CVE-2026-45665

HIGHNVD 8.18.1—
EchelonGraph scoreMEDIUM confidence

This high-severity CVE scores 8.1 under NVD CVSS v3. EPSS exploit probability: 0.3%, top 76% 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
8.1
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 0%CVSS: 8.1Exploit: 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 0.8.0, a Stored Cross-Site Scripting (XSS) vulnerability exists in the Banner component due to an improper sanitization order (specifically, DOMPurify is executed before the marked library). This vulnerability allows a compromised or malicious administrator to plant a malicious payload in the global banner. Crucially, this vector enables Privilege Escalation, as the malicious banner is rendered for all users, including the Super Admin (Primary Admin). Consequently, the payload successfully bypasses the existing security mechanism. An attacker can leverage this to steal the Super Admin's session token This vulnerability is fixed in 0.8.0.

CVSS v3
8.1
EG Score
8.1(medium)
EPSS
24.2%
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

Stored XSS in Banner Component via Improper Sanitization Order · Advisory · open-webui/open-webui · GitHub

https://github.com/open-webui/open-webui/security/advisories/GHSA-cqp4-qqvg-3787

Vendor Advisories for CVE-2026-45665(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)
npm(1)
PackageVulnerable rangeFixed inDependents
open-webui—0.8.0—

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 7× in last 7d / 51× 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 110 total refreshes for this CVE.

