Marimo's Pre-Authentication Flaw Gives Unauthenticated Attackers Shell Access and Arbitrary Command Execution; CISA's May 7th KEV Remediation Requirement for Covered Entities Has Long Lapsed

Last refreshed2026-09-27

Status: KEV | Advisory ID: CVE-2026-39987

Key Details

CVE	CVE-2026-39987
Vulnerability Name	Marimo Remote Code Execution Vulnerability
Affected products	Marimo Marimo
Exploitation status	Listed in CISA's Known Exploited Vulnerabilities (KEV) catalog, indicating confirmed active exploitation.
Classified as	CWE-306 (Missing Authentication for Critical Function)
KEV listing	Added to CISA's Known Exploited Vulnerabilities (KEV) catalog on 2026-04-23.
Exploitation prediction (EPSS)	37.87% probability of exploitation in the next 30 days (98% percentile) -- FIRST.org's EPSS model.
Federal remediation deadline	2026-05-07 (CISA KEV, Binding Operational Directive).

Affected Products, Subsystems & Sectors

Vendor	Product	Affected Versions	Patch Status
Marimo	Marimo

Vendor

Product

Affected Versions

Patch Status

Marimo

Subsystems	General OT
Sectors	Multiple

What to Know

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

What to Do

Monitor Marimo's web page for any future patch releases.

References

Source	Reference
NVD	https://nvd.nist.gov/vuln/detail/CVE-2026-39987
CVE	https://www.cve.org/CVERecord?id=CVE-2026-39987

Source

Reference

NVD

https://nvd.nist.gov/vuln/detail/CVE-2026-39987

CVE

https://www.cve.org/CVERecord?id=CVE-2026-39987

KEV Required Action

Field	Value
KEV Link	https://www.cisa.gov/known-exploited-vulnerabilities-catalog
Date Added to KEV	2026-04-23
Required Action Due Date	2026-05-07
Required Action	Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.

Field

Value

KEV Link

https://www.cisa.gov/known-exploited-vulnerabilities-catalog

Date Added to KEV

2026-04-23

Required Action Due Date

2026-05-07

Required Action

Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.