CVE-2026-59804

Description

Midscene Bridge Server through 1.10.3, fixed in commit 86f4118, contains a missing authentication and CORS misconfiguration vulnerability that allows unauthenticated remote attackers to hijack active bridge sessions by opening a cross-origin WebSocket connection to the local Socket.IO server, which performs no Origin header validation and requires no authentication token. Attackers can connect from any web page visited by the victim to seize the single-client slot, intercept and inject automation commands, exfiltrate command-payload data, or unconditionally terminate the server by supplying the MIDSCENE_BRIDGE_SIGNAL_KILL query parameter.

References

https://www.vulncheck.com/advisories/midscene-bridge-server-session-hijack-via-unauthenticated-websocket

https://github.com/web-infra-dev/midscene/pull/2759

https://github.com/web-infra-dev/midscene/issues/2752

https://github.com/web-infra-dev/midscene/commit/86f4118d1d847041c63d79e347e08c87c3f1a882

Details

Source: Mitre, NVD

Risk Information

CVSS v2

CVSS v3

CVSS v4