# CVE-2026-78860: Hardcoded credentials in n/a

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

- **Severity:** High 7.8 (`CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H`)
- **Exploited in the wild:** Not known
- **Login needed:** Any signed-in user
- **Attackable:** Local or same network only
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 5 Oct 2026
- **Updated:** 6 Oct 2026
- **Also known as:** GHSA-j47g-wqf7-q7w8

## 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 (Improper Verification of Cryptographic Signature), CWE-311 (Missing Encryption of Sensitive Data)

## 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.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-78860 and fix it if it is affected.

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

Affected product: n/a. 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-2026-78860/ (Markdown: https://insights.sbomify.com/CVE-2026-78860/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-78860
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-78860
- OSV: https://osv.dev/vulnerability/CVE-2026-78860

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-78860/
Summaries are generated and may contain mistakes; the official description above is the record.