{"action":"Upgrade openc3 to 6.10.5 or later.","affected":[{"fixed":"6.10.5","introduced":"0"},{"fixed":"7.0.0-rc3","introduced":"7.0.0.pre.rc1"}],"component":"openc3","cve_ids":["CVE-2026-42084"],"ecosystem":"RubyGems","epss":0.0044,"exploited":false,"fixed_versions":["6.10.5","7.0.0-rc3"],"ghsa_id":"GHSA-wgx6-g857-jjf7","id":"tcs_01M5KENY39C99NH032X66S2CEG","modified_at":"2026-09-10T03:51:03.787815850Z","published_at":"2026-04-22T22:13:10Z","references":["https://osv.dev/vulnerability/GHSA-wgx6-g857-jjf7","https://github.com/OpenC3/cosmos/security/advisories/GHSA-wgx6-g857-jjf7","https://nvd.nist.gov/vuln/detail/CVE-2026-42084","https://github.com/OpenC3/cosmos/commit/2e623714e3426d5ae81b6f8239d4a2a6937ef776","https://github.com/OpenC3/cosmos","https://github.com/OpenC3/cosmos/releases/tag/v6.10.5","https://github.com/OpenC3/cosmos/releases/tag/v7.0.0-rc3","https://github.com/rubysec/ruby-advisory-db/blob/master/gems/openc3/CVE-2026-42084.yml"],"severity":{"label":"high","score":8.1},"sources":[{"source":"osv","source_id":"GHSA-wgx6-g857-jjf7","url":"https://osv.dev/vulnerability/GHSA-wgx6-g857-jjf7"}],"summary":"OpenC3 COSMOS: Hijacked session token can be used to reset password for persistence"}