CVE-2026-6129Public exploitNetwork attack vector

Unauthenticated command execution via unprotected message endpoint

Published Apr 12, 2026 · Updated Apr 12, 2026

Missing authentication in the CowAgent Agent Mode Service 2.0.0 through 2.0.4 allows remote attackers to execute OS commands. The Web Console registers its /message route without authentication and binds the service to all network interfaces; submitted instructions can reach a shell-backed agent tool. Reachability to port 9899 with Agent mode and the web channel enabled is sufficient, and commands run with the CowAgent process user's file and network access.

CVSS severity7.3
High
EPSS probability0.39%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

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Summary

What happened

Missing authentication in the CowAgent Agent Mode Service 2.0.0 through 2.0.4 allows remote attackers to execute OS commands. The Web Console registers its /message route without authentication and binds the service to all network interfaces; submitted instructions can reach a shell-backed agent tool. Reachability to port 9899 with Agent mode and the web channel enabled is sufficient, and commands run with the CowAgent process user's file and network access.

The record

CVE
CVE-2026-6129
Published
Apr 12, 2026
Updated
Apr 12, 2026
Vendor
zhayujie
Product
CowAgent
Classifications
CWE-306, CWE-287, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Apr 12, 2026CVE publishedPublication date reported by the CVE source.
  2. Apr 12, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

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

  1. Affected versionversion=2.0.0
  2. Affected versionversion=2.0.1
  3. Affected versionversion=2.0.2
  4. Affected versionversion=2.0.3
  5. Affected versionversion=2.0.4

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

zhayujie · CowAgentversion=2.0.0; version=2.0.1; version=2.0.2; version=2.0.3; version=2.0.4

Published CVSS scores

7.3VulDBCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L
7.5VulDBAV:N/AC:L/Au:N/C:P/I:P/A:P
5.5VulDBCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E: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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-306Missing Authentication for Critical Function
CWE-287Improper Authentication
T1190Exploit Public-Facing Application

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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