Risk Letters

Exploited vulnerability

CVE-2026-39987

TLP:CLEAR

Marimo Remote Code Execution Vulnerability

Marimo contains an pre-authorization remote code execution vulnerability, allowing an unauthenticated attacked to shell access and execute arbitrary system commands.

Facts

  • Vendor: Marimo
  • Product: Marimo
  • CVSS: 9.3
  • EPSS (probability of exploitation within 30 days): 99.6 %
  • On CISA's Known Exploited Vulnerabilities list since: 23 April 2026
  • First known exploitation: 23 April 2026
  • CISA's deadline for US federal agencies: 7 May 2026
  • Weakness: CWE-306
  • First seen by Risk Letters: 23 April 2026

Members see which Nordic sectors the flaw hits, and what to do about it.

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Data: NVD (public domain), CISA KEV, FIRST EPSS, MITRE ATT&CK, AlienVault OTX. NVD