CVE-2026-54011

MEDIUMNVD 5.45.4—
EchelonGraph scoreMEDIUM confidence

This medium-severity CVE scores 5.4 under NVD CVSS v3. EPSS exploit probability: 0.2%, top 90% 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, nvd
5.4
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS: 0%CVSS: 5.4Exploit: NoneExposed: 0

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

Open WebUI is a self-hosted artificial intelligence platform designed to operate entirely offline. Prior to 0.9.6,Open WebUI renders Mermaid blocks from Markdown files in the file preview panel and inserts the generated SVG into the DOM using innerHTML. Because Mermaid is configured with securityLevel: 'loose', attacker-controlled Mermaid content can be rendered unsafely in this flow. A working payload was validated through the Markdown preview path, resulting in JavaScript execution in the victim’s browser under the application origin. This vulnerability is fixed in 0.9.6.

CVSS v3
5.4
EG Score
5.4(medium)
EPSS
10.0%
KEV
Not listed

Published

June 17, 2026

Last Modified

June 25, 2026

Advisory Details (1)

Auto-updated Jun 23, 2026
🔬 Proof of concept available. Patch available. Sources: github.
github Patch Available🟡 PoC Available

Stored XSS in Mermaid Markdown Preview · Advisory · open-webui/open-webui · GitHub

https://github.com/open-webui/open-webui/security/advisories/GHSA-v8qj-hxv7-mgvv

Vendor Advisories for CVE-2026-54011(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
open-webui0.1.124 ... 0.9.5 (157 versions)0.9.6—

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 16× in last 7d / 47× 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 16:27 UTCEPSS rescore
  2. 2026-07-06 16:27 UTCEPSS rescore
  3. 2026-07-06 12:21 UTCEG score recompute
  4. 2026-07-06 02:23 UTCEPSS rescore
  5. 2026-07-06 02:23 UTCEPSS rescore
  6. 2026-07-05 06:30 UTCEG score recompute
  7. 2026-07-05 02:31 UTCEPSS rescore
  8. 2026-07-05 02:30 UTCEPSS rescore
  9. 2026-07-04 06:31 UTCEPSS rescore
  10. 2026-07-04 06:31 UTCEPSS rescore
  11. 2026-07-04 03:31 UTCEG score recompute
  12. 2026-07-03 01:19 UTCEG score recompute
  13. 2026-07-01 23:57 UTCEG score recompute
  14. 2026-07-01 15:07 UTCEPSS rescore
  15. 2026-06-30 23:22 UTCEPSS rescore
  16. 2026-06-30 22:37 UTCEG score recompute
  17. 2026-06-29 21:17 UTCEG score recompute
  18. 2026-06-29 14:06 UTCEPSS rescore
  19. 2026-06-29 14:06 UTCEPSS rescore
  20. 2026-06-28 19:58 UTCEG score recompute
  21. 2026-06-28 14:07 UTCEPSS rescore
  22. 2026-06-28 04:56 UTCEPSS rescore
  23. 2026-06-28 04:56 UTCEPSS rescore
  24. 2026-06-27 18:38 UTCEG score recompute
  25. 2026-06-27 03:08 UTCEPSS rescore
Show 22 more
  1. 2026-06-26 17:18 UTCEG score recompute▼ 3.30
  2. 2026-06-26 09:41 UTCNVD updateCVSS v3 → 5.4 · severity → MEDIUM
  3. 2026-06-26 05:12 UTCEG score recompute
  4. 2026-06-25 17:05 UTCEG score recompute
  5. 2026-06-25 13:49 UTCEPSS rescore
  6. 2026-06-25 04:59 UTCEG score recompute
  7. 2026-06-24 16:53 UTCEG score recompute
  8. 2026-06-24 14:05 UTCEPSS rescore
  9. 2026-06-24 04:46 UTCEG score recompute
  10. 2026-06-23 16:37 UTCEG score recompute
  11. 2026-06-23 04:24 UTCEG score recompute
  12. 2026-06-22 16:18 UTCEG score recompute
  13. 2026-06-22 04:10 UTCEG score recompute
  14. 2026-06-21 16:02 UTCEG score recompute
  15. 2026-06-21 03:52 UTCEG score recompute
  16. 2026-06-20 15:41 UTCEG score recompute
  17. 2026-06-20 03:29 UTCEG score recompute
  18. 2026-06-19 15:13 UTCEG score recompute
  19. 2026-06-19 03:06 UTCEG score recompute
  20. 2026-06-18 14:57 UTCEG score recompute
  21. 2026-06-18 02:50 UTCEG score recompute
  22. 2026-06-17 14:44 UTCEG score recompute

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-54011?
CVE-2026-54011 is a medium vulnerability published on June 17, 2026. Open WebUI is a self-hosted artificial intelligence platform designed to operate entirely offline. Prior to 0.9.6,Open WebUI renders Mermaid blocks from Markdown files in the file preview panel and inserts the generated SVG into the DOM using innerHTML. Because Mermaid is configured with…
When was CVE-2026-54011 disclosed?
CVE-2026-54011 was first published in the National Vulnerability Database on June 17, 2026, with the most recent update on June 25, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-54011 actively exploited?
CVE-2026-54011 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 10.0% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2026-54011?
CVE-2026-54011 has a CVSS v3 base score of 5.4 (NVD).
How do I remediate CVE-2026-54011?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-54011, 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

See which npm, PyPI, Go, and Maven packages are affected by CVE-2026-54011

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