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CVE-2026-42088— OpenC3 COSMOS: Administrative Actions via the Script Runner Tool

Quick assessment

Affected
OpenC3 cosmos
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

OpenC3 COSMOS是OpenC3开源的一个应用程序。 OpenC3 COSMOS 7.0.0-rc3之前版本存在安全漏洞，该漏洞源于Script Runner部件允许用户执行Python和Ruby脚本，可能导致用户绕过API权限检查并执行管理操作，包括读取和修改Redis数据库数据以及读写存储桶服务。

CVSS 9.6 · Critical EPSS 0.49% · P41

Affected Version Matrix 1

VendorProduct Version RangeStatus
OpenC3 cosmos < 7.0.0-rc3 affected
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I. Basic Information for CVE-2026-42088

Vulnerability Information
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Vulnerability Title
OpenC3 COSMOS: Administrative Actions via the Script Runner Tool
Source: CVE Program / CVE List V5
Vulnerability Description
OpenC3 COSMOS provides the functionality needed to send commands to and receive data from one or more embedded systems. Prior to version 7.0.0-rc3, the Script Runner widget allows users to execute Python and Ruby scripts directly from the openc3-COSMOS-script-runner-api container. Because all the docker containers share a network, users can execute specially crafted scripts to bypass the API permissions check and perform administrative actions, including reading and modifying data inside the Redis database, which can be used to read secrets and change COSMOS settings, as well as read and write to the buckets service, which holds configuration, log, and plugin files. These actions are normally only available from the Admin Console or with administrative privileges. Any user with permission to create and run scripts can connect to any service in the docker network. This issue has been patched in version 7.0.0-rc3.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
带着不必要的权限执行
Source: CVE Program / CVE List V5
Vulnerability Title
OpenC3 COSMOS 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
OpenC3 COSMOS是OpenC3开源的一个应用程序。 OpenC3 COSMOS 7.0.0-rc3之前版本存在安全漏洞，该漏洞源于Script Runner部件允许用户执行Python和Ruby脚本，可能导致用户绕过API权限检查并执行管理操作，包括读取和修改Redis数据库数据以及读写存储桶服务。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

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Affected Products

Vendor Product Affected Versions CPE Subscribe
OpenC3 cosmos < 7.0.0-rc3 -

II. Public POCs for CVE-2026-42088

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III. Intelligence Information for CVE-2026-42088

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Vendor Advisories for CVE-2026-42088 (1)

Vendor Pages for CVE-2026-42088 (2)

Same Patch Batch · OpenC3 · 2026-05-04 · 5 CVEs total

CVE-2026-42087 9.6 CRITICAL OpenC3 COSMOS: SQL Injection in QuestDB Time-Series Data Base
CVE-2026-42084 8.1 HIGH OpenC3 COSMOS: Hijacked session token can be used to reset password for persistence
CVE-2026-42086 4.6 MEDIUM OpenC3 COSMOS: Self-XSS in the Command Sender
CVE-2026-42085 4.3 MEDIUM OpenC3 COSMOS: Arbitrary write to plugins directory via path-traversed config filenames

IV. Related Vulnerabilities

Same product: cosmos
Same vendor: OpenC3
Same weakness: CWE-250

V. Comments for CVE-2026-42088

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