CVE-2026-54386marimo < 0.23.9 XSS via file Query Parameter in assets.py
Updated under an hour ago ()
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It affects marimo-team marimo. Add what you run to find out whether that includes you.
No exploitation reported and no EPSS estimate yet.
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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
- 6.1 MEDIUM (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
- Weakness (CWE)
- CWE-79
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- VulnCheck
- NVD analysis
- Deferred
- Record last updated
- Oct 8, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
marimo-team marimo marimo_team:marimo (from the name) | before 0.23.9 | CNA record |
References
- https://github.com/marimo-team/marimo/releases/tag/0.23.9release-notes
- https://github.com/marimo-team/marimo/pull/9789issue-tracking
- https://github.com/marimo-team/marimo/commit/fdd55c8cf6260ae23bb411dc9d9269def5cf75d6patch
- https://www.vulncheck.com/advisories/marimo-xss-via-file-query-parameter-in-assets-pythird-party-advisory
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.