CVE-2026-44552

HIGHNVD 8.78.7—
EchelonGraph scoreMEDIUM confidence

This high-severity CVE scores 8.7 under NVD CVSS v3. EPSS exploit probability: 0.3%, top 78% 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
8.7
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 0%CVSS: 8.7Exploit: 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, the tool_servers and terminal_servers keys in utils/tools.py do use a prefix. When two or more Open WebUI instances share a Redis database (a supported and documented deployment pattern, e.g., for multi-region deployments, blue-green setups, or cluster topologies), the unprefixed keys collide. An admin on Instance A writing to tool_servers overwrites the value read by Instance B — causing Instance B's users to receive Instance A's tool server configuration. This vulnerability is fixed in 0.9.0.

CVSS v3
8.7
EG Score
8.7(medium)
EPSS
22.3%
KEV
Not listed

Published

May 15, 2026

Last Modified

May 18, 2026

Advisory Details (1)

Auto-updated May 18, 2026
Patch available. Sources: github.
github Patch Available

Redis Cache Keys tool_servers and terminal_servers Missing Instance Prefix Enable Cross-Instance Cache Poisoning · Advisory · open-webui/open-webui · GitHub

https://github.com/open-webui/open-webui/security/advisories/GHSA-3x8w-4f7p-xxc2

Vendor Advisories for CVE-2026-44552(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—

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 6× in last 7d / 49× 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 106 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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  11. 2026-06-29 21:25 UTCEG score recompute
  12. 2026-06-29 14:06 UTCEPSS rescore
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  16. 2026-06-27 21:48 UTCEG score recompute
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  21. 2026-06-25 13:49 UTCEPSS rescore
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  1. 2026-06-22 14:25 UTCEPSS rescore
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  8. 2026-06-18 03:01 UTCEG score recompute
  9. 2026-06-17 17:53 UTCEPSS rescore
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  13. 2026-06-16 11:32 UTCEG score recompute
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  15. 2026-06-15 17:49 UTCEPSS rescore
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  20. 2026-06-13 08:12 UTCEG score recompute
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  23. 2026-06-12 20:09 UTCEG score recompute
  24. 2026-06-12 08:07 UTCEG score recompute
  25. 2026-06-11 20:05 UTCEG score recompute
  26. 2026-06-11 14:00 UTCEPSS rescore
  27. 2026-06-11 08:02 UTCEG score recompute
  28. 2026-06-10 22:18 UTCEPSS rescore
  29. 2026-06-10 19:59 UTCEG score recompute
  30. 2026-06-10 13:22 UTCEPSS rescore
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  32. 2026-06-10 07:56 UTCEG score recompute
  33. 2026-06-09 19:50 UTCEG score recompute
  34. 2026-06-09 07:48 UTCEG score recompute
  35. 2026-06-08 19:45 UTCEG score recompute
  36. 2026-06-08 14:17 UTCEPSS rescore
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  38. 2026-06-08 05:59 UTCEG score recompute
  39. 2026-06-07 17:57 UTCEG score recompute
  40. 2026-06-07 15:25 UTCEPSS rescore
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  42. 2026-06-07 05:55 UTCEG score recompute
  43. 2026-06-06 17:53 UTCEG score recompute
  44. 2026-06-06 13:47 UTCEPSS rescore
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  46. 2026-06-06 05:51 UTCEG score recompute
  47. 2026-06-05 22:47 UTCEPSS rescore
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  49. 2026-06-05 06:10 UTCEPSS rescore
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  52. 2026-06-04 17:44 UTCEG score recompute
  53. 2026-06-04 13:12 UTCEPSS rescore
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  55. 2026-06-04 05:42 UTCEG score recompute
  56. 2026-06-03 17:40 UTCEG score recompute
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  58. 2026-06-02 20:13 UTCEPSS rescore
  59. 2026-06-02 17:35 UTCEG score recompute
  60. 2026-06-02 05:33 UTCEG score recompute
  61. 2026-06-01 17:31 UTCEG score recompute
  62. 2026-06-01 13:52 UTCEPSS rescore
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  64. 2026-06-01 05:29 UTCEG score recompute
  65. 2026-05-31 22:30 UTCEPSS rescore
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  69. 2026-05-29 13:44 UTCEPSS rescore
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  71. 2026-05-28 13:44 UTCEPSS rescore
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  73. 2026-05-27 13:40 UTCEPSS rescore
  74. 2026-05-27 13:40 UTCEPSS rescore
  75. 2026-05-26 13:44 UTCEPSS rescore

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Frequently asked(5)

What is CVE-2026-44552?
CVE-2026-44552 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, the toolservers and terminalservers keys in utils/tools.py do use a prefix. When two or more Open WebUI instances share a Redis database (a supported and documented deployment pattern,…
When was CVE-2026-44552 disclosed?
CVE-2026-44552 was first published in the National Vulnerability Database on May 15, 2026, with the most recent update on May 18, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-44552 actively exploited?
CVE-2026-44552 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 22.3% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2026-44552?
CVE-2026-44552 has a CVSS v3 base score of 8.7 (NVD).
How do I remediate CVE-2026-44552?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-44552, 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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