CVE-2026-59804 | Midscene Bridge Server through 1.10.3, fixed in commit 86f41… | CVSS 6.8 MEDIUM

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.

Metadata

CVE ID: CVE-2026-59804
State: PUBLISHED
Assigner: VulnCheck
Reserved: 2026-07-07 14:39 UTC
Published: 2026-07-08 19:42 UTC
Last updated: 2026-07-09 14:02 UTC
Primary CWE: CWE-1385
Missing Origin Validation in WebSockets
Vendor / Product: web-infra-dev / midscene
Sources: cve.org · NVD

Severity & Metrics

6.8 MEDIUM CVSS 3.1

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

SSVC — CISA Coordinator

Exploitation: PoC
Automatable: no
Tech. Impact: total

Affected products (1)

Vendor	Product	Platform	Versions
web-infra-dev	midscene	—	0 ≤ 1.10.3, 86f4118d1d847041c63d79e347e08c87c3f1a882

Weakness (CWE)

CWE	Source	Description
CWE-1385	cna	Missing Origin Validation in WebSockets
CWE-306	cna	Missing Authentication for Critical Function

CVSS scores (2)

Score	Severity	Version	Source	Vector
7.6	HIGH	4.0	cna	CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:P/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N
6.8	MEDIUM	3.1	cna	CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:N

References (4)