CVE-2026-54020

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: 0.3% (15th percentile of EPSS-scored CVEs). 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
6.3EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0.3%CVSS: 6.3Exploit: None knownExposed services: Not assessed

A fix is available — apply it.

Open WebUI is an extensible, feature-rich, and user-friendly self-hosted AI platform. Prior to 0.11.0, Open WebUI resolved a hostname during URL validation and rejected private, loopback, and link-local addresses, but the HTTP clients resolved the hostname again at connection time. An authenticated attacker who controlled authoritative DNS for a submitted hostname could answer with a public address during validation and an internal one during connection, reaching cloud metadata, loopback admin APIs, or internal services through URL ingest, chat image_url fetches, image editing, or OAuth profile-picture fetches, with most paths returning the response to the attacker and the OAuth path forwarding the OAuth access token. This issue is fixed in 0.11.0.

CVSS v3
6.3
EG Score
6.3MEDIUMmedium confidence
EG Risk
28
EG Risk 28/100CISA SSVC

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity63% × 45%
Exploitation0% × 40%
Automatability0% × 15%
CISA SSVC: Track at every mission impact level.
Action: A fix is available. Apply it within your standard update timelines.
EPSS PROB
0.3%
EPSS %ILE
15th
KEV
Not listed

CISA SSVCTrack at every mission impact level.

A fix is available. Apply it within your standard update timelines.

Exploitation none (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). Mission impact is CISA's Mission & Well-being decision point, and only you can judge it: high means the affected system is essential to your organisation's mission, or its compromise could cause irreversible harm to people. CISA's decision table

Published

August 4, 2026

Last Modified

September 18, 2026

Advisory Details (2)

Auto-updated Aug 4, 2026
Patch available. Sources: github, github_release.
github_release Patch Available

v0.11.0

Patch available: open-webui/open-webui v0.11.0

https://github.com/open-webui/open-webui/releases/tag/v0.11.0
github Patch Available

Any authenticated user can reach internal services via DNS rebinding on server-side URL fetches · Advisory · open-webui/open-webui · GitHub

Affected: v0.11.0 (

https://github.com/open-webui/open-webui/security/advisories/GHSA-h6x2-583h-x99r

Vendor Advisories for CVE-2026-54020(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 rangeFix by version rangeDependents
open-webui0.1.124 ... 0.9.6 (161 versions)
  • every version up to 0.11.0: fixed in 0.11.0
—

Weakness Classification(2)

