# CVE-2026-4769: Unauthenticated Access to Internal Diagnostic Interface

> Unauthenticated attackers can access internal diagnostics during boot, leading to full system compromise on WAGO I/O devices.

- **Severity:** Critical 9.3 (`CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/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:** 13 Jul 2026
- **Updated:** 13 Jul 2026
- **Also known as:** GHSA-2r6r-vgg5-p59v

## What is CVE-2026-4769?

CVE-2026-4769 is a critical authentication bypass vulnerability in WAGO 0765-110x/0100-0000, published on 13 Jul 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

Certain devices in the WAGO System I/O Field series activate an internal diagnostic capability during the initial startup sequence. This functionality is not formally documented and becomes accessible without authentication for a brief period in the early boot phase. During this window, an unauthenticated remote attacker can gain access to the internal system processes, resulting in full system compromise.

Weakness: CWE-912 (Hidden Functionality)

## Which versions are affected by CVE-2026-4769?


## How do I fix CVE-2026-4769?

No fix has been published for CVE-2026-4769 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-4769 being exploited?

There is no known exploitation of CVE-2026-4769 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-4769 and fix it if it is affected.

What it is: CVE-2026-4769 is a critical authentication bypass vulnerability in WAGO 0765-110x/0100-0000, published on 13 Jul 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-2026-4769 in the wild and no public exploit code.

Affected product: WAGO 0765-110x/0100-0000. 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-2026-4769/ (Markdown: https://insights.sbomify.com/CVE-2026-4769/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-4769
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-4769
- OSV: https://osv.dev/vulnerability/CVE-2026-4769

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-4769/
Summaries are generated and may contain mistakes; the official description above is the record.