CVE-2026-77602Public exploitNetwork attack vectorHinoki check available

Authenticated code execution via writable configuration overlay

Published Sep 23, 2026 · Updated Sep 23, 2026

Code injection in OpenC3 COSMOS 5.1.0 through 7.2.1 allows remote authenticated users to execute code through configuration APIs. The targets_modified overlay accepts non-admin writes, then ConfigParser renders files as ERB, GenericConversion evaluates Ruby or Python, and suite analysis requires procedure files. Valid authentication and lower-tier system_set, system, script_edit, or script_view permissions are sufficient, exposing service credentials and command, telemetry, and configuration data.

CVSS severity9.9
Critical
EPSS probability0.57%
Next 30 days · Oct 19, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkAvailable
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Summary

What happened

Code injection in OpenC3 COSMOS 5.1.0 through 7.2.1 allows remote authenticated users to execute code through configuration APIs. The targets_modified overlay accepts non-admin writes, then ConfigParser renders files as ERB, GenericConversion evaluates Ruby or Python, and suite analysis requires procedure files. Valid authentication and lower-tier system_set, system, script_edit, or script_view permissions are sufficient, exposing service credentials and command, telemetry, and configuration data.

The record

CVE
CVE-2026-77602
Published
Sep 23, 2026
Updated
Sep 23, 2026
Vendor
OpenC3
Product
COSMOS
Classifications
CWE-94, T1190
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Sep 23, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 23, 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=>= 5.1.0, < 7.3.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

OpenC3 · COSMOSversion=>= 5.1.0, < 7.3.0

Published CVSS scores

9.9GitHubCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/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.

Activity data is delayed. The latest report is Sep 28, 2026.

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

No observations available

Sep 22, 2026Sep 28, 2026
Latest reporting daySep 28, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-94Improper Control of Generation of Code ('Code Injection')
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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