CVE-2026-27842Network attack vector

Unauthenticated configuration changes via undisclosed authentication bypass

Published Mar 11, 2026 · Updated Mar 11, 2026

Authentication bypass in Micro Research MR-GM5L-S1 and MR-GM5A-L1 before 2.01.04N1_02 allows remote attackers to change device configuration. The products expose an alternate path that skips authentication before protected configuration operations, but the endpoint and validation error are undisclosed. No account or user interaction is required; successful exploitation permits unauthorized configuration changes through the network management interface.

CVSS severity9.3
Critical
EPSS probability0.56%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Authentication bypass in Micro Research MR-GM5L-S1 and MR-GM5A-L1 before 2.01.04N1_02 allows remote attackers to change device configuration. The products expose an alternate path that skips authentication before protected configuration operations, but the endpoint and validation error are undisclosed. No account or user interaction is required; successful exploitation permits unauthorized configuration changes through the network management interface.

The record

CVE
CVE-2026-27842
Published
Mar 11, 2026
Updated
Mar 11, 2026
Vendor
Micro Research Ltd.
Product
MR-GM5A-L1
Classifications
CWE-288, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Mar 11, 2026CVE publishedPublication date reported by the CVE source.
  2. Mar 11, 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=firmware versions prior to v2.01.04N1_02

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Micro Research Ltd. · MR-GM5A-L1version=firmware versions prior to v2.01.04N1_02
Micro Research Ltd. · MR-GM5L-S1version=firmware versions prior to v2.01.04N1_02

Published CVSS scores

9.3JPCERT/CCCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
9.8JPCERT/CCCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/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.

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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)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-288Authentication Bypass Using an Alternate Path or Channel
T1190Exploit Public-Facing Application

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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