CVE-2026-45385

MEDIUMNVD 4.34.3—
EchelonGraph scoreMEDIUM confidence

This medium-severity CVE scores 4.3 under NVD CVSS v3. EPSS exploit probability: 0.2%, top 90% 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
4.3
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS: 0%CVSS: 4.3Exploit: 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 0.9.5, an IDOR vulnerability exists in the Channels feature of Open WebUI, allowing any channel member to modify messages sent by other members (including administrators) within the same channel. In the update_message_by_id function, for group or dm type channels, only the caller's membership in the channel is checked via the is_user_channel_member function, without verifying message ownership. This allows any channel member to modify messages sent by other members within the same channel. This vulnerability is fixed in 0.9.5.

CVSS v3
4.3
EG Score
4.3(medium)
EPSS
10.5%
KEV
Not listed

Published

May 15, 2026

Last Modified

May 19, 2026

Advisory Details (1)

Auto-updated Jun 17, 2026
🔬 Proof of concept available. Patch available. Sources: github.
github Patch Available🟡 PoC Available

An IDOR vulnerability exists in the update_message_by_id API endpoint · Advisory · open-webui/open-webui · GitHub

https://github.com/open-webui/open-webui/security/advisories/GHSA-wwhq-cx22-f7vv

Vendor Advisories for CVE-2026-45385(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 ... 0.9.4 (156 versions)0.9.5—

