CVE-2026-89009 WAVLINK WN535M - Arbitrary File Write

WAVLINK WN535M1 and WN535M3 routers < M35M1_V250922 contain an unauthenticated arbitrary file write vulnerability caused by lack of path canonicalization in sync_server daemon on TCP port 13136, letting remote attackers overwrite files as root, exploit requires no authentication.

CVSS base score 9.1 /10
Critical
CISA KEV
Not listed
Public exploit
None known
Authentication
Not required
EPSS
1.01% chance of exploitation in 30 days
View the NVD record ↗

Details

Type
Arbitrary File Write
Impact
File System Write, Privilege Escalation
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H
Published
11 September 2026
Updated
15 October 2026
Weakness
CWE-36

Vendor fix

Update to firmware version M35M1_V250922 or later.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

References

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