CVE-2026-46416

MEDIUMNVD 6.36.3—
EchelonGraph scoreMEDIUM confidence

This medium-severity CVE scores 6.3 under NVD CVSS v3. EPSS exploit probability: 0.3%, top 80% of all CVEs by exploit prediction. GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).

Triggered by: NVD CVSS baseline
Sources: epss, nvd
Elevated
6.3
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS: 0%CVSS: 6.3Exploit: NoneExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

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
6.3
EG Score
6.3(medium)
EPSS
19.6%
KEV
Not listed

Published

May 27, 2026

Last Modified

May 28, 2026

Advisory Details (1)

Auto-updated Jun 13, 2026
🔬 Proof of concept available. Patch available. Sources: github.
github Patch Available🟡 PoC Available

UFO shared WebSocket handler state causes cross-client response hijacking · Advisory · microsoft/UFO · GitHub

https://github.com/microsoft/UFO/security/advisories/GHSA-cwwh-p9rv-4pj4

Weakness Classification(2)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 8× in last 7d / 47× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

  1. 2026-07-16 17:03 UTCEPSS rescore
  2. 2026-07-15 16:57 UTCEPSS rescore
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  1. 2026-06-28 04:56 UTCEPSS rescore
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  22. 2026-06-17 13:31 UTCEG score recompute
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  26. 2026-06-15 14:56 UTCEG score recompute
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  28. 2026-06-13 23:00 UTCEPSS rescore
  29. 2026-06-13 19:37 UTCEG score recompute
  30. 2026-06-12 23:12 UTCEPSS rescore
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  32. 2026-06-12 18:49 UTCEG score recompute
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  44. 2026-06-07 15:25 UTCEPSS rescore
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  72. 2026-05-27 22:19 UTCEG score recompute

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Frequently asked(5)

What is CVE-2026-46416?
CVE-2026-46416 is a medium vulnerability published on May 27, 2026. 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…
When was CVE-2026-46416 disclosed?
CVE-2026-46416 was first published in the National Vulnerability Database on May 27, 2026, with the most recent update on May 28, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-46416 actively exploited?
CVE-2026-46416 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 19.6% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2026-46416?
CVE-2026-46416 has a CVSS v3 base score of 6.3 (NVD).
How do I remediate CVE-2026-46416?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-46416, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

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