CVE-2026-63248 Missing authorization in Eclipse Milo
An anonymous attacker can read sensitive security diagnostics and session data from Eclipse Milo OPC UA servers due to missing access authorization checks.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-63248?
CVE-2026-63248 is a medium-severity missing authorization vulnerability in Eclipse Milo, published on 4 Aug 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official 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.
Weakness: CWE-862
Which versions are affected by CVE-2026-63248?
It affects 1 product.
Products include Eclipse Milo.
How do I fix CVE-2026-63248?
No fix has been published for CVE-2026-63248 yet. Limit exposure of the affected software until one is available.
Upgrade, and check permissions on every request on the server, not only in the interface. More about Missing authorization.
Is CVE-2026-63248 being exploited?
There is no known exploitation of CVE-2026-63248 in the wild and no public exploit code.
Other vulnerabilities in Eclipse Milo
Sources
Also known as GHSA-xg6h-qgc7-qqr7.