TI-2026-30452 Aliases CVE-2026-42084 GHSA-wgx6-g857-jjf7

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

HIGH 70CWE-620Published 2026-05-04 · Updated 2026-05-06

Key facts

Attack vector: Network
Privileges required: Low
User interaction: None
Attack complexity: Low
Impact type: —
Confidentiality · integrity · availability: High · High · None
Fix status: Fixed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA and GitHub.

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 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.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV

EPSS 0.00305 23rd percentileScored 2026-11-07

Public exploit Yes 1 exploit referenceTagged by NVD

Fix Fixed cosmos (OpenC3): 6.10.5, 7.0.0-rc3openc3 (RubyGems): 6.10.5, 7.0.0-rc3

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation: Poc
Automatable: No
Technical impact: Total

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
OpenC3	cosmos	before 6.10.5; 7.0.0.pre.rc1 to before 7.0.0-rc3	6.10.5, 7.0.0-rc3	Patch available	CNA
—	openc3 (RubyGems)	before 6.10.5	6.10.5	Patch available	GHSA-wgx6-g857-jjf7
—	openc3 (RubyGems)	7.0.0.pre.rc1 to before 7.0.0-rc3	7.0.0-rc3	Patch available	GHSA-wgx6-g857-jjf7

cosmos VendorOpenC3 Affected before 6.10.5; 7.0.0.pre.rc1 to before 7.0.0-rc3 Fixed in 6.10.5, 7.0.0-rc3 Patch available CNA
openc3 (RubyGems) Vendor— Affected before 6.10.5 Fixed in 6.10.5 Patch available GHSA-wgx6-g857-jjf7
openc3 (RubyGems) Vendor— Affected 7.0.0.pre.rc1 to before 7.0.0-rc3 Fixed in 7.0.0-rc3 Patch available GHSA-wgx6-g857-jjf7

CPE configurations NVD · 3

CPE	Versions	Role	Vendor
cpe:2.3:a:openc3:cosmos:::::open_source:::*	before 6.10.5	Vulnerable	OpenC3
cpe:2.3:a:openc3:cosmos:7.0.0:rc1:::open_source:::*	7.0.0 rc1	Vulnerable	OpenC3
cpe:2.3:a:openc3:cosmos:7.0.0:rc2:::open_source:::*	7.0.0 rc2	Vulnerable	OpenC3

cpe:2.3:a:openc3:cosmos:*:*:*:*:open_source:*:*:* Versions before 6.10.5 Vulnerable ·OpenC3
cpe:2.3:a:openc3:cosmos:7.0.0:rc1:*:*:open_source:*:*:* Versions 7.0.0 rc1 Vulnerable ·OpenC3
cpe:2.3:a:openc3:cosmos:7.0.0:rc2:*:*:open_source:*:*:* Versions 7.0.0 rc2 Vulnerable ·OpenC3

Remediation

Fix · CNA cosmos (OpenC3) Fixed in 6.10.5, 7.0.0-rc3
Fix · GHSA-wgx6-g857-jjf7 openc3 (RubyGems) Fixed in 6.10.5 Advisory →
Fix · GHSA-wgx6-g857-jjf7 openc3 (RubyGems) Fixed in 7.0.0-rc3 Advisory →

Timeline

2026-10-02 Threatist record created from CVE-2026-42084
2026-10-03 Alias added: GHSA-wgx6-g857-jjf7

References

Other 4

TI-2025-20781 Weak password requirements in OpenC3 COSMOS v6.0.0 allow attackers to bypass authentication via a brute force attack. CVSS 3.1CRITICAL 9.8
TI-2025-20780 OpenC3 COSMOS before v6.0.2 was discovered to contain hardcoded credentials for the Service Account. CVSS 3.1CRITICAL 9.8
TI-2025-20779 A remote code execution (RCE) vulnerability in the Plugin Management component of OpenC3… CVSS 3.1CRITICAL 9.8
TI-2025-20778 An issue in the /script-api/scripts/ endpoint of OpenC3 COSMOS before 6.1.0 allows… CVSS 3.1CRITICAL 9.1
TI-2026-30456 OpenC3 COSMOS: Administrative Actions via the Script Runner Tool CVSS 3.1CRITICAL 9.6
TI-2026-30455 OpenC3 COSMOS: SQL Injection in QuestDB Time-Series Data Base CVSS 3.1CRITICAL 9.6

See all 14 →

Sources

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