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OpenAdvisories
High · 8.1 CVE-2026-42084 EUVD-2026-27057GHSA-wgx6-g857-jjf7PYSEC-2026-2242

OpenC3 COSMOS: Hijacked session token can be used to reset password for persistence

Published May 4, 2026 · Updated May 6, 2026 · Assigned by GitHub_M

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

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

Affected packages

EcosystemPackageAffectedFixedRecord
PyPI openc3 < 6.10.5 6.10.5 PYSEC-2026-2242
RubyGems openc3 < 6.10.5 6.10.5 GHSA-wgx6-g857-jjf7
RubyGems openc3 >= 7.0.0.pre.rc1, < 7.0.0-rc3 7.0.0-rc3 GHSA-wgx6-g857-jjf7

References