CVE-2026-77394

creationtimestamp| type| source ---|---|--- 2026-09-23 22:35:31+00:00| published-proof-of-concept| https://github.com/OpenC3/cosmos/security/advisories/GHSA-gvf2-2rh5-mpgf...

GHSA-GVF2-2RH5-MPGF OpenC3 COSMOS: Stored, cross-user XSS via Telemetry screen BUTTON widget

Summary A user who can save a telemetry screen permission systemset can embed JavaScript in a screen BUTTON widget. The BUTTON widget evals the stored button text in the browser when the button is activated, and screens are shared content rendered to other users in the scope. As a result, an...

OpenC3 COSMOS: Stored, cross-user XSS via Telemetry screen BUTTON widget

Summary A user who can save a telemetry screen permission systemset can embed JavaScript in a screen BUTTON widget. The BUTTON widget evals the stored button text in the browser when the button is activated, and screens are shared content rendered to other users in the scope. As a result, an...

CVE-2026-77601

creationtimestamp| type| source ---|---|--- 2026-09-23 20:35:11+00:00| published-proof-of-concept| https://github.com/OpenC3/cosmos/security/advisories/GHSA-vp3w-52v9-q57f...

CVE-2026-77602

creationtimestamp| type| source ---|---|--- 2026-09-23 20:08:06+00:00| seen| https://bsky.app/profile/stemshop.bsky.social/post/3mw7k7d42lb2r 2026-09-23 20:35:09+00:00| published-proof-of-concept| https://github.com/OpenC3/cosmos/security/advisories/GHSA-jjq7-m736-w977 2026-09-24 00:50:05+00:00|...

CVE-2026-77601

OpenC3 COSMOS provides the functionality needed to send commands to and receive data from one or more embedded systems. From 5.12.0 until 7.3.0, an authenticated actor can write the pypiurl setting through setsetting at POST /openc3-api/api, then cause OpenC3::PluginModel.installphase2 in...

CVE-2026-77602

OpenC3 COSMOS provides the functionality needed to send commands to and receive data from one or more embedded systems. From 5.1.0 until 7.3.0, authenticated non-administrator users can write content under targetsmodified/ that is later executed by multiple configuration paths below the intended...

CVE-2026-77394

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 systemset permission can store a shared screen through POST /openc3-api/screen whose BUTTON widget action is evaluated by...

GHSA-JJQ7-M736-W977 OpenC3 COSMOS: Authenticated remote code execution via the user-writable config overlay (table definitions, cmd/tlm definitions, and script suites)

Summary COSMOS reads configuration from a user-writable overlay targetsmodified/ before the read-only plugin-installed targets/ tree, and the config subsystem executes code on those files: ConfigParser renders every file as ERB by default, a GENERICREADCONVERSION / GENERICWRITECONVERSION block is...

OpenC3 COSMOS: Authenticated remote code execution via the user-writable config overlay (table definitions, cmd/tlm definitions, and script suites)

Summary COSMOS reads configuration from a user-writable overlay targetsmodified/ before the read-only plugin-installed targets/ tree, and the config subsystem executes code on those files: ConfigParser renders every file as ERB by default, a GENERICREADCONVERSION / GENERICWRITECONVERSION block is...

EUVD-2026-85566

OpenC3 COSMOS provides the functionality needed to send commands to and receive data from one or more embedded systems. From 5.1.0 until 7.3.0, authenticated non-administrator users can write content under targetsmodified/ that is later executed by multiple configuration paths below the intended...

CVE-2026-77602 OpenC3 COSMOS: Authenticated remote code execution via the user-writable config overlay (table definitions, cmd/tlm definitions, and script suites)

OpenC3 COSMOS provides the functionality needed to send commands to and receive data from one or more embedded systems. From 5.1.0 until 7.3.0, authenticated non-administrator users can write content under targetsmodified/ that is later executed by multiple configuration paths below the intended...

CVE-2026-77602 OpenC3 COSMOS: Authenticated remote code execution via the user-writable config overlay (table definitions, cmd/tlm definitions, and script suites)

OpenC3 COSMOS provides the functionality needed to send commands to and receive data from one or more embedded systems. From 5.1.0 until 7.3.0, authenticated non-administrator users can write content under targetsmodified/ that is later executed by multiple configuration paths below the intended...

CVE-2026-77602 OpenC3 COSMOS: Authenticated remote code execution via the user-writable config overlay (table definitions, cmd/tlm definitions, and script suites)

OpenC3 COSMOS provides the functionality needed to send commands to and receive data from one or more embedded systems. From 5.1.0 until 7.3.0, authenticated non-administrator users can write content under targetsmodified/ that is later executed by multiple configuration paths below the intended...

CVE-2026-77602

OpenC3 COSMOS versions 5.1.0 through 7.3.0 are vulnerable to authenticated remote code execution (RCE) . The root cause is that the system processes a user-writable configuration overlay (targets_modified/) before the read-only targets/ tree. Authenticated non-administrator users can use features...

EUVD-2026-85564

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 systemset permission can store a shared screen through POST /openc3-api/screen whose BUTTON widget action is evaluated by...

CVE-2026-77394 OpenC3 COSMOS: Stored, cross-user XSS via Telemetry screen BUTTON widget

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 systemset permission can store a shared screen through POST /openc3-api/screen whose BUTTON widget action is evaluated by...

CVE-2026-77394

OpenC3 COSMOS versions 5.0.6 through 7.3.0 are vulnerable to a stored, cross-user XSS via the Telemetry screen BUTTON widget. An authenticated actor with system_set permissions can store a screen via POST /openc3-api/screen containing a button action. The application fails to sanitize this input,...

CVE-2026-77394 OpenC3 COSMOS: Stored, cross-user XSS via Telemetry screen BUTTON widget

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 systemset permission can store a shared screen through POST /openc3-api/screen whose BUTTON widget action is evaluated by...

CVE-2026-77394 OpenC3 COSMOS: Stored, cross-user XSS via Telemetry screen BUTTON widget

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 systemset permission can store a shared screen through POST /openc3-api/screen whose BUTTON widget action is evaluated by...