Authenticated stale result disclosure via session ID reuse
Published May 27, 2026 · Updated May 27, 2026
Authorization bypass in Microsoft UFO 3.0.1-4-ge2626659 allows remote authenticated users to read prior task results via WebSocket messages. UFOWebSocketHandler accepts a client-supplied session_id, and SessionManager returns an existing completed session without checking ownership, causing send_task_end() to deliver its stored results to the new requester. Exploitation requires a valid shared server token and knowledge or prediction of a session identifier that remains in the shared in-memory store.
Summary
What happened
Authorization bypass in Microsoft UFO 3.0.1-4-ge2626659 allows remote authenticated users to read prior task results via WebSocket messages. UFOWebSocketHandler accepts a client-supplied session_id, and SessionManager returns an existing completed session without checking ownership, causing send_task_end() to deliver its stored results to the new requester. Exploitation requires a valid shared server token and knowledge or prediction of a session identifier that remains in the shared in-memory store.
The record
- CVE
- CVE-2026-46544
- Published
- May 27, 2026
- Updated
- May 27, 2026
- Vendor
- Microsoft
- Product
- UFO
- Classifications
- CWE-639, T1213
- Attack vector
- network
- Privileges
- authenticated
Timeline
How it unfolded
- May 27, 2026CVE publishedPublication date reported by the CVE source.
- May 27, 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=3.0.1-4-ge2626659
What conditions does exploitation require?
What is affected?
Published CVSS scores
CVSS describes severity. EPSS estimates exploitation probability.
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
- UFO session ID reuse 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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