CVE-2026-46416: CWE-284: Improper Access Control in microsoft UFO
Microsoft UFO open-source framework for intelligent automation across devices and platforms. In 3.0.1-4-ge2626659, Microsoft UFO creates one shared UFOWebSocketHandler instance and reuses it for multiple authenticated WebSocket connections. The handler stores per-connection protocol objects in mutable instance fields. Each new WebSocket connection overwrites those fields. Later, message handlers send responses through the shared fields instead of through protocol objects bound to the originating connection. As a result, the most recently connected authenticated client can receive protocol responses that belong to another authenticated client.
AI Analysis
Technical Summary
Microsoft UFO, an open-source framework for intelligent automation, improperly manages WebSocket connections by reusing a single UFOWebSocketHandler instance across multiple authenticated clients. Mutable instance fields holding per-connection protocol objects are overwritten when new connections are established, leading to cross-connection data leakage where one client may receive responses meant for another. This is classified under CWE-284 (Improper Access Control) and CWE-488 (Exposure of Internal Implementation). The affected version is 3.0.1-4-ge2626659. The vulnerability is publicly known but lacks an official fix or patch at this time.
Potential Impact
The vulnerability can lead to unauthorized disclosure of protocol responses between authenticated clients, potentially exposing sensitive information across sessions. This compromises confidentiality and integrity to a limited extent, as indicated by the CVSS vector (Confidentiality: Low, Integrity: Low, Availability: Low). There is no evidence of active exploitation in the wild.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until an official fix is released, users should consider limiting the use of affected versions or isolating WebSocket connections to prevent cross-client data leakage. Monitor official Microsoft UFO repositories and advisories for updates.
CVE-2026-46416: CWE-284: Improper Access Control in microsoft UFO
Description
Microsoft UFO open-source framework for intelligent automation across devices and platforms. In 3.0.1-4-ge2626659, Microsoft UFO creates one shared UFOWebSocketHandler instance and reuses it for multiple authenticated WebSocket connections. The handler stores per-connection protocol objects in mutable instance fields. Each new WebSocket connection overwrites those fields. Later, message handlers send responses through the shared fields instead of through protocol objects bound to the originating connection. As a result, the most recently connected authenticated client can receive protocol responses that belong to another authenticated client.
CVSS v3.1
Score 6.3medium
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
Microsoft UFO, an open-source framework for intelligent automation, improperly manages WebSocket connections by reusing a single UFOWebSocketHandler instance across multiple authenticated clients. Mutable instance fields holding per-connection protocol objects are overwritten when new connections are established, leading to cross-connection data leakage where one client may receive responses meant for another. This is classified under CWE-284 (Improper Access Control) and CWE-488 (Exposure of Internal Implementation). The affected version is 3.0.1-4-ge2626659. The vulnerability is publicly known but lacks an official fix or patch at this time.
Potential Impact
The vulnerability can lead to unauthorized disclosure of protocol responses between authenticated clients, potentially exposing sensitive information across sessions. This compromises confidentiality and integrity to a limited extent, as indicated by the CVSS vector (Confidentiality: Low, Integrity: Low, Availability: Low). There is no evidence of active exploitation in the wild.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until an official fix is released, users should consider limiting the use of affected versions or isolating WebSocket connections to prevent cross-client data leakage. Monitor official Microsoft UFO repositories and advisories for updates.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- GitHub_M
- Date Reserved
- 2026-05-13T21:04:10.933Z
- Cvss Version
- 3.1
- State
- PUBLISHED
- Remediation Level
- null
Threat ID: 6a176dbbe29bf47b50f73d83
Added to database: 05/27/2026, 22:18:35 UTC
Last enriched: 05/27/2026, 22:34:23 UTC
Last updated: 07/31/2026, 19:22:59 UTC
Views: 80
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