# CVE-2026-89010: WAVLINK WN535M1/WN535M3 Unauthenticated OS Command Injection via sync_server

> Remote attackers can execute arbitrary root commands on WAVLINK routers via unauthenticated OS command injection in the sync_server daemon.

- **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:** 11 Sep 2026
- **Updated:** 29 Oct 2026
- **Also known as:** GHSA-22gq-jjvp-2jc9

## What is CVE-2026-89010?

CVE-2026-89010 is a critical command injection vulnerability in WAVLINK Technology WN535M1, published on 11 Sep 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

WAVLINK WN535M1 and WN535M3 routers running firmware prior to M35M1_V250922 contain an unauthenticated OS command injection vulnerability that allows remote attackers to execute arbitrary commands as root by sending crafted filenames to the sync_server daemon on TCP port 13136. The daemon interpolates attacker-controlled filename input containing shell metacharacters into a shell command string via sprintf() and passes it to system() without sanitization, enabling root-level command execution on the device.

Weakness: CWE-78 (Improper Neutralization of Special Elements used in an OS Command)

## Which versions are affected by CVE-2026-89010?


## How do I fix CVE-2026-89010?

No fix has been published for CVE-2026-89010 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-89010 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-89010 exists.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-89010 and fix it if it is affected.

What it is: CVE-2026-89010 is a critical command injection vulnerability in WAVLINK Technology WN535M1, published on 11 Sep 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Exploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-89010 exists.

Affected product: WAVLINK Technology WN535M1. 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-2026-89010/ (Markdown: https://insights.sbomify.com/CVE-2026-89010/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-89010
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-89010
- OSV: https://osv.dev/vulnerability/CVE-2026-89010

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From sbomify Insights: https://insights.sbomify.com/CVE-2026-89010/
Summaries are generated and may contain mistakes; the official description above is the record.