{"id":"EUVD-2026-85564","enisaUuid":"01d2cdbe-340b-3d09-af1f-bd22e75ff6ff","description":"OpenC3 COSMOS provides the functionality needed to send commands to and receive data from one or more embedded systems. From 5.0.6 until 7.3.0, an authenticated actor with system_set permission can store a shared screen through POST /openc3-api/screen whose BUTTON widget action is evaluated by openc3-cosmos-init/plugins/packages/openc3-vue-common/src/widgets/ButtonWidget.vue in another operator\u0027s browser session when the button is activated. The stored script runs in the COSMOS origin and can read localStorage.openc3Token, allowing theft of the victim\u0027s bearer token, account takeover, and actions with the victim\u0027s privileges. The permissive content security policy contributes to execution but is not the primary root cause. This issue is fixed in version 7.3.0.","datePublished":"Sep 23, 2026, 6:53:20 PM","dateUpdated":"Sep 23, 2026, 7:28:31 PM","baseScore":7.6,"baseScoreVersion":"3.1","baseScoreVector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:L/A:N","references":"https://github.com/OpenC3/cosmos/security/advisories/GHSA-gvf2-2rh5-mpgf\nhttps://github.com/OpenC3/cosmos/pull/3560\nhttps://github.com/OpenC3/cosmos/commit/10371f8f410b9ad588f98dfa3befaaacb6587cd3\nhttps://github.com/OpenC3/cosmos/releases/tag/v7.3.0\n","aliases":"CVE-2026-77394\nGHSA-gvf2-2rh5-mpgf\n","assigner":"GitHub_M","epss":0.42,"enisaIdProduct":[{"id":"91532803-7f73-3114-aed8-6b65618a33d0","product":{"name":"cosmos","vendor":{"name":"OpenC3"}},"product_version":"5.0.6, \u003c 7.3.0"}],"enisaIdVendor":[{"id":"cb8b0a4f-a2df-3a3f-9329-14319713c540","vendor":{"name":"OpenC3"}}],"enisaIdVulnerability":[{"id":"94feeb8a-65d5-3b5a-a4d1-4d02d4140246","vulnerability":{"id":"CVE-2026-77394","description":"OpenC3 COSMOS provides the functionality needed to send commands to and receive data from one or more embedded systems. From 5.0.6 until 7.3.0, an authenticated actor with system_set permission can store a shared screen through POST /openc3-api/screen whose BUTTON widget action is evaluated by openc3-cosmos-init/plugins/packages/openc3-vue-common/src/widgets/ButtonWidget.vue in another operator\u0027s browser session when the button is activated. The stored script runs in the COSMOS origin and can read localStorage.openc3Token, allowing theft of the victim\u0027s bearer token, account takeover, and actions with the victim\u0027s privileges. The permissive content security policy contributes to execution but is not the primary root cause. This issue is fixed in version 7.3.0.","datePublished":"Sep 23, 2026, 6:53:20 PM","dateUpdated":"Sep 23, 2026, 7:28:31 PM","status":"PUBLISHED","baseScore":7.6,"baseScoreVersion":"3.1","baseScoreVector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:L/A:N","references":"https://github.com/OpenC3/cosmos/security/advisories/GHSA-gvf2-2rh5-mpgf\nhttps://github.com/OpenC3/cosmos/pull/3560\nhttps://github.com/OpenC3/cosmos/commit/10371f8f410b9ad588f98dfa3befaaacb6587cd3\nhttps://github.com/OpenC3/cosmos/releases/tag/v7.3.0\n","enisa_id":"EUVD-2026-85564\n","assigner":"GitHub_M","epss":0.42,"dataProcessed":"Nov 11, 2026, 7:20:58 AM","vulnerabilityProduct":[{"id":"9b016bda-a0e9-30db-8bfc-33b2bdd8c04c","product":{"name":"cosmos","vendor":{"name":"OpenC3"}},"product_version":"5.0.6, \u003c 7.3.0"}],"vulnerabilityVendor":[{"id":"8be0104a-62a1-3bf2-ad4c-ced11a9b4949","vendor":{"name":"OpenC3"}}]}},{"id":"bccb6962-5494-3311-b961-2231d213e637","vulnerability":{"id":"GHSA-gvf2-2rh5-mpgf","description":"OpenC3 COSMOS: Stored, cross-user XSS via Telemetry screen BUTTON widget","datePublished":"Sep 23, 2026, 9:24:11 PM","dateUpdated":"Sep 23, 2026, 9:24:11 PM","baseScore":0.0,"references":"https://github.com/OpenC3/cosmos/security/advisories/GHSA-gvf2-2rh5-mpgf\nhttps://github.com/OpenC3/cosmos/pull/3560\nhttps://github.com/OpenC3/cosmos/commit/10371f8f410b9ad588f98dfa3befaaacb6587cd3\nhttps://github.com/OpenC3/cosmos\nhttps://github.com/OpenC3/cosmos/releases/tag/v7.3.0\n","enisa_id":"EUVD-2026-85564\n","aliases":"GHSA-gvf2-2rh5-mpgf\nCVE-2026-77394\n","epss":0.0,"dataProcessed":"Nov 9, 2026, 3:53:48 PM","vulnerabilityProduct":[],"vulnerabilityVendor":[]}}],"enisaIdAdvisory":[]}