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CVE-2026-77394— OpenC3 COSMOS 遥测按钮存储型跨用户XSS漏洞

一分钟漏洞结论

影响对象
OpenC3 cosmos
利用判断
尚无明确在野利用证据，仍需结合暴露面评估
建议动作
优先检查厂商安全公告和参考链接中的修复版本；无法立即升级时，限制受影响服务暴露并加强监测。

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 BU

CVSS 7.6 · High

影响版本矩阵 1

厂商产品 版本范围状态
OpenC3 cosmos >= 5.0.6, < 7.3.0 affected
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一、 漏洞 CVE-2026-77394 基础信息

漏洞信息

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Vulnerability Title
OpenC3 COSMOS: Stored, cross-user XSS via Telemetry screen BUTTON widget
来源: CVE Program / CVE List V5
Vulnerability 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'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.
来源: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:L/A:N
来源: CVE Program / CVE List V5
Vulnerability Type
在Web页面生成时对输入的转义处理不恰当(跨站脚本)
来源: CVE Program / CVE List V5

受影响产品

厂商 产品 影响版本 CPE 订阅
OpenC3 cosmos >= 5.0.6, < 7.3.0 -

二、漏洞 CVE-2026-77394 的公开POC

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三、漏洞 CVE-2026-77394 的情报信息

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CVE-2026-77394 其他参考 (4)

同批安全公告 · OpenC3 · 2026-09-23 · 共 3 条

CVE-2026-77602 9.9 CRITICAL OpenC3 COSMOS 远程代码执行漏洞
CVE-2026-77601 8.8 HIGH OpenC3 COSMOS 命令注入漏洞

IV. Related Vulnerabilities

Same product: cosmos
Same vendor: OpenC3
Same weakness: CWE-79

V. Comments for CVE-2026-77394

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