  1. 2026-07-12 05:46 UTCEPSS rescore
  2. 2026-07-11 08:27 UTCEPSS rescore
  3. 2026-07-09 19:10 UTCEPSS rescore
  4. 2026-07-08 15:16 UTCEPSS rescore
  5. 2026-07-07 13:46 UTCEPSS rescore
  6. 2026-07-06 16:27 UTCEPSS rescore
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  9. 2026-07-04 06:31 UTCEPSS rescore
  10. 2026-07-01 15:07 UTCEPSS rescore
  11. 2026-06-30 23:22 UTCEPSS rescore
  12. 2026-06-29 21:22 UTCEG score recompute
  13. 2026-06-29 14:06 UTCEPSS rescore
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  15. 2026-06-28 14:07 UTCEPSS rescore
  16. 2026-06-28 09:09 UTCEG score recompute
  17. 2026-06-28 04:56 UTCEPSS rescore
  18. 2026-06-28 04:56 UTCEPSS rescore
  19. 2026-06-27 21:45 UTCEG score recompute
  20. 2026-06-27 07:45 UTCEG score recompute
  21. 2026-06-27 03:08 UTCEPSS rescore
  22. 2026-06-26 20:05 UTCEG score recompute
  23. 2026-06-25 18:39 UTCEG score recompute
  24. 2026-06-25 13:49 UTCEPSS rescore
  25. 2026-06-24 14:05 UTCEPSS rescore
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  1. 2026-06-23 21:33 UTCEPSS rescore
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  3. 2026-06-22 14:25 UTCEPSS rescore
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  5. 2026-06-21 14:56 UTCEPSS rescore
  6. 2026-06-21 14:56 UTCEPSS rescore
  7. 2026-06-21 01:59 UTCEPSS rescore
  8. 2026-06-19 19:25 UTCEPSS rescore
  9. 2026-06-18 17:52 UTCEPSS rescore
  10. 2026-06-18 17:52 UTCEPSS rescore
  11. 2026-06-18 02:54 UTCEG score recompute
  12. 2026-06-17 17:53 UTCEPSS rescore
  13. 2026-06-17 13:20 UTCEG score recompute
  14. 2026-06-16 22:28 UTCEG score recompute
  15. 2026-06-16 17:52 UTCEPSS rescore
  16. 2026-06-16 11:04 UTCEG score recompute
  17. 2026-06-15 23:24 UTCEG score recompute
  18. 2026-06-15 17:49 UTCEPSS rescore
  19. 2026-06-14 21:59 UTCEG score recompute
  20. 2026-06-14 10:34 UTCEG score recompute
  21. 2026-06-13 23:09 UTCEG score recompute
  22. 2026-06-13 23:00 UTCEPSS rescore
  23. 2026-06-13 03:59 UTCEG score recompute
  24. 2026-06-12 23:12 UTCEPSS rescore
  25. 2026-06-12 23:12 UTCEPSS rescore
  26. 2026-06-12 16:10 UTCEG score recompute
  27. 2026-06-12 04:14 UTCEG score recompute
  28. 2026-06-11 16:49 UTCEG score recompute
  29. 2026-06-11 14:00 UTCEPSS rescore
  30. 2026-06-11 05:01 UTCEG score recompute
  31. 2026-06-10 22:18 UTCEPSS rescore
  32. 2026-06-10 17:36 UTCEG score recompute
  33. 2026-06-10 13:22 UTCEPSS rescore
  34. 2026-06-10 13:22 UTCEPSS rescore
  35. 2026-06-10 06:11 UTCEG score recompute
  36. 2026-06-09 18:47 UTCEG score recompute
  37. 2026-06-09 07:23 UTCEG score recompute
  38. 2026-06-08 19:58 UTCEG score recompute
  39. 2026-06-08 14:17 UTCEPSS rescore
  40. 2026-06-08 14:17 UTCEPSS rescore
  41. 2026-06-08 08:33 UTCEG score recompute
  42. 2026-06-07 21:09 UTCEG score recompute
  43. 2026-06-07 15:25 UTCEPSS rescore
  44. 2026-06-07 15:25 UTCEPSS rescore
  45. 2026-06-07 09:45 UTCEG score recompute
  46. 2026-06-06 22:20 UTCEG score recompute
  47. 2026-06-06 13:47 UTCEPSS rescore
  48. 2026-06-06 13:47 UTCEPSS rescore
  49. 2026-06-06 10:56 UTCEG score recompute
  50. 2026-06-05 23:31 UTCEG score recompute
  51. 2026-06-05 22:47 UTCEPSS rescore
  52. 2026-06-05 12:07 UTCEG score recompute
  53. 2026-06-05 06:10 UTCEPSS rescore
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  55. 2026-06-05 00:43 UTCEG score recompute
  56. 2026-06-04 13:19 UTCEG score recompute
  57. 2026-06-04 13:12 UTCEPSS rescore
  58. 2026-06-04 13:12 UTCEPSS rescore
  59. 2026-06-04 01:54 UTCEG score recompute
  60. 2026-06-03 14:30 UTCEG score recompute
  61. 2026-06-03 03:05 UTCEG score recompute
  62. 2026-06-02 20:13 UTCEPSS rescore
  63. 2026-06-02 15:40 UTCEG score recompute
  64. 2026-06-02 04:15 UTCEG score recompute
  65. 2026-06-01 16:50 UTCEG score recompute
  66. 2026-06-01 13:52 UTCEPSS rescore
  67. 2026-06-01 13:52 UTCEPSS rescore
  68. 2026-06-01 05:26 UTCEG score recompute
  69. 2026-05-31 22:30 UTCEPSS rescore
  70. 2026-05-31 22:30 UTCEPSS rescore
  71. 2026-05-31 00:16 UTCEPSS rescore
  72. 2026-05-31 00:16 UTCEPSS rescore
  73. 2026-05-29 13:44 UTCEPSS rescore
  74. 2026-05-29 13:44 UTCEPSS rescore
  75. 2026-05-28 13:44 UTCEPSS rescore

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-45665?
CVE-2026-45665 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 0.8.0, a Stored Cross-Site Scripting (XSS) vulnerability exists in the Banner component due to an improper sanitization order (specifically, DOMPurify is executed before the marked library).…
When was CVE-2026-45665 disclosed?
CVE-2026-45665 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-2026-45665 actively exploited?
CVE-2026-45665 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 24.2% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2026-45665?
CVE-2026-45665 has a CVSS v3 base score of 8.1 (NVD).
How do I remediate CVE-2026-45665?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-45665, 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-2026-45665

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