Answer in brief
CVE-2026-89009 records a Unknown severity vulnerability in WAVLINK WN535M1/WN535M3 Unauthenticated Arbitrary File Write via sync_server. The current sources do not mark it as known exploited. The current feed maps WAVLINK Technology/WN535M1 (generic), WAVLINK Technology/WN535M3 (generic). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
A CVSS score is not reported in the current record. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps WAVLINK Technology/WN535M1 (generic), WAVLINK Technology/WN535M3 (generic). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| WAVLINK Technology/WN535M1generic | M35M1_V210223 | Not reported |
| WAVLINK Technology/WN535M3generic | M35M1_V210223 | Not reported |
Published upstream
Sep 11, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Sep 11, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Sep 11, 2026
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.
Quoted source text, attributed separately from HOL analysis.