CVE-2026-54021

MEDIUMPre-NVD 6.36.3—
EchelonGraph scoreMEDIUM confidence

This medium-severity CVE scores 6.3 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.2%, top 89% 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
6.3
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS: 0%CVSS: 6.3Exploit: 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, several direct, index-addressed Ollama proxy routes accept a caller-supplied url_idx path parameter and use it as a raw index into the admin-configured OLLAMA_BASE_URLS list. Access control on these routes validates only whether the user may use the requested model, never which backend the request is routed to. Any authenticated user can append an arbitrary url_idx to force their request onto an Ollama backend they were never authorized to reach, including internal, higher-privilege, or explicitly admin-disabled backends. This vulnerability is fixed in 0.9.6.

CVSS v3
6.3
EG Score
6.3(medium)
EPSS
11.3%
KEV
Not listed

Published

June 17, 2026

Last Modified

June 26, 2026

Advisory Details (1)

Auto-updated Jun 23, 2026
Patch available. Sources: github.
github Patch Available

Authenticated users can target arbitrary configured Ollama backends via unguarded url_idx path parameter · Advisory · open-webui/open-webui · GitHub

https://github.com/open-webui/open-webui/security/advisories/GHSA-9rpj-v7hf-vv2w

Vendor Advisories for CVE-2026-54021(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 17× in last 7d / 37× 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 19:11 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 17:26 UTCEG score recompute
  7. 2026-07-05 02:31 UTCEPSS rescore
  8. 2026-07-05 02:30 UTCEPSS rescore
  9. 2026-07-04 16:04 UTCEG score recompute
  10. 2026-07-04 06:31 UTCEPSS rescore
  11. 2026-07-04 06:31 UTCEPSS rescore
  12. 2026-07-03 14:42 UTCEG score recompute
  13. 2026-07-02 13:20 UTCEG score recompute
  14. 2026-07-01 15:07 UTCEPSS rescore
  15. 2026-07-01 11:57 UTCEG score recompute
  16. 2026-06-30 23:22 UTCEPSS rescore
  17. 2026-06-30 10:36 UTCEG score recompute
  18. 2026-06-29 14:06 UTCEPSS rescore
  19. 2026-06-29 14:06 UTCEPSS rescore
  20. 2026-06-29 09:11 UTCEG score recompute
  21. 2026-06-28 14:07 UTCEPSS rescore
  22. 2026-06-28 07:49 UTCEG score recompute
  23. 2026-06-28 04:56 UTCEPSS rescore
  24. 2026-06-28 04:56 UTCEPSS rescore
  25. 2026-06-27 06:27 UTCEG score recompute
Show 12 more
  1. 2026-06-27 03:08 UTCEPSS rescore
  2. 2026-06-26 05:06 UTCEG score recompute
  3. 2026-06-25 13:49 UTCEPSS rescore
  4. 2026-06-25 03:45 UTCEG score recompute
  5. 2026-06-24 14:05 UTCEPSS rescore
  6. 2026-06-24 02:23 UTCEG score recompute
  7. 2026-06-23 01:01 UTCEG score recompute
  8. 2026-06-21 23:39 UTCEG score recompute
  9. 2026-06-20 22:16 UTCEG score recompute
  10. 2026-06-19 20:53 UTCEG score recompute
  11. 2026-06-18 19:29 UTCEG score recompute
  12. 2026-06-17 18:07 UTCEG score recompute

Frequently asked(5)

What is CVE-2026-54021?
CVE-2026-54021 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, several direct, index-addressed Ollama proxy routes accept a caller-supplied urlidx path parameter and use it as a raw index into the admin-configured OLLAMABASEURLS list. Access…
When was CVE-2026-54021 disclosed?
CVE-2026-54021 was first published in the National Vulnerability Database on June 17, 2026, with the most recent update on June 26, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-54021 actively exploited?
CVE-2026-54021 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 11.3% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2026-54021?
CVE-2026-54021 has a CVSS v3 base score of 6.3 (NVD).
How do I remediate CVE-2026-54021?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-54021, 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-2026-54021

Explore →

Is Your Infrastructure Affected by CVE-2026-54021?

EchelonGraph automatically scans your cloud infrastructure and maps CVE exposure using blast radius analysis.

Start Free Scan →Browse All CVEs