# 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.

- **Severity:** Medium 6.9 (`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`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 4 Aug 2026
- **Updated:** 4 Aug 2026
- **Also known as:** GHSA-xg6h-qgc7-qqr7

## 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 (Missing Authorization)

## Which versions are affected by CVE-2026-63248?

It affects 1 product.


Products: 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.

## 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

- [CVE-2026-60007](https://insights.sbomify.com/CVE-2026-60007/): Information disclosure in Eclipse Milo (critical 9.1)
- [CVE-2026-58080](https://insights.sbomify.com/CVE-2026-58080/): Missing authorization in Eclipse Milo (high 8.8)
- [CVE-2026-62927](https://insights.sbomify.com/CVE-2026-62927/): Missing authorization in Eclipse Milo (high 8.7)
- [CVE-2026-63252](https://insights.sbomify.com/CVE-2026-63252/): Denial of service in Eclipse Milo (high 8.7)
- [CVE-2026-61387](https://insights.sbomify.com/CVE-2026-61387/): Denial of service in Eclipse Milo (medium 6.9)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-63248 and fix it if it is affected.

What it is: 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.
Exploitation: There is no known exploitation of CVE-2026-63248 in the wild and no public exploit code.

Affected product: Eclipse Milo. No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2026-63248/ (Markdown: https://insights.sbomify.com/CVE-2026-63248/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-63248
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-63248
- OSV: https://osv.dev/vulnerability/CVE-2026-63248

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-63248/
Summaries are generated and may contain mistakes; the official description above is the record.