CVE-2026-77394
highOpenC3 COSMOS provides the functionality needed to send commands to and receive data from one or more embedded systems.
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's 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's bearer token, account takeover, and actions with the victim's 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.
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:L/A:N Affected products
Not reported by the source (unknown — not "none").
Weakness classification (CWE)
Source: NVD / CISA. “NVD-CWE-Other” and “NVD-CWE-noinfo” mean NVD could not assign a specific weakness.
Mitigation & advisories
No vendor advisory or patch reference tagged by NVD. Check the references below.
References
- https://github.com/OpenC3/cosmos/commit/10371f8f410b9ad588f98dfa3befaaacb6587cd3 security-advisories@github.com
- https://github.com/OpenC3/cosmos/pull/3560 security-advisories@github.com
- https://github.com/OpenC3/cosmos/releases/tag/v7.3.0 security-advisories@github.com
- https://github.com/OpenC3/cosmos/security/advisories/GHSA-gvf2-2rh5-mpgf security-advisories@github.com
- https://github.com/OpenC3/cosmos/security/advisories/GHSA-gvf2-2rh5-mpgf 134c704f-9b21-4f2e-91b3-4a467353bcc0