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.
- 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-2026-4769?
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
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.
Upgrade, and rotate credentials and sessions that may have been exposed. More about Authentication bypass.
Is CVE-2026-4769 being exploited?
There is no known exploitation of CVE-2026-4769 in the wild and no public exploit code.
Sources
Also known as GHSA-2r6r-vgg5-p59v.