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CVE-2026-42085— OpenC3 COSMOS: Arbitrary write to plugins directory via path-traversed config filenames

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 6.10.5之前版本和7.0.0-rc3之前版本存在安全漏洞，该漏洞源于save_tool_config函数存在设计缺陷，允许通过提供特制配置文件名在共享插件目录树中任意位置保存工具配置文件，可能导致用户创建任意文件结构并覆盖现有配置文件。

CVSS 4.3 · Medium EPSS 0.41% · P34

Affected Version Matrix 2

VendorProduct Version RangeStatus
OpenC3 cosmos < 6.10.5 affected
>= 7.0.0.pre.rc1, < 7.0.0-rc3 affected
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I. Basic Information for CVE-2026-42085

Vulnerability Information
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Vulnerability Title
OpenC3 COSMOS: Arbitrary write to plugins directory via path-traversed config filenames
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 versions 6.10.5 and 7.0.0-rc3, OpenC3 COSMOS contains a design flaw in the save_tool_config() function that allows saving tool configuration files at arbitrary locations inside the shared /plugins directory tree by supplying crafted configuration filenames. Although the implementation sufficiently mitigates standard path traversal attacks, by canonicalizing filename to an absolute path, all plugins share this same root directory. That enables users to create arbitrary file structures and overwrite existing configuration files within the shared /plugins directory. This issue has been patched in versions 6.10.5 and 7.0.0-rc3.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
相对路径遍历
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 6.10.5之前版本和7.0.0-rc3之前版本存在安全漏洞，该漏洞源于save_tool_config函数存在设计缺陷，允许通过提供特制配置文件名在共享插件目录树中任意位置保存工具配置文件，可能导致用户创建任意文件结构并覆盖现有配置文件。
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)

Affected Products

Vendor Product Affected Versions CPE Subscribe
OpenC3 cosmos < 6.10.5 -

II. Public POCs for CVE-2026-42085

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III. Intelligence Information for CVE-2026-42085

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Patches & Fixes for CVE-2026-42085 (2)

Vendor Advisories for CVE-2026-42085 (1)

Vendor Pages for CVE-2026-42085 (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-2026-42088 9.6 CRITICAL OpenC3 COSMOS: Administrative Actions via the Script Runner Tool
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

IV. Related Vulnerabilities

Same product: cosmos
Same vendor: OpenC3
Same weakness: CWE-23

V. Comments for CVE-2026-42085

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