CVE-2026-54386

MEDIUM EPSS 14.9%
Published Jun 17, 20262w ago · Modified Jun 23, 20261w ago
5.1 CVSS 4.0
Medium
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Published Jun 17, 2026 2w ago
Last Modified Jun 23, 2026 1w ago

Description

marimo before 0.23.9 contains a reflected cross-site scripting vulnerability in the notebook page that allows unauthenticated attackers to inject arbitrary JavaScript by exploiting improper escaping of single quotes in the file query parameter reflected into an inline JavaScript string literal. Attackers can craft a malicious link with a payload beginning with __new__ to bypass the 404 check and inject JavaScript into the page, which executes without Content-Security-Policy restrictions in the origin of a victim's marimo server.

CVSS Details

Base Score
5.1
Exploitability
—
Impact
—
Vector string
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Attack Vector Network
Attack Complexity Low
Privileges Required None
User Interaction A
Scope X

Threat Intelligence

EPSS Exploit Probability
14.9% percentile
Exploit & Patch Status
No Known Exploit
No Patch Available

Weaknesses 1

CWE-79 Cross-site Scripting Injection

References 4

  • github.com https://github.com/marimo-team/marimo/commit/fdd55c8cf6260ae23bb411dc9d9269def5cf75d6
  • github.com https://github.com/marimo-team/marimo/pull/9789
  • github.com https://github.com/marimo-team/marimo/releases/tag/0.23.9
  • vulncheck.com https://www.vulncheck.com/advisories/marimo-xss-via-file-query-parameter-in-assets-py

Remediation

No remediation data recorded yet

Check vendor advisories and the NVD entry for patch availability.