CVE-2026-49191

Exposed Hard-coded M3WebServer Backend API Key

CVSS 9.3 CRITICALEPSS 0.3%CWE-287

Vexday Risk Score

28Low

SSVC decision (CISA)

Track

No exploitation signal → monitor

CVSS 9.3EPSS 0.3%KEV nãoPoC —Nuclei —Metasploit —Patch —

Lifecycle

04 Jun 2026Published on NVD

Recommendation: Monitor — no exploitation signal at the moment.

The production build of the M3WebServer hard-codes its backend API keys, which can be easily intercepted through verbose error handling pages.

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

Affected products

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References