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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.

PUBLISHED Reserved 2026-06-12 | Published 2026-06-17 | Updated 2026-06-18 | Assigner VulnCheck




MEDIUM: 5.1CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N

MEDIUM: 6.1CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

Problem types

Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

Product status

Default status
affected

Any version before 0.23.9
affected

Credits

Elvin Suleymanov finder

References

github.com/marimo-team/marimo/releases/tag/0.23.9 release-notes

github.com/marimo-team/marimo/pull/9789 issue-tracking

github.com/...ommit/fdd55c8cf6260ae23bb411dc9d9269def5cf75d6 patch

www.vulncheck.com/...s-via-file-query-parameter-in-assets-py third-party-advisory

cve.org (CVE-2026-54386)

nvd.nist.gov (CVE-2026-54386)

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