CVE Catalog

CVE-2026-59804

MediumCVSS 6.8
Published: Updated: Translated: NVD NIST

Exploitation Probability (EPSS)

Low risk
0.31%

23th percentile - higher than 23% of all known CVEs

Summary

Midscene Bridge Server up to version 1.10.3 (fixed in commit 86f4118) suffers from missing authentication and CORS misconfiguration. This 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.

Risk Assessment

Attackers can from any web page visited by the victim 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.

Recommendation

Immediately update the Midscene Bridge Server to a version containing commit 86f4118 and implement authentication and Origin header validation for WebSocket connections.

Related vulnerabilities

Original NVD description (English source)

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.

Vulnerability data from NVD (NIST) · CISA KEV · EPSS