[Eclipse Milo] CVE Reservation Request: Cross-session security diagnostics disclosure
# CVE Reservation Request
## CVE record information
**Project name:** Eclipse Milo
**Project id:** iot.milo
**Versions affected:** v0.6.0 through v1.1.4
**Common Weakness Enumeration (CWE):**
- [CWE-862: Missing Authorization](https://cwe.mitre.org/data/definitions/862.html)
**Common Attack Pattern Enumerations and Classifications (CAPEC):**
- [CAPEC-1: Accessing Functionality Not Properly Constrained by ACLs](https://capec.mitre.org/data/definitions/1.html)
**Common Vulnerability Scoring System:** [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 (6.9 Medium)](https://www.first.org/cvss/calculator/4.0#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)
**Summary:** 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.
**Links:**
- https://github.com/eclipse-milo/milo/commit/a5dae1be0657d2b4fcb66e63f377c1dc36069e2a
- https://gitlab.eclipse.org/security/vulnerability-reports/-/work_items/598
**Credits:** Abhinav Agarwal (GitHub: @abhinavagarwal07)
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