web-infra-dev Midscene Bridge Server up to 1.10.3 WebSocket Server MIDSCENE_BRIDGE_SIGNAL_KILL missing authentication

Summaryinfo

A vulnerability was found in web-infra-dev Midscene Bridge Server up to 1.10.3. It has been rated as critical. Affected by this issue is some unknown functionality of the component WebSocket Server. Performing a manipulation of the argument MIDSCENE_BRIDGE_SIGNAL_KILL results in missing authentication. This vulnerability is identified as CVE-2026-59804. The attack can be initiated remotely. There is not any exploit available.

Detailsinfo

A vulnerability was found in web-infra-dev Midscene Bridge Server up to 1.10.3. It has been classified as critical. This affects an unknown function of the component WebSocket Server. The manipulation of the argument MIDSCENE_BRIDGE_SIGNAL_KILL with an unknown input leads to a missing authentication vulnerability. CWE is classifying the issue as CWE-306. The product does not perform any authentication for functionality that requires a provable user identity or consumes a significant amount of resources. This is going to have an impact on confidentiality, integrity, and availability. The summary by CVE is:

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.

It is possible to read the advisory at github.com. This vulnerability is uniquely identified as CVE-2026-59804 since 07/07/2026. The exploitability is told to be easy. It is possible to initiate the attack remotely. No form of authentication is needed for exploitation. It demands that the victim is doing some kind of user interaction. Technical details of the vulnerability are known, but there is no available exploit. The pricing for an exploit might be around USD $0-$5k at the moment (estimation calculated on 07/08/2026).

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

Productinfo

Vendor

• web-infra-dev

Name

• Midscene Bridge Server

Version

• 1.10.0
• 1.10.1
• 1.10.2
• 1.10.3

CPE 2.3info

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CPE 2.2info

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