Staging Environment: Content and features may be unstable or change without notice.
Search for vulnerabilities
Vulnerability details: VCID-xsbe-s126-qycf
Vulnerability ID VCID-xsbe-s126-qycf
Aliases CVE-2026-42084
GHSA-wgx6-g857-jjf7
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.
Status Published
Exploitability 0.5
Weighted Severity 8.0
Risk 4.0
Affected and Fixed Packages Package Details
Weaknesses (3)
CWE-620 Unverified Password Change
CWE-937 OWASP Top Ten 2013 Category A9 - Using Components with Known Vulnerabilities
CWE-1035 OWASP Top Ten 2017 Category A9 - Using Components with Known Vulnerabilities
System Score Found at
epss 0.00038 https://api.first.org/data/v1/epss?cve=CVE-2026-42084
epss 0.00038 https://api.first.org/data/v1/epss?cve=CVE-2026-42084
epss 0.00038 https://api.first.org/data/v1/epss?cve=CVE-2026-42084
epss 0.00038 https://api.first.org/data/v1/epss?cve=CVE-2026-42084
cvssv3.1_qr HIGH https://github.com/advisories/GHSA-wgx6-g857-jjf7
cvssv3.1 8.1 https://github.com/OpenC3/cosmos
generic_textual HIGH https://github.com/OpenC3/cosmos
cvssv3.1 8.1 https://github.com/OpenC3/cosmos/commit/2e623714e3426d5ae81b6f8239d4a2a6937ef776
generic_textual HIGH https://github.com/OpenC3/cosmos/commit/2e623714e3426d5ae81b6f8239d4a2a6937ef776
ssvc Track* https://github.com/OpenC3/cosmos/commit/2e623714e3426d5ae81b6f8239d4a2a6937ef776
cvssv3.1 8.1 https://github.com/OpenC3/cosmos/releases/tag/v6.10.5
generic_textual HIGH https://github.com/OpenC3/cosmos/releases/tag/v6.10.5
ssvc Track* https://github.com/OpenC3/cosmos/releases/tag/v6.10.5
cvssv3.1 8.1 https://github.com/OpenC3/cosmos/releases/tag/v7.0.0-rc3
generic_textual HIGH https://github.com/OpenC3/cosmos/releases/tag/v7.0.0-rc3
ssvc Track* https://github.com/OpenC3/cosmos/releases/tag/v7.0.0-rc3
cvssv3 8.1 https://github.com/OpenC3/cosmos/security/advisories/GHSA-wgx6-g857-jjf7
cvssv3.1 8.1 https://github.com/OpenC3/cosmos/security/advisories/GHSA-wgx6-g857-jjf7
cvssv3.1_qr HIGH https://github.com/OpenC3/cosmos/security/advisories/GHSA-wgx6-g857-jjf7
generic_textual HIGH https://github.com/OpenC3/cosmos/security/advisories/GHSA-wgx6-g857-jjf7
ssvc Track* https://github.com/OpenC3/cosmos/security/advisories/GHSA-wgx6-g857-jjf7
cvssv3.1 8.1 https://github.com/rubysec/ruby-advisory-db/blob/master/gems/openc3/CVE-2026-42084.yml
generic_textual HIGH https://github.com/rubysec/ruby-advisory-db/blob/master/gems/openc3/CVE-2026-42084.yml
cvssv3.1 8.1 https://nvd.nist.gov/vuln/detail/CVE-2026-42084
generic_textual HIGH https://nvd.nist.gov/vuln/detail/CVE-2026-42084
Reference id Reference type URL
https://api.first.org/data/v1/epss?cve=CVE-2026-42084
https://github.com/OpenC3/cosmos
https://github.com/rubysec/ruby-advisory-db/blob/master/gems/openc3/CVE-2026-42084.yml
https://nvd.nist.gov/vuln/detail/CVE-2026-42084
2e623714e3426d5ae81b6f8239d4a2a6937ef776 https://github.com/OpenC3/cosmos/commit/2e623714e3426d5ae81b6f8239d4a2a6937ef776
GHSA-wgx6-g857-jjf7 https://github.com/advisories/GHSA-wgx6-g857-jjf7
GHSA-wgx6-g857-jjf7 https://github.com/OpenC3/cosmos/security/advisories/GHSA-wgx6-g857-jjf7
v6.10.5 https://github.com/OpenC3/cosmos/releases/tag/v6.10.5
v7.0.0-rc3 https://github.com/OpenC3/cosmos/releases/tag/v7.0.0-rc3
No exploits are available.
Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N Found at https://github.com/OpenC3/cosmos
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N Found at https://github.com/OpenC3/cosmos/commit/2e623714e3426d5ae81b6f8239d4a2a6937ef776
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Vector: SSVCv2/E:P/A:N/T:T/P:M/B:A/M:M/D:R/2026-05-06T13:39:31Z/ Found at https://github.com/OpenC3/cosmos/commit/2e623714e3426d5ae81b6f8239d4a2a6937ef776
Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N Found at https://github.com/OpenC3/cosmos/releases/tag/v6.10.5
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Vector: SSVCv2/E:P/A:N/T:T/P:M/B:A/M:M/D:R/2026-05-06T13:39:31Z/ Found at https://github.com/OpenC3/cosmos/releases/tag/v6.10.5
Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N Found at https://github.com/OpenC3/cosmos/releases/tag/v7.0.0-rc3
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Vector: SSVCv2/E:P/A:N/T:T/P:M/B:A/M:M/D:R/2026-05-06T13:39:31Z/ Found at https://github.com/OpenC3/cosmos/releases/tag/v7.0.0-rc3
Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N Found at https://github.com/OpenC3/cosmos/security/advisories/GHSA-wgx6-g857-jjf7
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Vector: SSVCv2/E:P/A:N/T:T/P:M/B:A/M:M/D:R/2026-05-06T13:39:31Z/ Found at https://github.com/OpenC3/cosmos/security/advisories/GHSA-wgx6-g857-jjf7
Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N Found at https://github.com/rubysec/ruby-advisory-db/blob/master/gems/openc3/CVE-2026-42084.yml
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N Found at https://nvd.nist.gov/vuln/detail/CVE-2026-42084
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Exploit Prediction Scoring System (EPSS)
Percentile 0.11674
EPSS Score 0.00038
Published At June 11, 2026, 12:55 p.m.
Date Actor Action Source VulnerableCode Version
2026-06-11T16:44:21.760786+00:00 Vulnrichment Import https://github.com/cisagov/vulnrichment/blob/develop/2026/42xxx/CVE-2026-42084.json 38.6.0