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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.

PUBLISHED Reserved 2026-07-07 | Published 2026-07-08 | Updated 2026-07-09 | Assigner VulnCheck




HIGH: 7.6CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:P/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N

MEDIUM: 6.8CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:N

Problem types

Missing Origin Validation in WebSockets

Missing Authentication for Critical Function

Product status

Default status
unaffected

Any version
affected

86f4118d1d847041c63d79e347e08c87c3f1a882 (git)
unaffected

Credits

George Chen finder

References

github.com/web-infra-dev/midscene/issues/2752 (Researcher Disclosure) technical-description exploit

github.com/web-infra-dev/midscene/pull/2759 (Fix PR) issue-tracking

github.com/...ommit/86f4118d1d847041c63d79e347e08c87c3f1a882 (Fix Commit) patch

www.vulncheck.com/...on-hijack-via-unauthenticated-websocket third-party-advisory

cve.org (CVE-2026-59804)

nvd.nist.gov (CVE-2026-59804)

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