CVE-2026-63248Network attack vector

Cross-session diagnostics disclosure via missing role checks

Published Aug 4, 2026 · Updated Aug 4, 2026

Missing authorization in Eclipse Milo 0.6.0 through 1.1.4 allows remote attackers to access OPC UA server security diagnostics. Session security diagnostics nodes and the diagnostics-enabled flag apply access restrictions but omit role-permission checks, so any session can enable diagnostics and read other sessions' security data. Anonymous access can enable diagnostics over a None/None endpoint, while cross-session reads require a trusted client certificate over SignAndEncrypt and expose usernames, login history, authentication methods, policies, modes, and public certificates.

CVSS severity6.9
Medium
EPSS probability0.16%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Missing authorization in Eclipse Milo 0.6.0 through 1.1.4 allows remote attackers to access OPC UA server security diagnostics. Session security diagnostics nodes and the diagnostics-enabled flag apply access restrictions but omit role-permission checks, so any session can enable diagnostics and read other sessions' security data. Anonymous access can enable diagnostics over a None/None endpoint, while cross-session reads require a trusted client certificate over SignAndEncrypt and expose usernames, login history, authentication methods, policies, modes, and public certificates.

The record

CVE
CVE-2026-63248
Published
Aug 4, 2026
Updated
Aug 4, 2026
Vendor
The Eclipse Foundation
Product
Eclipse Milo
Classifications
CWE-862
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 4, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 4, 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.

  1. Affected versionversion=0.6.0 <=1.1.4

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

The Eclipse Foundation · Eclipse Miloversion=0.6.0 <=1.1.4

Published CVSS scores

6.5NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N
6.9Eclipse FoundationCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N

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.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-862Missing Authorization

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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