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CVE-2026-89009— WAVLINK WN535M1/WN535M3 Unauthenticated Arbitrary File Write via sync_server

Quick assessment

Affected
WAVLINK Technology WN535M1
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

WAVLINK WN535M1 和 WN535M3 路由器在运行早于 M35M1_V250922 版本的固件时，存在一个未经身份验证的任意文件写入漏洞。该漏洞允许远程攻击者向监听 TCP 13136 端口的 守护进程发送特制的有效载荷，从而覆盖设备上的任意文件。该守护进程以 root 权限运行且无需身份验证，其协议头中的 100 字节文件名字段未进行路径规范化（path canonicalization）处理，允许攻击者通过提供绝对路径，将任意内容写入以覆盖启动脚本或凭据存储文件，从而实现系统级的持久化入侵。

CVSS 9.1 · Critical

Possible ATT&CK Techniques 2 AI

T1079 T1083 · File and Directory Discovery
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I. Basic Information for CVE-2026-89009

Vulnerability Information
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Vulnerability Title
WAVLINK WN535M1/WN535M3 Unauthenticated Arbitrary File Write via sync_server
Source: CVE Program / CVE List V5
Vulnerability Description
WAVLINK WN535M1 and WN535M3 routers running firmware prior to M35M1_V250922 contain an unauthenticated arbitrary file write vulnerability that allows remote attackers to overwrite any file on the device by sending a crafted payload to the sync_server daemon on TCP port 13136. The daemon, which runs as root and requires no authentication, accepts a 100-byte filename field in its protocol header without path canonicalization, allowing attackers to supply an absolute path and write arbitrary content to overwrite startup scripts or credential stores to achieve persistent system compromise.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
绝对路径遍历
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
WAVLINK Technology WN535M1 M35M1_V210223 -
WAVLINK Technology WN535M3 M35M1_V210223 -

II. Public POCs for CVE-2026-89009

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III. Intelligence Information for CVE-2026-89009

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Vendor Advisories for CVE-2026-89009 (1)

Proof of Concept for CVE-2026-89009 (1)

Other References for CVE-2026-89009 (1)

IV. Related Vulnerabilities

Same product: WN535M1
Same vendor: WAVLINK Technology
Same weakness: CWE-36

V. Comments for CVE-2026-89009

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