CVE-2026-89009: WAVLINK WN535M1/WN535M3 Unauthenticated Arbitrary File Write via sync_server
WAVLINK Technology · WN535M1
Vendor fix available · Affected: WAVLINK Technology WN535M1 · Exploitation: possible (1 to 10%)
Not in CyberSIXT coverage yet: no article names this CVE. This page shows the public record.
Higher than 63% of scored CVEs
DescriptionCVE.org
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.
Affected products2
From the CVE record. A product or version that is not listed is unknown, not unaffected.
- WAVLINK Technology · WN535M1M35M1_V210223
- WAVLINK Technology · WN535M3M35M1_V210223
On the Atlas
Every published CVE is on the CyberSIXT Atlas, grouped by weakness, vendor and month.
- Exploitation
- Possible (1 to 10%). EPSS between 1% and 10%.
- CISA KEV
- Not listed
- Public check
- No public nuclei template
- Vendor
- WAVLINK Technology
- Published
- September 2026
CoverageNo articles yet
No CyberSIXT article names CVE-2026-89009 yet, so there is no coverage timeline, action brief or change log for it. Everything on this page comes from the public CVE record, CISA KEV, EPSS and the nuclei template index. Search the archive or see the CVEs in the news.