# CVE-2026-42084

## Summary

- **CVE ID:** CVE-2026-42084
- **Severity:** HIGH
- **CVSS Score:** 8.1 (CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N)
- **CWE:** CWE-620
- **Published:** May 4, 2026
- **Last Modified:** May 6, 2026

## 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.

## Affected Products

- OpenC3 — cosmos (< 6.10.5)
- OpenC3 — cosmos (>= 7.0.0.pre.rc1, < 7.0.0-rc3)

## References

- [CNA](https://github.com/OpenC3/cosmos/security/advisories/GHSA-wgx6-g857-jjf7)
- [CNA](https://github.com/OpenC3/cosmos/commit/2e623714e3426d5ae81b6f8239d4a2a6937ef776)
- [CNA](https://github.com/OpenC3/cosmos/releases/tag/v6.10.5)
- [CNA](https://github.com/OpenC3/cosmos/releases/tag/v7.0.0-rc3)

## Exploitation Prediction (EPSS)

- **EPSS Score:** 0.30%
- **EPSS Percentile:** 22.9

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_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-11._