CVE-2026-59804
Midscene Bridge Server - Session Hijack via Unauthenticated WebSocket
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.
INFO
Published Date :
July 8, 2026, 8:16 p.m.
Last Modified :
Oct. 25, 2026, 5:10 p.m.
Remotely Exploit :
Yes !
Source :
[email protected]
Affected Products
The following products are affected by CVE-2026-59804
vulnerability.
Even if cvefeed.io is aware of the exact versions of the
products
that
are
affected, the information is not represented in the table below.
No affected product recoded yet
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS | 134c704f-9b21-4f2e-91b3-4a467353bcc0 | |||||
| CVSS 3.1 | MEDIUM | 83251b91-4cc7-4094-a5c7-464a1b83ea10 | ||||
| CVSS 3.1 | MEDIUM | [email protected] | ||||
| CVSS 4.0 | HIGH | 83251b91-4cc7-4094-a5c7-464a1b83ea10 | ||||
| CVSS 4.0 | HIGH | [email protected] |
Solution
- Update Midscene Bridge Server past version 1.10.3.
- Ensure Origin header validation is enforced.
- Implement proper authentication for WebSocket connections.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-59804.
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-59804 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-59804
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-59804 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-59804 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
CVE Translated by [email protected]
Oct. 25, 2026
Action Type Old Value New Value Added Translation Title: midscene de web-infra-dev, Description: Midscene Bridge Server hasta la versión 1.10.3, corregido en el commit 86f4118, contiene una vulnerabilidad de falta de autenticación y mala configuración de CORS que permite a atacantes remotos no autenticados secuestrar sesiones de puente activas abriendo una conexión WebSocket de origen cruzado al servidor Socket.IO local, que no realiza validación del encabezado Origin y no requiere ningún token de autenticación. Los atacantes pueden conectarse desde cualquier página web visitada por la víctima para apoderarse del slot de un solo cliente, interceptar e inyectar comandos de automatización, exfiltrar datos de carga útil de comandos o terminar incondicionalmente el servidor suministrando el parámetro de consulta MIDSCENE_BRIDGE_SIGNAL_KILL. -
CVE Modified by [email protected]
Oct. 08, 2026
Action Type Old Value New Value Added Affected Affected value modified. <a href="https://github.com/CVEProject/cvelistV5/blob/main/cves/2026/59xxx/CVE-2026-59804.json">CVE-2026-59804</a> Added Reference https://github.com/web-infra-dev/midscene/commit/86f4118d1d847041c63d79e347e08c87c3f1a882 Added Reference https://github.com/web-infra-dev/midscene/issues/2752 Added Reference https://github.com/web-infra-dev/midscene/pull/2759 Added Reference https://www.vulncheck.com/advisories/midscene-bridge-server-session-hijack-via-unauthenticated-websocket Removed Reference https://github.com/web-infra-dev/midscene/commit/86f4118d1d847041c63d79e347e08c87c3f1a882 Removed Reference https://github.com/web-infra-dev/midscene/issues/2752 Removed Reference https://github.com/web-infra-dev/midscene/pull/2759 Removed Reference https://www.vulncheck.com/advisories/midscene-bridge-server-session-hijack-via-unauthenticated-websocket -
CVE Modified by 134c704f-9b21-4f2e-91b3-4a467353bcc0
Jul. 09, 2026
Action Type Old Value New Value Added SSVC {'id': 'CVE-2026-59804', 'role': 'CISA Coordinator', 'options': [{'exploitation': 'poc'}, {'automatable': 'no'}, {'technicalImpact': 'total'}], 'version': '2.0.3', 'timestamp': '2026-07-09T14:02:32.806757Z'} -
New CVE Received by [email protected]
Jul. 08, 2026
Action Type Old Value New Value Added Affected [{'repo': 'https://github.com/web-infra-dev/midscene', 'vendor': 'web-infra-dev', 'product': 'midscene', 'versions': [{'status': 'affected', 'version': '0', 'versionType': 'semver', 'lessThanOrEqual': '1.10.3'}, {'status': 'unaffected', 'version': '86f4118d1d847041c63d79e347e08c87c3f1a882', 'versionType': 'git'}], 'packageURL': 'pkg:npm/midscene', 'defaultStatus': 'unaffected'}] Added 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. Added CVSS V4.0 AV:N/AC:H/AT:N/PR:N/UI:P/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X Added CVSS V3.1 AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:N Added CWE CWE-306 Added CWE CWE-1385 Added Reference https://github.com/web-infra-dev/midscene/commit/86f4118d1d847041c63d79e347e08c87c3f1a882 Added Reference https://github.com/web-infra-dev/midscene/issues/2752 Added Reference https://github.com/web-infra-dev/midscene/pull/2759 Added Reference https://www.vulncheck.com/advisories/midscene-bridge-server-session-hijack-via-unauthenticated-websocket