CVE-2026-54386

MEDIUMPre-NVD 6.16.1—
EchelonGraph scoreMEDIUM confidence

This medium-severity CVE scores 6.1 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.2%, top 85% of all CVEs by exploit prediction. GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).

Triggered by: NVD CVSS baseline
Sources: epss, secondary
6.1
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS: 0%CVSS: 6.1Exploit: NoneExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

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 v3
6.1
EG Score
6.1(medium)
EPSS
14.9%
KEV
Not listed

Published

June 17, 2026

Last Modified

June 23, 2026

Advisory Details (4)

Auto-updated Jun 17, 2026
Patch available. Sources: github_commit, github_pr, github_release.
generic

marimo < 0.23.9 XSS via file Query Parameter in assets.py | Advisories | VulnCheck

https://www.vulncheck.com/advisories/marimo-xss-via-file-query-parameter-in-assets-py
github_release Patch Available

0.23.9

Patch available: marimo-team/marimo 0.23.9

https://github.com/marimo-team/marimo/releases/tag/0.23.9
github_pr Patch Available

fix: escape user-controlled file_key in service worker injection

Patch available: marimo-team/marimo 0.23.9 (PR #9789 merged 2026-06-04)

https://github.com/marimo-team/marimo/pull/9789
github_commit Patch Available

commit fdd55c8cf626 (marimo-team/marimo)

Patch available: marimo-team/marimo 0.23.9 (contains commit fdd55c8cf626)

https://github.com/marimo-team/marimo/commit/fdd55c8cf6260ae23bb411dc9d9269def5cf75d6

Vendor Advisories for CVE-2026-54386(1)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Affected Packages

(1 across 1 ecosystem)
PyPI(1)
PackageVulnerable rangeFixed inDependents
marimo0.0.0 ... 0.9.9 (379 versions)0.23.9—

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 17× in last 7d / 51× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

  1. 2026-07-06 22:19 UTCEG score recompute
  2. 2026-07-06 16:27 UTCEPSS rescore
  3. 2026-07-06 16:27 UTCEPSS rescore
  4. 2026-07-06 02:23 UTCEPSS rescore
  5. 2026-07-06 02:23 UTCEPSS rescore
  6. 2026-07-05 22:15 UTCEG score recompute
  7. 2026-07-05 02:31 UTCEPSS rescore
  8. 2026-07-05 02:30 UTCEPSS rescore
  9. 2026-07-04 22:20 UTCEG score recompute
  10. 2026-07-04 06:31 UTCEPSS rescore
  11. 2026-07-04 06:31 UTCEPSS rescore
  12. 2026-07-03 22:23 UTCEG score recompute
  13. 2026-07-02 22:21 UTCEG score recompute
  14. 2026-07-01 22:26 UTCEG score recompute
  15. 2026-07-01 15:07 UTCEPSS rescore
  16. 2026-06-30 23:22 UTCEPSS rescore
  17. 2026-06-30 22:30 UTCEG score recompute
  18. 2026-06-29 22:35 UTCEG score recompute
  19. 2026-06-29 14:06 UTCEPSS rescore
  20. 2026-06-29 14:06 UTCEPSS rescore
  21. 2026-06-28 22:40 UTCEG score recompute
  22. 2026-06-28 14:07 UTCEPSS rescore
  23. 2026-06-28 04:56 UTCEPSS rescore
  24. 2026-06-28 04:56 UTCEPSS rescore
  25. 2026-06-27 22:45 UTCEG score recompute
Show 26 more
  1. 2026-06-27 03:08 UTCEPSS rescore
  2. 2026-06-26 22:49 UTCEG score recompute
  3. 2026-06-25 22:54 UTCEG score recompute
  4. 2026-06-25 13:49 UTCEPSS rescore
  5. 2026-06-24 22:58 UTCEG score recompute
  6. 2026-06-24 14:05 UTCEPSS rescore
  7. 2026-06-23 23:03 UTCEG score recompute
  8. 2026-06-23 21:33 UTCEPSS rescore
  9. 2026-06-23 21:33 UTCEPSS rescore
  10. 2026-06-22 23:08 UTCEG score recompute
  11. 2026-06-22 14:25 UTCEPSS rescore
  12. 2026-06-22 14:25 UTCEPSS rescore
  13. 2026-06-21 23:09 UTCEG score recompute
  14. 2026-06-21 14:56 UTCEPSS rescore
  15. 2026-06-21 14:56 UTCEPSS rescore
  16. 2026-06-21 01:59 UTCEPSS rescore
  17. 2026-06-21 01:59 UTCEPSS rescore
  18. 2026-06-20 23:09 UTCEG score recompute
  19. 2026-06-19 23:11 UTCEG score recompute
  20. 2026-06-19 19:26 UTCEPSS rescore
  21. 2026-06-19 19:26 UTCEPSS rescore
  22. 2026-06-18 23:16 UTCEG score recompute
  23. 2026-06-18 17:52 UTCEPSS rescore
  24. 2026-06-18 17:52 UTCEPSS rescore
  25. 2026-06-17 23:17 UTCEG score recompute
  26. 2026-06-17 23:16 UTCNVD updatefirst tracked

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-54386?
CVE-2026-54386 is a medium vulnerability published on June 17, 2026. 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.…
When was CVE-2026-54386 disclosed?
CVE-2026-54386 was first published in the National Vulnerability Database on June 17, 2026, with the most recent update on June 23, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-54386 actively exploited?
CVE-2026-54386 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 14.9% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2026-54386?
CVE-2026-54386 has a CVSS v3 base score of 6.1 (NVD).
How do I remediate CVE-2026-54386?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-54386, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

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