CVE-2026-70486

MEDIUMNVD 5.45.4—
EchelonGraph scoreMEDIUM confidence

This medium-severity CVE scores 5.4 under NVD CVSS v3. EPSS exploit probability: 0.4% (29th 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
5.4EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0.4%CVSS: 5.4Exploit: None knownExposed services: Not assessed

A fix is available — apply it.

Open WebUI is an extensible, feature-rich, and user-friendly self-hosted AI platform. From 0.9.0 until 0.11.0, the terminal file-preview serveUrl iframe branch always granted allow-same-origin together with allow-scripts for HTML files served from the application origin. Any authenticated user with access to a configured terminal server could cause script in a previewed file to run in the Open WebUI origin, read the victim's session token from localStorage, and take over the account, with possible server-side code execution if the victim was an admin or held workspace.functions. This issue is fixed in 0.11.0.

CVSS v3
5.4
EG Score
5.4MEDIUMmedium confidence
EG Risk
24
EG Risk 24/100CISA 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
Severity54% × 45%
Exploitation0% × 40%
Automatability0% × 15%
CISA SSVC: Track at every mission impact level.
Action: A fix is available. Apply it within your standard update timelines.
EPSS PROB
0.4%
EPSS %ILE
29th
KEV
Not listed

CISA SSVCTrack at every mission impact level.

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

Exploitation none (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 Aug 4, 2026
🔬 Proof of concept available. Patch available. Sources: github_pr, github_commit, github_release, github.
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_commit

commit 65a5fad7b97d (open-webui/open-webui)

Fix landed in open-webui/open-webui commit 65a5fad7b97d — awaiting tagged release

https://github.com/open-webui/open-webui/commit/65a5fad7b97db99d490d81f4e0860282c3a4543c
github_pr

fix: gate allow-same-origin on the terminal file-preview iframe to prevent same-origin XSS

Fix merged in open-webui/open-webui PR #26907 on 2026-07-10 — awaiting tagged release

https://github.com/open-webui/open-webui/pull/26907
github Patch Available🟡 PoC Available

Same-origin XSS to account takeover via terminal file-preview iframe hardcoding allow-same-origin · Advisory · open-webui/open-webui · GitHub

Affected: 0.11.0 by

https://github.com/open-webui/open-webui/security/advisories/GHSA-3xpf-xq7r-v8c5

Vendor Advisories for CVE-2026-70486(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 ... 0.9.6 (10 versions)
  • 0.9.0 up to 0.11.0: fixed in 0.11.0
—

Weakness Classification(2)

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

Data Freshness Timeline

(refreshed 10× in last 7d / 46× 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 108 total refreshes for this CVE.

  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
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  8. 2026-09-30 15:03 UTCEPSS rescore
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  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
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  16. 2026-09-23 17:54 UTCEPSS rescore
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  22. 2026-09-19 03:33 UTCEG score recompute▼ 2.80
  23. 2026-09-18 19:28 UTCEPSS rescore
  24. 2026-09-18 15:02 UTCNVD updateCVSS v3 → 5.4 · severity → MEDIUM
  25. 2026-09-18 03:18 UTCEG score recompute
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  1. 2026-09-17 01:10 UTCEG score recompute
  2. 2026-09-16 14:08 UTCEPSS rescore
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  5. 2026-09-15 16:46 UTCEG score recompute
  6. 2026-09-15 03:12 UTCEPSS rescore
  7. 2026-09-13 23:49 UTCEG score recompute
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  11. 2026-09-11 14:53 UTCEPSS rescore
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  26. 2026-09-02 14:12 UTCEPSS rescore
  27. 2026-09-01 20:48 UTCEG score recompute
  28. 2026-09-01 13:54 UTCEPSS rescore
  29. 2026-09-01 04:40 UTCEPSS rescore
  30. 2026-08-30 21:04 UTCEG score recompute
  31. 2026-08-30 19:17 UTCEPSS rescore
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  33. 2026-08-30 01:22 UTCEPSS rescore
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  35. 2026-08-28 21:42 UTCEPSS rescore
  36. 2026-08-27 23:44 UTCEG score recompute
  37. 2026-08-27 01:20 UTCEG score recompute
  38. 2026-08-26 14:47 UTCEPSS rescore
  39. 2026-08-25 15:53 UTCEG score recompute
  40. 2026-08-25 13:49 UTCEPSS rescore
  41. 2026-08-24 17:42 UTCEG score recompute
  42. 2026-08-23 07:02 UTCEG score recompute
  43. 2026-08-23 00:19 UTCEPSS rescore
  44. 2026-08-22 08:50 UTCEG score recompute
  45. 2026-08-21 23:49 UTCEPSS rescore
  46. 2026-08-20 23:28 UTCEG score recompute
  47. 2026-08-20 22:56 UTCEPSS rescore
  48. 2026-08-20 01:17 UTCEG score recompute
  49. 2026-08-19 17:04 UTCEPSS rescore
  50. 2026-08-18 15:48 UTCEG score recompute
  51. 2026-08-18 13:49 UTCEPSS rescore
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  53. 2026-08-17 16:03 UTCEG score recompute
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  55. 2026-08-16 17:51 UTCEG score recompute
  56. 2026-08-16 14:56 UTCEPSS rescore
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  58. 2026-08-16 06:44 UTCEG score recompute
  59. 2026-08-16 02:15 UTCEPSS rescore
  60. 2026-08-15 08:33 UTCEG score recompute
  61. 2026-08-15 01:31 UTCEPSS rescore
  62. 2026-08-13 23:15 UTCEG score recompute
  63. 2026-08-13 22:00 UTCEPSS rescore
  64. 2026-08-12 13:57 UTCEG score recompute
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  66. 2026-08-11 15:45 UTCEG score recompute
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  68. 2026-08-11 00:00 UTCEPSS rescore
  69. 2026-08-09 19:22 UTCEG score recompute
  70. 2026-08-09 13:47 UTCEPSS rescore
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  72. 2026-08-08 16:37 UTCEPSS rescore
  73. 2026-08-07 22:58 UTCEG score recompute
  74. 2026-08-07 00:46 UTCEG score recompute
  75. 2026-08-06 13:47 UTCEPSS rescore

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Frequently asked(5)

What is CVE-2026-70486?
CVE-2026-70486 is a medium vulnerability published on August 4, 2026. Open WebUI is an extensible, feature-rich, and user-friendly self-hosted AI platform. From 0.9.0 until 0.11.0, the terminal file-preview serveUrl iframe branch always granted allow-same-origin together with allow-scripts for HTML files served from the application origin. Any authenticated user with…
When was CVE-2026-70486 disclosed?
CVE-2026-70486 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-2026-70486 actively exploited?
CVE-2026-70486 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.4% probability of exploitation in the next 30 days (29th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-70486?
CVE-2026-70486 has a CVSS v3 base score of 5.4 (NVD).
How do I remediate CVE-2026-70486?
A fix for CVE-2026-70486 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-70486 are linked in the Vendor Advisories panel on this page.

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