CVE-2026-70483

MEDIUMNVD 4.34.3—
EchelonGraph scoreMEDIUM confidence

This medium-severity CVE scores 4.3 under NVD CVSS v3. EPSS exploit probability: 0.5% (37th 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, nvd
Elevated
4.3EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0.5%CVSS: 4.3Exploit: Elevated riskExposed services: Not assessed

A fix is available — apply it.

Open WebUI is an extensible, feature-rich, and user-friendly self-hosted AI platform. From 0.9.6 until 0.11.0, DELETE /api/v1/chats/{id} cancelled a chat's in-flight tasks before checking whether the caller could delete that chat. Any authenticated user who knew another user's chat id could abort that user's running model response, title generation, or tag generation, even though the delete was refused and no chat data was deleted, modified, or disclosed. This issue is fixed in 0.11.0.

CVSS v3
4.3
EG Score
4.3MEDIUMmedium confidence
EG Risk
35
EG Risk 35/100CISA 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
Severity43% × 45%
Exploitation40% × 40%
Automatability0% × 15%
CISA SSVC: Track at low or medium mission impact; Track* at high (mission-essential systems).
Action: A fix is available. Apply it within your standard update timelines.
EPSS PROB
0.5%
EPSS %ILE
37th
KEV
Not listed

CISA SSVCTrack at low or medium mission impact; Track* at high (mission-essential systems).

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

Exploitation public PoC (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 (4)

Auto-updated Sep 18, 2026
🔬 Proof of concept available. Patch available. Sources: github_commit, github_pr, github_release, github.
github Patch Available🟡 PoC Available

Any authenticated user can cancel another user's chat generation via the chat delete endpoint · Advisory · open-webui/open-webui · GitHub

https://github.com/open-webui/open-webui/security/advisories/GHSA-3vf6-64vr-3g56
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_pr

fix: authorize before cancelling tasks in the chat delete endpoint

Fix merged in open-webui/open-webui PR #27006 on 2026-07-26 — awaiting tagged release

https://github.com/open-webui/open-webui/pull/27006
github_commit

commit 4f93c3e36c17 (open-webui/open-webui)

Fix landed in open-webui/open-webui commit 4f93c3e36c17 — awaiting tagged release

https://github.com/open-webui/open-webui/commit/4f93c3e36c1734342a32c312bdb0516c66d8e93c

Vendor Advisories for CVE-2026-70483(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-webui0.10.0, 0.10.1, 0.10.2, 0.9.6
  • 0.9.6 up to 0.11.0: fixed in 0.11.0
—

