PT-2026-56541 · Web Infra Dev · Midscene

George Chen · Published 2026-07-08 · Updated 2026-07-08 · CVE-2026-59804

Mitre

CVSS v3.1

6.8

Medium

Base vector

AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:N

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.

Exploit

Fix

Missing Authentication

Weakness Enumeration

CWE-306

CWE-1385

Related Identifiers

CVE-2026-59804

Affected Products

Midscene

References · 5

• 🔥 https://github.com/web-infra-dev/midscene/issues/2752 · Exploit
• https://github.com/web-infra-dev/midscene/commit/86f4118d1d847041c63d79e347e08c87c3f1a882 · Patch
• https://nvd.nist.gov/vuln/detail/CVE-2026-59804 · Security Note
• https://github.com/web-infra-dev/midscene/pull/2759 · Note
• https://vulncheck.com/advisories/midscene-bridge-server-session-hijack-via-unauthenticated-websocket · Note