What is CVE-2026-27842?

CVE-2026-27842 is a critical-severity vulnerability in Micro Research Ltd. Mr-Gm5a-L1, classified under Authentication Bypass Using an Alternate Path or Channel. CVSS score: 9.8/10. Published 2026-03-11.

How severe is CVE-2026-27842?

Critical severity. CVSS v3 base score is 9.8 out of 10.

Vulnerability in Micro Research Ltd. Mr-Gm5a-L1

CVE-2026-27842

Authentication bypass issue exists in MR-GM5L-S1 and MR-GM5A-L1, which may allow an attacker to bypass authentication and change the device configuration.

Published 2026-03-11 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.008 (53.8th percentile), scored 2026-10-02.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 54th percentile — 53.8% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.006 · newest: 0.008 · change: +0.002

Affected products

Micro Research Ltd. Mr-Gm5a-L1 — versions firmware versions prior to v2.01.04N1_02
Micro Research Ltd. Mr-Gm5l-S1 — versions firmware versions prior to v2.01.04N1_02

Weakness classification (CWE)

CWE-288 — Authentication Bypass Using an Alternate Path or Channel

References

Frequently asked questions

What is CVE-2026-27842?: CVE-2026-27842 is a critical-severity vulnerability in Micro Research Ltd. Mr-Gm5a-L1, classified under Authentication Bypass Using an Alternate Path or Channel. CVSS score: 9.8/10. Published 2026-03-11.
How severe is CVE-2026-27842?: Critical severity. CVSS v3 base score is 9.8 out of 10.