CVE-2026-78860 Hardcoded credentials in n/a

High 7.8 Published Updated

A local attacker can execute arbitrary code on Mercusys AC12 V2 routers due to plaintext storage of sensitive information.

Exploited in the wild
Not known
Login needed
Any signed-in user
Attackable
Local or same network only
Victim action needed
Not needed
Fix
None listed

What is CVE-2026-78860?

CVE-2026-78860 is a high-severity vulnerability in n/a, published on 5 Oct 2026. It can only be exploited from the same machine or local network, with no action from the victim.

Official description

An issue in Mercusys AC12 V2 allows a local attacker to execute arbitrary code via the storage of information in plaintext

Weakness: CWE-347, CWE-311

Which versions are affected by CVE-2026-78860?

How do I fix CVE-2026-78860?

No fix has been published for CVE-2026-78860 yet. Limit exposure of the affected software until one is available.

Is CVE-2026-78860 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-78860 exists.

Sources

Also known as GHSA-j47g-wqf7-q7w8.

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