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

Data Freshness Timeline

(refreshed 11× in last 7d / 44× 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. 2026-10-04 23:22 UTCEPSS rescore
  2. 2026-10-04 06:09 UTCEG score recompute
  3. 2026-10-03 14:26 UTCEPSS rescore
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  6. 2026-10-01 19:50 UTCEPSS rescore
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  8. 2026-09-30 15:03 UTCEPSS rescore
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  11. 2026-09-28 13:51 UTCEPSS rescore
  12. 2026-09-27 17:59 UTCEG score recompute
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  18. 2026-09-23 17:54 UTCEPSS rescore
  19. 2026-09-23 03:56 UTCEG score recompute
  20. 2026-09-22 03:10 UTCEG score recompute
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  22. 2026-09-20 20:16 UTCEPSS rescore
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  24. 2026-09-18 19:28 UTCEPSS rescore
  25. 2026-09-18 15:04 UTCEG score recompute
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  1. 2026-09-17 19:31 UTCEPSS rescore
  2. 2026-09-17 16:12 UTCEG score recompute
  3. 2026-09-16 14:08 UTCEPSS rescore
  4. 2026-09-16 11:14 UTCEG score recompute
  5. 2026-09-16 05:15 UTCEPSS rescore
  6. 2026-09-15 06:53 UTCEG score recompute
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  8. 2026-09-13 16:47 UTCEPSS rescore
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  11. 2026-09-11 14:53 UTCEPSS rescore
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  13. 2026-09-10 09:35 UTCEPSS rescore
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  15. 2026-09-08 22:01 UTCEPSS rescore
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  18. 2026-09-06 13:47 UTCEPSS rescore
  19. 2026-09-06 12:25 UTCEG score recompute
  20. 2026-09-05 11:20 UTCEG score recompute
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  22. 2026-09-04 05:06 UTCEPSS rescore
  23. 2026-09-03 07:20 UTCEG score recompute
  24. 2026-09-02 14:12 UTCEPSS rescore
  25. 2026-09-02 00:02 UTCEG score recompute
  26. 2026-09-01 13:54 UTCEPSS rescore
  27. 2026-09-01 04:40 UTCEPSS rescore
  28. 2026-08-30 22:30 UTCEG score recompute
  29. 2026-08-30 19:17 UTCEPSS rescore
  30. 2026-08-30 01:22 UTCEPSS rescore
  31. 2026-08-29 21:44 UTCEG score recompute
  32. 2026-08-28 21:41 UTCEPSS rescore
  33. 2026-08-27 14:25 UTCEPSS rescore
  34. 2026-08-27 08:15 UTCEG score recompute
  35. 2026-08-26 14:46 UTCEPSS rescore
  36. 2026-08-26 07:24 UTCEG score recompute
  37. 2026-08-25 13:49 UTCEPSS rescore
  38. 2026-08-25 06:38 UTCEG score recompute
  39. 2026-08-23 04:53 UTCEG score recompute
  40. 2026-08-23 00:19 UTCEPSS rescore
  41. 2026-08-22 04:06 UTCEG score recompute
  42. 2026-08-21 23:49 UTCEPSS rescore
  43. 2026-08-21 03:19 UTCEG score recompute
  44. 2026-08-20 22:55 UTCEPSS rescore
  45. 2026-08-20 02:32 UTCEG score recompute
  46. 2026-08-19 17:04 UTCEPSS rescore
  47. 2026-08-19 01:45 UTCEG score recompute
  48. 2026-08-18 13:48 UTCEPSS rescore
  49. 2026-08-18 00:58 UTCEG score recompute
  50. 2026-08-17 13:47 UTCEPSS rescore
  51. 2026-08-16 23:57 UTCEG score recompute
  52. 2026-08-16 14:56 UTCEPSS rescore
  53. 2026-08-16 02:14 UTCEPSS rescore
  54. 2026-08-15 23:11 UTCEG score recompute
  55. 2026-08-15 01:30 UTCEPSS rescore
  56. 2026-08-14 22:24 UTCEG score recompute
  57. 2026-08-13 22:00 UTCEPSS rescore
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  59. 2026-08-12 13:51 UTCEPSS rescore
  60. 2026-08-11 20:06 UTCEG score recompute
  61. 2026-08-11 00:00 UTCEPSS rescore
  62. 2026-08-09 18:34 UTCEG score recompute
  63. 2026-08-09 13:46 UTCEPSS rescore
  64. 2026-08-08 17:48 UTCEG score recompute
  65. 2026-08-08 16:37 UTCEPSS rescore
  66. 2026-08-07 17:02 UTCEG score recompute
  67. 2026-08-06 16:15 UTCEG score recompute
  68. 2026-08-06 13:47 UTCEPSS rescore
  69. 2026-08-05 19:17 UTCEPSS rescore
  70. 2026-08-05 15:29 UTCEG score recompute
  71. 2026-08-05 14:37 UTCEG score recompute
  72. 2026-08-04 21:31 UTCEG score recompute
  73. 2026-08-04 20:44 UTCEG score recompute
  74. 2026-08-04 20:40 UTCMITRE cvelistV5first tracked

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Frequently asked(5)

What is CVE-2026-54020?
CVE-2026-54020 is a medium vulnerability published on August 4, 2026. Open WebUI is an extensible, feature-rich, and user-friendly self-hosted AI platform. Prior to 0.11.0, Open WebUI resolved a hostname during URL validation and rejected private, loopback, and link-local addresses, but the HTTP clients resolved the hostname again at connection time. An authenticated…
When was CVE-2026-54020 disclosed?
CVE-2026-54020 was first published on August 4, 2026, with the most recent update on September 18, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-54020 actively exploited?
CVE-2026-54020 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.3% probability of exploitation in the next 30 days (15th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-54020?
CVE-2026-54020 has a CVSS base score of 6.3 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-54020?
A fix for CVE-2026-54020 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-54020 are linked in the Vendor Advisories panel on this page.

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