CVE-2026-63248

Missing Authorization on OPC UA Server Diagnostics in Eclipse Milo

Published Aug 4, 2026 CVSS 4.0 · 6.9 Medium EPSS < 1% KEV · Not listed
Description
In Eclipse Milo versions 0.6.0 through 1.1.4, OPC UA server diagnostics nodes do not enforce access authorization. An anonymous client can enable diagnostics over a None/None endpoint without a certificate; with a trusted client application certificate over SignAndEncrypt, it can read security diagnostics for other active sessions, exposing usernames, login history, authentication mechanisms, security modes and policies, and public client certificates.

Remediation

No solution or workaround provided in the CVE record

Tracking

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Advisories

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History
Type Values Removed Values Added
Title Missing Authorization on OPC UA Server Diagnostics in Eclipse Milo
Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Type Values Removed Values Added
First Time appeared Eclipse
Eclipse milo
Vendors & Products Eclipse
Eclipse milo
Type Values Removed Values Added
Description In Eclipse Milo versions 0.6.0 through 1.1.4, OPC UA server diagnostics nodes do not enforce access authorization. An anonymous client can enable diagnostics over a None/None endpoint without a certificate; with a trusted client application certificate over SignAndEncrypt, it can read security diagnostics for other active sessions, exposing usernames, login history, authentication mechanisms, security modes and policies, and public client certificates.
Weaknesses CWE-862
References
Metrics cvssV4_0

{'score': 6.9, 'vector': 'CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N'}

Weaknesses

Sources

Status
PUBLISHED
Assigner
eclipse
Published
Updated
Aug 4, 2026, 3:02 PM
Reserved
Jul 16, 2026, 1:58 PM
Status
Analyzed
Published
Aug 4, 2026, 1:18 PM
Modified
Oct 23, 2026, 11:10 PM