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 5× in last 7d / 42× 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. 2026-07-09 19:10 UTCEPSS rescore
  2. 2026-07-08 15:16 UTCEPSS rescore
  3. 2026-07-07 13:46 UTCEPSS rescore
  4. 2026-07-06 16:27 UTCEPSS rescore
  5. 2026-07-06 02:23 UTCEPSS rescore
  6. 2026-07-05 02:30 UTCEPSS rescore
  7. 2026-07-04 06:31 UTCEPSS rescore
  8. 2026-07-01 15:07 UTCEPSS rescore
  9. 2026-06-30 23:22 UTCEPSS rescore
  10. 2026-06-29 21:23 UTCEG score recompute
  11. 2026-06-29 14:06 UTCEPSS rescore
  12. 2026-06-29 14:06 UTCEPSS rescore
  13. 2026-06-28 14:07 UTCEPSS rescore
  14. 2026-06-28 04:56 UTCEPSS rescore
  15. 2026-06-28 04:56 UTCEPSS rescore
  16. 2026-06-27 21:46 UTCEG score recompute
  17. 2026-06-27 03:08 UTCEPSS rescore
  18. 2026-06-26 20:07 UTCEG score recompute
  19. 2026-06-25 18:42 UTCEG score recompute
  20. 2026-06-25 13:49 UTCEPSS rescore
  21. 2026-06-24 14:05 UTCEPSS rescore
  22. 2026-06-23 21:33 UTCEPSS rescore
  23. 2026-06-23 21:33 UTCEPSS rescore
  24. 2026-06-22 14:25 UTCEPSS rescore
  25. 2026-06-22 14:25 UTCEPSS rescore
Show 63 more
  1. 2026-06-21 14:56 UTCEPSS rescore
  2. 2026-06-21 14:56 UTCEPSS rescore
  3. 2026-06-21 01:59 UTCEPSS rescore
  4. 2026-06-19 19:25 UTCEPSS rescore
  5. 2026-06-18 17:52 UTCEPSS rescore
  6. 2026-06-18 17:52 UTCEPSS rescore
  7. 2026-06-17 17:53 UTCEPSS rescore
  8. 2026-06-17 03:54 UTCEG score recompute
  9. 2026-06-16 17:52 UTCEPSS rescore
  10. 2026-06-16 02:41 UTCEG score recompute
  11. 2026-06-15 17:49 UTCEPSS rescore
  12. 2026-06-15 00:26 UTCEG score recompute
  13. 2026-06-13 23:11 UTCEG score recompute
  14. 2026-06-13 23:00 UTCEPSS rescore
  15. 2026-06-12 23:12 UTCEPSS rescore
  16. 2026-06-12 23:12 UTCEPSS rescore
  17. 2026-06-12 18:46 UTCEG score recompute
  18. 2026-06-11 17:34 UTCEG score recompute
  19. 2026-06-11 14:00 UTCEPSS rescore
  20. 2026-06-10 22:18 UTCEPSS rescore
  21. 2026-06-10 16:21 UTCEG score recompute
  22. 2026-06-10 13:22 UTCEPSS rescore
  23. 2026-06-10 13:22 UTCEPSS rescore
  24. 2026-06-09 15:09 UTCEG score recompute
  25. 2026-06-08 14:17 UTCEPSS rescore
  26. 2026-06-08 14:17 UTCEPSS rescore
  27. 2026-06-08 13:56 UTCEG score recompute
  28. 2026-06-07 15:25 UTCEPSS rescore
  29. 2026-06-07 15:25 UTCEPSS rescore
  30. 2026-06-07 12:44 UTCEG score recompute
  31. 2026-06-06 13:47 UTCEPSS rescore
  32. 2026-06-06 13:47 UTCEPSS rescore
  33. 2026-06-06 11:32 UTCEG score recompute
  34. 2026-06-05 22:47 UTCEPSS rescore
  35. 2026-06-05 10:19 UTCEG score recompute
  36. 2026-06-05 06:10 UTCEPSS rescore
  37. 2026-06-05 06:10 UTCEPSS rescore
  38. 2026-06-04 13:12 UTCEPSS rescore
  39. 2026-06-04 13:12 UTCEPSS rescore
  40. 2026-06-04 09:07 UTCEG score recompute
  41. 2026-06-03 07:54 UTCEG score recompute
  42. 2026-06-02 20:13 UTCEPSS rescore
  43. 2026-06-02 06:41 UTCEG score recompute
  44. 2026-06-01 13:52 UTCEPSS rescore
  45. 2026-06-01 13:52 UTCEPSS rescore
  46. 2026-06-01 05:28 UTCEG score recompute
  47. 2026-05-31 22:30 UTCEPSS rescore
  48. 2026-05-31 22:30 UTCEPSS rescore
  49. 2026-05-31 00:16 UTCEPSS rescore
  50. 2026-05-31 00:16 UTCEPSS rescore
  51. 2026-05-29 13:44 UTCEPSS rescore
  52. 2026-05-29 13:44 UTCEPSS rescore
  53. 2026-05-28 13:44 UTCEPSS rescore
  54. 2026-05-28 13:44 UTCEPSS rescore
  55. 2026-05-27 13:40 UTCEPSS rescore
  56. 2026-05-27 13:40 UTCEPSS rescore
  57. 2026-05-26 13:44 UTCEPSS rescore
  58. 2026-05-26 07:18 UTCEPSS rescore
  59. 2026-05-23 00:07 UTCEG score recompute
  60. 2026-05-21 22:43 UTCEPSS rescore
  61. 2026-05-20 22:38 UTCEPSS rescore
  62. 2026-05-20 11:58 UTCEG score recompute
  63. 2026-05-20 11:22 UTCEPSS rescore

Frequently asked(5)

What is CVE-2026-45385?
CVE-2026-45385 is a medium vulnerability published on May 15, 2026. Open WebUI is a self-hosted artificial intelligence platform designed to operate entirely offline. Prior to 0.9.5, an IDOR vulnerability exists in the Channels feature of Open WebUI, allowing any channel member to modify messages sent by other members (including administrators) within the same…
When was CVE-2026-45385 disclosed?
CVE-2026-45385 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-2026-45385 actively exploited?
CVE-2026-45385 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 10.5% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2026-45385?
CVE-2026-45385 has a CVSS v3 base score of 4.3 (NVD).
How do I remediate CVE-2026-45385?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-45385, 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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