Session hijack via unauthenticated cross-origin WebSocket
Published Jul 8, 2026 · Updated Jul 8, 2026
Missing WebSocket access controls in Web Infra Midscene.js 1.10.3 and earlier allow remote attackers to hijack active bridge sessions. The Socket.IO middleware in io-server.ts accepts browser connections without validating the Origin header or requiring an authentication token, and the kill-signal branch trusts the MIDSCENE_BRIDGE_SIGNAL_KILL query parameter unconditionally. A victim must visit attacker-controlled JavaScript while bridge mode is running; the page can seize an open client slot, read or inject automation payloads, or shut down the bridge server.
Summary
What happened
Missing WebSocket access controls in Web Infra Midscene.js 1.10.3 and earlier allow remote attackers to hijack active bridge sessions. The Socket.IO middleware in io-server.ts accepts browser connections without validating the Origin header or requiring an authentication token, and the kill-signal branch trusts the MIDSCENE_BRIDGE_SIGNAL_KILL query parameter unconditionally. A victim must visit attacker-controlled JavaScript while bridge mode is running; the page can seize an open client slot, read or inject automation payloads, or shut down the bridge server.
The record
- CVE
- CVE-2026-59804
- Published
- Jul 8, 2026
- Updated
- Jul 8, 2026
- Vendor
- Web Infra
- Product
- Midscene.js
- Classifications
- CWE-1385, CWE-306, T1203
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Jul 8, 2026CVE publishedPublication date reported by the CVE source.
- Jul 8, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=0 <=1.10.3
What conditions does exploitation require?
What is affected?
Attacks
What attackers are doing with it
Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.
Weakness, pattern, technique
Public exploit references
- Cross-origin Bridge Server WebSocket proof of conceptproof of concept · demonstrated
Labels summarize the accepted research assessment. They do not indicate a test against your environment.
Technologies
Your stack
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Your stack
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