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CVE-2026-42084— OpenC3 COSMOS: Hijacked session token can be used to reset password for persistence

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，该漏洞源于密码更改功能允许用户在不提供旧密码的情况下通过有效会话令牌更改密码，可能导致攻击者在已获取有效会话令牌的情况下劫持账户并阻止合法用户访问。

CVSS 8.1 · High EPSS 0.44% · P37

Possible ATT&CK Techniques 1 AI

T1136.001 · Local Account

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-2026-42084

Vulnerability Information
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Vulnerability Title
OpenC3 COSMOS: Hijacked session token can be used to reset password for persistence
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, the OpenC3 password change functionality allows a user to change their password without providing the old password, by accepting a valid session token instead. In assumed breach scenarios, this behaviour can be exploited by an attacker who has already obtained a valid session token, to gain persistence in hijacked account (including admin) and prevent legitimate users from accessing the account. 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:H/I:H/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
未经验证的口令修改
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，该漏洞源于密码更改功能允许用户在不提供旧密码的情况下通过有效会话令牌更改密码，可能导致攻击者在已获取有效会话令牌的情况下劫持账户并阻止合法用户访问。
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-2026-42084

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III. Intelligence Information for CVE-2026-42084

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Patches & Fixes for CVE-2026-42084 (1)

Vendor Advisories for CVE-2026-42084 (1)

Vendor Pages for CVE-2026-42084 (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-2026-42086 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-620

V. Comments for CVE-2026-42084

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