affected:
- package:
    ecosystem: PyPI
    name: openc3
    purl: pkg:pypi/openc3
  ranges:
  - events:
    - introduced: '0'
    - fixed: 7.0.0
    type: ECOSYSTEM
  versions:
  - 0.1.0
  - 5.10.0
  - 5.10.1
  - 5.11.0
  - 5.11.1
  - 5.11.2
  - 5.11.3
  - 5.12.0
  - 5.13.0
  - 5.14.0
  - 5.14.1
  - 5.14.2
  - 5.15.0
  - 5.15.1
  - 5.15.2
  - 5.16.0
  - 5.16.1
  - 5.16.2
  - 5.17.0
  - 5.17.1
  - 5.18.0
  - 5.19.0
  - 5.20.0
  - 5.9.2b0
  - 6.0.0
  - 6.0.1
  - 6.0.2
  - 6.1.0
  - 6.10.0
  - 6.10.1
  - 6.10.2
  - 6.10.3
  - 6.10.4
  - 6.10.5
  - 6.10.6
  - 6.2.0
  - 6.2.1
  - 6.3.0
  - 6.4.0
  - 6.4.1
  - 6.4.2
  - 6.5.0
  - 6.5.1
  - 6.6.0
  - 6.7.0
  - 6.8.0
  - 6.8.1
  - 6.9.0
  - 6.9.1
  - 6.9.2
  - 7.0.0rc2
  - 7.0.0rc3
aliases:
- CVE-2026-42086
- GHSA-ffq5-qpvf-xq7x
details: "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, the Command\
  \ Sender UI uses an unsafe eval() function on array-like command parameters, which\
  \ allows a user-supplied payload to execute in the browser when sending a command.\
  \ This creates a self-XSS risk because an attacker can trigger their own script\
  \ execution in the victim\u2019s session, if allowed to influence the array parameter\
  \ input, for example via phishing. If successful, an attacker may read or modify\
  \ data in the authenticated browser context, including session tokens in local storage.\
  \ This issue has been patched in version 7.0.0."
id: PYSEC-2026-105
modified: '2026-05-20T09:19:10.269368Z'
published: '2026-05-04T18:16:30.667Z'
references:
- type: EVIDENCE
  url: https://github.com/OpenC3/cosmos/security/advisories/GHSA-ffq5-qpvf-xq7x
severity:
- score: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:L/I:L/A:N
  type: CVSS_V3