CVE-2026-59804

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.

CVSS v3 6.8 MEDIUM

6.8^/10

CVSS v3 : MEDIUM

Vector :

Exploitability : 1.6 / Impact : 5.2

Attack Vector NETWORK

Attack Complexity HIGH

Privileges Required NONE

User Interaction REQUIRED

Confidentiality Impact HIGH

Integrity Impact HIGH

Availability Impact NONE

Scope UNCHANGED

References

Link	Resource
https://github.com/web-infra-dev/midscene/commit/86f4118d1d847041c63d79e347e08c87c3f1a882
https://github.com/web-infra-dev/midscene/issues/2752
https://github.com/web-infra-dev/midscene/pull/2759
https://www.vulncheck.com/advisories/midscene-bridge-server-session-hijack-via-unauthenticated-websocket

Configurations

No configuration.

History

08 Jul 2026, 20:16

Type	Values Removed	Values Added
New CVE

Information

Published : 2026-07-08 20:16

Updated : 2026-07-10 17:56

NVD link : CVE-2026-59804

Mitre link : CVE-2026-59804

CVE.ORG link : CVE-2026-59804

JSON object : View

Products Affected

No product.

CWE

CWE-306

Missing Authentication for Critical Function

CWE-1385

Missing Origin Validation in WebSockets

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