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
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-78Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')
T1059.003Windows Command Shell

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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