---
id: CVE-2026-42084
aliases:
  - PYSEC-2026-2242
  - GHSA-wgx6-g857-jjf7
title: >-
  OpenC3 COSMOS provides the functionality needed to send commands to and
  receive data from one or more embedded systems. Prior to versions…
summary: >-
  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 passwo…
severity: high
cvss: 8.1
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N'
vendor: openc3
product: openc3
ecosystem: pip
affected:
  - openc3 < 6.10.5
patched:
  - openc3 6.10.5
published: '2026-05-04'
updated: '2026-07-13'
source: OSV
sourceUrl: 'https://osv.dev/vulnerability/PYSEC-2026-2242'
references:
  - url: 'https://github.com/OpenC3/cosmos/releases/tag/v6.10.5'
  - url: 'https://github.com/OpenC3/cosmos/releases/tag/v7.0.0-rc3'
  - url: >-
      https://github.com/OpenC3/cosmos/commit/2e623714e3426d5ae81b6f8239d4a2a6937ef776
  - url: 'https://github.com/OpenC3/cosmos/security/advisories/GHSA-wgx6-g857-jjf7'
tags:
  - osv
  - pip
epss: 0.0044
epssPercentile: 0.35649
ingestedAt: '2026-07-13T18:58:08.414Z'
---

## Overview

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.

## Affected packages

- `openc3 < 6.10.5`

## Remediation

Upgrade to a patched release:

- `openc3 6.10.5`