# CVE-2026-121932: Linksys E5350 OS command injection in /wizard/apply.cgi

Source: https://junglewise.ai/threats/cve-2026-121932-a-vulnerability-was-detected-in-linksys-e5350-1-0-00-037-this  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-11-04. Updated: 2026-11-04  
License: CC BY 4.0 with a link back

CVE-2026-121932 · Severity: critical · CVSS 10 · Published 2026-11-04

The Linksys E5350 router is vulnerable to remote command execution during its initial setup phase, before the owner has configured a password. An attacker on the network can manipulate diagnostic parameters to inject arbitrary OS commands that execute as root, allowing them to install malware, steal credentials, or enroll the device in a botnet when it is most exposed.

Vendors: [Linksys](https://junglewise.ai/threats/vendors/linksys).

## Quick answers

**Is CVE-2026-121932 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-121932 being exploited in the wild.

**How severe is CVE-2026-121932?** Critical severity, with a CVSS score of 10, published 4 November 2026.

**Which products and versions are affected?** Linksys E5350 1.0.00.037.

**Is there a fix for CVE-2026-121932?** No fixed version is recorded yet. Complete the router setup wizard immediately after initial boot to set a password and enable authentication on configuration endpoints. If the device is deployed in an ISP-provisioned or managed state, ensure it is isolated from untrusted networks during the setup phase.</anigation>
</invoke> If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.

**How is CVE-2026-121932 attacked?** It is attacked over the network, in a network appliance.

**Am I affected by CVE-2026-121932?** Check whether you run Linksys E5350 at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## How to fix


Complete the router setup wizard immediately after initial boot to set a password and enable authentication on configuration endpoints. If the device is deployed in an ISP-provisioned or managed state, ensure it is isolated from untrusted networks during the setup phase.</anigation>
</invoke>

## Technical details

The vulnerability chains missing authentication (CWE-306) with OS command injection (CWE-78) in the /wizard/apply.cgi endpoint. While the router is in factory or post-reset state (wizard_finish flag unset), the endpoint is served without authentication and dispatches the same action handlers as the authenticated /apply.cgi, including Diagnostics functions that execute ping_ip and traceroute_ip parameters unsanitized via system() calls. The injected shell metacharacters (;, $, (, etc.) bypass a weak blacklist that only blocks space, pipe, and redirect operators.

## Affected products

- Linksys E5350 1.0.00.037

## Timeline

- 2026-11-04: disclosed
- 2026-11-04: exploited: exploit is public

## References

- [https://github.com/Zimo-666/E5350-cves/tree/main/01-wizard-preauth-command-injection](https://github.com/Zimo-666/E5350-cves/tree/main/01-wizard-preauth-command-injection)
- [https://vuldb.com/cve/CVE-2026-121932](https://vuldb.com/cve/CVE-2026-121932)

## Related threats

- [Linksys E5350 authentication bypass in Setup Wizard](https://junglewise.ai/threats/cve-2026-121933-a-flaw-has-been-found-in-linksys-e5350-1-0-00-037-this-impacts)