CVE-2026-89009Public exploitNetwork attack vector

Unauthenticated file overwrite via uncanonicalized absolute paths

Published Sep 11, 2026 · Updated Sep 15, 2026

Absolute path traversal in Wavlink WN535M1 and WN535M3 M35M1_V210223 allows remote attackers to overwrite device files via TCP port 13136. The root-run sync_server daemon uses its unauthenticated 100-byte filename field as a destination without canonicalizing or rejecting absolute paths. Network access to the service is sufficient to replace startup scripts or credential stores, enabling persistent device compromise.

CVSS severity9.1
Critical
EPSS probability0.68%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Absolute path traversal in Wavlink WN535M1 and WN535M3 M35M1_V210223 allows remote attackers to overwrite device files via TCP port 13136. The root-run sync_server daemon uses its unauthenticated 100-byte filename field as a destination without canonicalizing or rejecting absolute paths. Network access to the service is sufficient to replace startup scripts or credential stores, enabling persistent device compromise.

The record

CVE
CVE-2026-89009
Published
Sep 11, 2026
Updated
Sep 15, 2026
Vendor
Wavlink
Product
WN535M1
Classifications
CWE-36, T1190, T1547
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Sep 11, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 15, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=M35M1_V210223

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Wavlink · WN535M1version=M35M1_V210223
Wavlink · WN535M3version=M35M1_V210223

Published CVSS scores

8.8VulnCheck CNACVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:H/SC:N/SI:N/SA:N
9.1VulnCheck CNACVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-36Absolute Path Traversal
T1190Exploit Public-Facing Application
T1547Boot or Logon Autostart Execution

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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