CVE-2026-89009 (GCVE-0-2026-89009)
Vulnerability from cvelistv5 – Published: 2026-09-11 14:56 – Updated: 2026-09-11 14:57 Unsupported When Assigned
VLAI
EPSS
VEX
Title
WAVLINK WN535M1/WN535M3 Unauthenticated Arbitrary File Write via sync_server
Summary
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.
Severity
9.1 (Critical)
CWE
- CWE-36 - Absolute Path Traversal
Assigner
References
3 references
| URL | Tags |
|---|---|
| https://github.com/camdsmith/wavlink-sync_server-… | technical-descriptionexploit |
| https://docs.wavlink.xyz/ | productpatch |
| https://www.vulncheck.com/advisories/wavlink-wn53… | third-party-advisory |
Impacted products
2 products
| Vendor | Product | Version | CPE status | |
|---|---|---|---|---|
| WAVLINK Technology | WN535M1 |
Affected:
M35M1_V210223
(custom)
Unaffected: M35M1_V250922 (custom) |
guessed | |
| WAVLINK Technology | WN535M3 |
Affected:
M35M1_V210223
(custom)
Unaffected: M35M1_V250922 (custom) |
guessed |
Date Public
2026-08-11 00:00
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}
}
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Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
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