CVE-2026-45399

HIGHNVD 7.17.1—
EchelonGraph scoreMEDIUM confidence

This high-severity CVE scores 7.1 under NVD CVSS v3. EPSS exploit probability: 0.3%, top 81% 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
Elevated
7.1
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 0%CVSS: 7.1Exploit: 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 0.9.0, any authenticated user with low privileges can enumerate active background tasks across the system and stop tasks belonging to other users via the GET /api/tasks and POST /api/tasks/stop/{task_id} methods. This allows a casual user to disrupt system-wide chat usage by continuously canceling other users' active tasks. This is a real authorization vulnerability affecting integrity and usability in multi-user deployments. This vulnerability is fixed in 0.9.0.

CVSS v3
7.1
EG Score
7.1(medium)
EPSS
18.6%
KEV
Not listed

Published

May 15, 2026

Last Modified

May 19, 2026

Advisory Details (1)

Auto-updated May 18, 2026
🔬 Proof of concept available. Patch available. Sources: github.
github Patch Available🟡 PoC Available

Low-privilege authenticated users can enumerate and stop global background tasks, causing system-wide chat disruption · Advisory · open-webui/open-webui · GitHub

https://github.com/open-webui/open-webui/security/advisories/GHSA-8jjp-r2w2-4v22

Vendor Advisories for CVE-2026-45399(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 ... 0.8.9 (151 versions)0.9.0—

Data Freshness Timeline

(refreshed 6× in last 7d / 50× 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.

Showing the most recent 100 of 105 total refreshes for this CVE.

  1. 2026-07-11 08:27 UTCEPSS rescore
  2. 2026-07-09 19:10 UTCEPSS rescore
  3. 2026-07-08 15:16 UTCEPSS rescore
  4. 2026-07-07 13:46 UTCEPSS rescore
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  9. 2026-07-01 15:07 UTCEPSS rescore
  10. 2026-06-30 23:22 UTCEPSS rescore
  11. 2026-06-29 21:23 UTCEG score recompute
  12. 2026-06-29 14:06 UTCEPSS rescore
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  14. 2026-06-28 14:07 UTCEPSS rescore
  15. 2026-06-28 10:59 UTCEG score recompute
  16. 2026-06-28 04:56 UTCEPSS rescore
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  18. 2026-06-27 21:47 UTCEG score recompute
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  20. 2026-06-27 03:08 UTCEPSS rescore
  21. 2026-06-26 20:07 UTCEG score recompute
  22. 2026-06-25 18:42 UTCEG score recompute
  23. 2026-06-25 13:49 UTCEPSS rescore
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  25. 2026-06-23 21:33 UTCEPSS rescore
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  1. 2026-06-23 21:33 UTCEPSS rescore
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  4. 2026-06-21 14:56 UTCEPSS rescore
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  6. 2026-06-21 01:59 UTCEPSS rescore
  7. 2026-06-19 19:25 UTCEPSS rescore
  8. 2026-06-18 17:52 UTCEPSS rescore
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  10. 2026-06-18 02:59 UTCEG score recompute
  11. 2026-06-17 17:53 UTCEPSS rescore
  12. 2026-06-17 13:21 UTCEG score recompute
  13. 2026-06-16 21:47 UTCEG score recompute
  14. 2026-06-16 17:52 UTCEPSS rescore
  15. 2026-06-15 23:27 UTCEG score recompute
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  17. 2026-06-15 00:26 UTCEG score recompute
  18. 2026-06-14 11:49 UTCEG score recompute
  19. 2026-06-13 23:12 UTCEG score recompute
  20. 2026-06-13 23:00 UTCEPSS rescore
  21. 2026-06-13 07:49 UTCEG score recompute
  22. 2026-06-12 23:12 UTCEPSS rescore
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  24. 2026-06-12 19:02 UTCEG score recompute
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  26. 2026-06-11 17:48 UTCEG score recompute
  27. 2026-06-11 14:00 UTCEPSS rescore
  28. 2026-06-11 05:11 UTCEG score recompute
  29. 2026-06-10 22:18 UTCEPSS rescore
  30. 2026-06-10 16:34 UTCEG score recompute
  31. 2026-06-10 13:22 UTCEPSS rescore
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  33. 2026-06-10 03:57 UTCEG score recompute
  34. 2026-06-09 15:19 UTCEG score recompute
  35. 2026-06-09 02:43 UTCEG score recompute
  36. 2026-06-08 14:17 UTCEPSS rescore
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  38. 2026-06-08 14:06 UTCEG score recompute
  39. 2026-06-08 01:29 UTCEG score recompute
  40. 2026-06-07 15:25 UTCEPSS rescore
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  42. 2026-06-07 12:52 UTCEG score recompute
  43. 2026-06-07 00:16 UTCEG score recompute
  44. 2026-06-06 13:47 UTCEPSS rescore
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  46. 2026-06-06 11:39 UTCEG score recompute
  47. 2026-06-05 23:01 UTCEG score recompute
  48. 2026-06-05 22:47 UTCEPSS rescore
  49. 2026-06-05 10:24 UTCEG score recompute
  50. 2026-06-05 06:10 UTCEPSS rescore
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  52. 2026-06-04 21:48 UTCEG score recompute
  53. 2026-06-04 13:12 UTCEPSS rescore
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  55. 2026-06-04 09:10 UTCEG score recompute
  56. 2026-06-03 20:33 UTCEG score recompute
  57. 2026-06-03 07:56 UTCEG score recompute
  58. 2026-06-02 19:19 UTCEG score recompute
  59. 2026-06-02 06:42 UTCEG score recompute
  60. 2026-06-01 18:05 UTCEG score recompute
  61. 2026-06-01 13:52 UTCEPSS rescore
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  63. 2026-06-01 05:28 UTCEG score recompute
  64. 2026-05-31 22:30 UTCEPSS rescore
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  66. 2026-05-31 00:16 UTCEPSS rescore
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  68. 2026-05-29 13:44 UTCEPSS rescore
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  70. 2026-05-28 13:44 UTCEPSS rescore
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  72. 2026-05-27 13:40 UTCEPSS rescore
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  74. 2026-05-26 13:44 UTCEPSS rescore
  75. 2026-05-26 07:18 UTCEPSS rescore

Frequently asked(5)

What is CVE-2026-45399?
CVE-2026-45399 is a high vulnerability published on May 15, 2026. Open WebUI is a self-hosted artificial intelligence platform designed to operate entirely offline. Prior to 0.9.0, any authenticated user with low privileges can enumerate active background tasks across the system and stop tasks belonging to other users via the GET /api/tasks and POST…
When was CVE-2026-45399 disclosed?
CVE-2026-45399 was first published in the National Vulnerability Database on May 15, 2026, with the most recent update on May 19, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-45399 actively exploited?
CVE-2026-45399 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 18.6% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2026-45399?
CVE-2026-45399 has a CVSS v3 base score of 7.1 (NVD).
How do I remediate CVE-2026-45399?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-45399, 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.

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