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

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Summary

CVECVE-2026-42084
StatePUBLISHED
AssignerGitHub_M
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-05-04 18:16:30 UTC
Updated2026-05-04 18:16:30 UTC
DescriptionOpenC3 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.

Risk And Classification

Primary CVSS: v3.1 8.1 HIGH from [email protected]

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N

Problem Types: CWE-620 | CWE-620 CWE-620: Unverified Password Change

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary8.1HIGHCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N
3.1CNADECLARED8.1HIGHCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
None

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA OpenC3 Cosmos affected < 6.10.5 Not specified
CNA OpenC3 Cosmos affected >= 7.0.0.pre.rc1, < 7.0.0-rc3 Not specified

References

ReferenceSourceLinkTags
github.com/OpenC3/cosmos/releases/tag/v6.10.5 [email protected] github.com
github.com/OpenC3/cosmos/security/advisories/GHSA-wgx6-g857-jjf7 [email protected] github.com
github.com/OpenC3/cosmos/commit/2e623714e3426d5ae81b6f8239d4a2a6937ef776 [email protected] github.com
github.com/OpenC3/cosmos/releases/tag/v7.0.0-rc3 [email protected] github.com
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