CVE-2026-8185

Adjacent-network code execution via unauthenticated firmware upload

Published May 9, 2026 · Updated May 9, 2026

Missing authentication in UGREEN CM933 1.1.59.4319 allows remote attackers to execute code via a crafted firmware upload. The administrative interface exposes a hidden firmware-upload function that accepts attacker-supplied firmware without verifying a user identity. Access from the device's local network is required; successful upload grants control of the switch through attacker-supplied firmware.

CVSS severity5.3
Medium
EPSS probability0.32%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Missing authentication in UGREEN CM933 1.1.59.4319 allows remote attackers to execute code via a crafted firmware upload. The administrative interface exposes a hidden firmware-upload function that accepts attacker-supplied firmware without verifying a user identity. Access from the device's local network is required; successful upload grants control of the switch through attacker-supplied firmware.

The record

CVE
CVE-2026-8185
Published
May 9, 2026
Updated
May 9, 2026
Vendor
UGREEN
Product
CM933
Classifications
CWE-287, CWE-306, T1210
Attack vector
adjacent
Privileges
unauthenticated

Timeline

How it unfolded

  1. May 9, 2026CVE publishedPublication date reported by the CVE source.
  2. May 9, 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=1.1.59.4319

What conditions does exploitation require?

Attack vectoradjacent
Required privilegesunauthenticated

What is affected?

UGREEN · CM933version=1.1.59.4319

Published CVSS scores

5.3VulDB CNACVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:X
5.8VulDB CNAAV:A/AC:L/Au:N/C:P/I:P/A:P
6.3VulDB CNACVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L

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.

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No observations available

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

Weakness, pattern, technique

CWE-287Improper Authentication
CWE-306Missing Authentication for Critical Function
T1210Exploitation of Remote Services

Public exploit references

No public exploit references are available in this record.

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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