WAVLINK WN535M1/WN535M3 up to M35M1_V210223 sync_server system filenames os command injection

Summaryinfo

A vulnerability identified as very critical has been detected in WAVLINK WN535M1 and WN535M3 up to M35M1_V210223. The impacted element is the function system of the component sync_server. Performing a manipulation of the argument filenames results in os command injection. This vulnerability only affects products that are no longer supported by the maintainer. This vulnerability was named CVE-2026-89010. The attack may be initiated remotely. There is no available exploit. You should upgrade the affected component.

Detailsinfo

A vulnerability classified as very critical has been found in WAVLINK WN535M1 and WN535M3 up to M35M1_V210223. This affects the function system of the component sync_server. The manipulation of the argument filenames with an unknown input leads to a os command injection vulnerability. CWE is classifying the issue as CWE-78. The product constructs all or part of an OS command using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the intended OS command when it is sent to a downstream component. This is going to have an impact on confidentiality, integrity, and availability. The summary by CVE is:

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.

The advisory is shared at github.com. This vulnerability is uniquely identified as CVE-2026-89010 since 09/10/2026. The exploitability is told to be easy. It is possible to initiate the attack remotely. No form of authentication is needed for exploitation. Technical details are known, but no exploit is available. The price for an exploit might be around USD $0-$5k at the moment (estimation calculated on 09/11/2026). MITRE ATT&CK project uses the attack technique T1202 for this issue.

Upgrading to version M35M1_V250922 eliminates this vulnerability.

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Productinfo

Vendor

• WAVLINK

Name

• WN535M1
• WN535M3

Version

• M35M1_V210223

License

• commercial

Support

• end of life

CPE 2.3info

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CPE 2.2info

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• 🔒

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