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 10× in last 7d / 39× 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
  4. 2026-10-02 17:56 UTCEPSS rescore
  5. 2026-10-02 10:06 UTCEG score recompute
  6. 2026-10-01 19:50 UTCEPSS rescore
  7. 2026-10-01 02:25 UTCEG score recompute
  8. 2026-09-30 15:03 UTCEPSS rescore
  9. 2026-09-29 06:25 UTCEG score recompute
  10. 2026-09-28 13:52 UTCEPSS rescore
  11. 2026-09-27 17:59 UTCEG score recompute
  12. 2026-09-27 13:48 UTCEPSS rescore
  13. 2026-09-26 15:59 UTCEPSS rescore
  14. 2026-09-25 04:40 UTCEG score recompute
  15. 2026-09-23 22:26 UTCEG score recompute
  16. 2026-09-23 17:54 UTCEPSS rescore
  17. 2026-09-23 00:49 UTCEG score recompute
  18. 2026-09-22 03:12 UTCEG score recompute
  19. 2026-09-21 21:09 UTCEPSS rescore
  20. 2026-09-20 20:16 UTCEPSS rescore
  21. 2026-09-20 11:02 UTCEG score recompute
  22. 2026-09-19 13:23 UTCEG score recompute
  23. 2026-09-18 19:28 UTCEPSS rescore
  24. 2026-09-18 15:05 UTCEG score recompute▲ 1.20
  25. 2026-09-18 15:02 UTCNVD updateCVSS v3 → 4.3 · severity → MEDIUM
Show 55 more
  1. 2026-09-16 14:08 UTCEPSS rescore
  2. 2026-09-16 05:15 UTCEPSS rescore
  3. 2026-09-15 09:41 UTCEG score recompute
  4. 2026-09-15 03:12 UTCEPSS rescore
  5. 2026-09-12 15:02 UTCEPSS rescore
  6. 2026-09-12 03:22 UTCEG score recompute
  7. 2026-09-11 14:53 UTCEPSS rescore
  8. 2026-09-10 09:35 UTCEPSS rescore
  9. 2026-09-08 22:01 UTCEPSS rescore
  10. 2026-09-08 21:02 UTCEG score recompute
  11. 2026-09-07 16:01 UTCEPSS rescore
  12. 2026-09-06 13:47 UTCEPSS rescore
  13. 2026-09-05 18:32 UTCEG score recompute
  14. 2026-09-05 15:31 UTCEPSS rescore
  15. 2026-09-04 05:07 UTCEPSS rescore
  16. 2026-09-02 14:12 UTCEPSS rescore
  17. 2026-09-02 07:41 UTCEG score recompute
  18. 2026-09-01 13:54 UTCEPSS rescore
  19. 2026-09-01 04:40 UTCEPSS rescore
  20. 2026-08-30 19:17 UTCEPSS rescore
  21. 2026-08-30 01:22 UTCEPSS rescore
  22. 2026-08-29 21:45 UTCEG score recompute
  23. 2026-08-28 21:42 UTCEPSS rescore
  24. 2026-08-26 14:47 UTCEPSS rescore
  25. 2026-08-25 13:49 UTCEPSS rescore
  26. 2026-08-25 10:30 UTCEG score recompute
  27. 2026-08-23 00:19 UTCEPSS rescore
  28. 2026-08-22 04:11 UTCEG score recompute
  29. 2026-08-21 23:49 UTCEPSS rescore
  30. 2026-08-20 22:56 UTCEPSS rescore
  31. 2026-08-19 17:04 UTCEPSS rescore
  32. 2026-08-18 21:51 UTCEG score recompute
  33. 2026-08-18 13:49 UTCEPSS rescore
  34. 2026-08-18 13:49 UTCEPSS rescore
  35. 2026-08-17 13:47 UTCEPSS rescore
  36. 2026-08-16 14:56 UTCEPSS rescore
  37. 2026-08-16 14:56 UTCEPSS rescore
  38. 2026-08-16 02:15 UTCEPSS rescore
  39. 2026-08-15 15:32 UTCEG score recompute
  40. 2026-08-15 01:31 UTCEPSS rescore
  41. 2026-08-13 22:00 UTCEPSS rescore
  42. 2026-08-12 13:51 UTCEPSS rescore
  43. 2026-08-12 09:12 UTCEG score recompute
  44. 2026-08-11 00:00 UTCEPSS rescore
  45. 2026-08-09 13:47 UTCEPSS rescore
  46. 2026-08-09 02:53 UTCEG score recompute
  47. 2026-08-08 16:37 UTCEPSS rescore
  48. 2026-08-06 13:47 UTCEPSS rescore
  49. 2026-08-05 20:33 UTCEG score recompute
  50. 2026-08-05 19:40 UTCEG score recompute
  51. 2026-08-05 19:17 UTCEPSS rescore
  52. 2026-08-05 19:17 UTCEPSS rescore
  53. 2026-08-04 20:32 UTCEG score recompute
  54. 2026-08-04 20:06 UTCEG score recompute
  55. 2026-08-04 20:06 UTCMITRE cvelistV5first tracked

Related CVEs(same product + same CWE)

Frequently asked(5)

What is CVE-2026-70483?
CVE-2026-70483 is a medium vulnerability published on August 4, 2026. Open WebUI is an extensible, feature-rich, and user-friendly self-hosted AI platform. From 0.9.6 until 0.11.0, DELETE /api/v1/chats/{id} cancelled a chat's in-flight tasks before checking whether the caller could delete that chat. Any authenticated user who knew another user's chat id could abort…
When was CVE-2026-70483 disclosed?
CVE-2026-70483 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-2026-70483 actively exploited?
CVE-2026-70483 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.5% probability of exploitation in the next 30 days (37th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-70483?
CVE-2026-70483 has a CVSS v3 base score of 4.3 (NVD).
How do I remediate CVE-2026-70483?
A fix for CVE-2026-70483 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-70483 are linked in the Vendor Advisories panel on this page.

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