Auth bypass in Eclipse Milo
CVE-2026-58080
In Eclipse Milo versions 1.0.0 through 1.1.4, `OpcUaServerConfig.copy()` fails to preserve a configured `RoleMapper`. On servers that rely on role permissions and construct the running configuration through `copy()`, sessions receive no role IDs and the default access controller skips role-permission checks, allowing an anonymous client where anonymous sessions are permitted to read role-permission metadata, invoke protected methods, or delete protected nodes.
Vulnerability class: Broken Access Control
Published · last modified .
CVSS v3 metric
CVSS v3 base score 8.2 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:H/A:N.
EPSS exploit prediction
EPSS: 0.004 (31.8th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 32nd percentile — 31.8% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.004 · newest: 0.004 · change: 0.000
Affected products
- Eclipse Milo
- Eclipse Foundation Milo — versions 1.0.0
Weakness classification (CWE)
References
- github.com/eclipse-milo/milo/commit/d51f03e9a75f313ab41c3d68d809f4b922073f1a (Patch)
- gitlab.eclipse.org/security/vulnerability-reports/-/work_items/598 (Issue Tracking, Vendor Advisory)
- gitlab.eclipse.org/security/cve-assignment/-/work_items/180 (Patch, Issue Tracking, Vendor Advisory)
Frequently asked questions
- What is CVE-2026-58080?
- CVE-2026-58080 is a high-severity vulnerability in Eclipse Milo, classified under Missing Authorization. CVSS score: 8.2/10. Published 2026-08-04.
- How severe is CVE-2026-58080?
- High severity. CVSS v3 base score is 8.2 out of 10.