CVE-2026-70491

MEDIUMPre-NVD 6.56.5—
EchelonGraph scoreMEDIUM confidence

This medium-severity CVE scores 6.5 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.5% (39th 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, secondary
Elevated
6.5EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0.5%CVSS: 6.5Exploit: 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. In 0.10.2 and earlier, the GET /api/v1/tools/, GET /api/v1/tools/list, and GET /api/v1/tools/id/{id} endpoints in backend/open_webui/routers/tools.py returned full Python tool source to authenticated non-admin read-only users. ToolResponse deliberately omitted source and specs, but ToolUserResponse permitted extra fields and handlers spread a full tool model dump into the response, re-admitting omitted fields. A non-admin with a read grant can obtain another user's server-side tool source, which commonly embeds hard-coded API keys, credentials, and internal service URLs. This issue is fixed in 0.11.0.

CVSS v3
6.5
EG Score
6.5MEDIUMmedium confidence
EG Risk
45
EG Risk 45/100CISA 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
Severity65% × 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
39th
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 Aug 4, 2026
🔬 Proof of concept available. Patch available. Sources: github_release, github, github_commit, github_pr.
github Patch Available🟡 PoC Available

Tool source code disclosed to read-only users via the tool list and get endpoints · Advisory · open-webui/open-webui · GitHub

Affected: 0.11.0 by commit

https://github.com/open-webui/open-webui/security/advisories/GHSA-3r7g-q6cg-q2vx
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: do not expose tool source code to read-only users

Fix merged in open-webui/open-webui PR #27005 on 2026-07-27 — awaiting tagged release

https://github.com/open-webui/open-webui/pull/27005
github_commit

commit c05de13b4fca (open-webui/open-webui)

Fix landed in open-webui/open-webui commit c05de13b4fca — awaiting tagged release

https://github.com/open-webui/open-webui/commit/c05de13b4fca1ac8a17153782b46b3d0aacf491c

Vendor Advisories for CVE-2026-70491(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-webui0.1.124 ... 0.9.6 (161 versions)
  • every version 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 / 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. 2026-10-04 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 06:24 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. 2026-09-24 08:12 UTCEG score recompute
  15. 2026-09-23 17:54 UTCEPSS rescore
  16. 2026-09-23 05:29 UTCEG score recompute
  17. 2026-09-22 03:10 UTCEG score recompute
  18. 2026-09-21 21:09 UTCEPSS rescore
  19. 2026-09-20 20:51 UTCEG score recompute
  20. 2026-09-20 20:16 UTCEPSS rescore
  21. 2026-09-19 17:43 UTCEG score recompute
  22. 2026-09-18 19:28 UTCEPSS rescore
  23. 2026-09-18 03:29 UTCEG score recompute
  24. 2026-09-17 01:10 UTCEG score recompute
  25. 2026-09-16 14:08 UTCEPSS rescore
Show 74 more
  1. 2026-09-16 05:15 UTCEPSS rescore
  2. 2026-09-15 16:45 UTCEG score recompute
  3. 2026-09-15 03:12 UTCEPSS rescore
  4. 2026-09-14 11:49 UTCEG score recompute
  5. 2026-09-13 09:31 UTCEG score recompute
  6. 2026-09-12 15:02 UTCEPSS rescore
  7. 2026-09-12 07:12 UTCEG score recompute
  8. 2026-09-11 14:53 UTCEPSS rescore
  9. 2026-09-11 04:53 UTCEG score recompute
  10. 2026-09-10 09:35 UTCEPSS rescore
  11. 2026-09-10 02:35 UTCEG score recompute
  12. 2026-09-08 22:01 UTCEPSS rescore
  13. 2026-09-07 18:29 UTCEG score recompute
  14. 2026-09-07 16:01 UTCEPSS rescore
  15. 2026-09-06 13:47 UTCEPSS rescore
  16. 2026-09-06 06:25 UTCEG score recompute
  17. 2026-09-05 15:31 UTCEPSS rescore
  18. 2026-09-05 04:04 UTCEG score recompute
  19. 2026-09-04 05:07 UTCEPSS rescore
  20. 2026-09-03 17:31 UTCEG score recompute
  21. 2026-09-02 14:12 UTCEPSS rescore
  22. 2026-09-02 07:41 UTCEG score recompute
  23. 2026-09-01 13:54 UTCEPSS rescore
  24. 2026-09-01 04:40 UTCEPSS rescore
  25. 2026-08-31 00:03 UTCEG score recompute
  26. 2026-08-30 19:17 UTCEPSS rescore
  27. 2026-08-30 01:22 UTCEPSS rescore
  28. 2026-08-29 21:43 UTCEG score recompute
  29. 2026-08-28 21:42 UTCEPSS rescore
  30. 2026-08-27 19:57 UTCEG score recompute
  31. 2026-08-26 14:47 UTCEPSS rescore
  32. 2026-08-26 14:13 UTCEG score recompute
  33. 2026-08-25 13:49 UTCEPSS rescore
  34. 2026-08-25 11:49 UTCEG score recompute
  35. 2026-08-24 09:31 UTCEG score recompute
  36. 2026-08-23 07:12 UTCEG score recompute
  37. 2026-08-23 00:19 UTCEPSS rescore
  38. 2026-08-22 04:54 UTCEG score recompute
  39. 2026-08-21 23:49 UTCEPSS rescore
  40. 2026-08-21 02:35 UTCEG score recompute
  41. 2026-08-20 22:56 UTCEPSS rescore
  42. 2026-08-20 00:10 UTCEG score recompute
  43. 2026-08-19 17:04 UTCEPSS rescore
  44. 2026-08-18 21:51 UTCEG score recompute
  45. 2026-08-18 13:49 UTCEPSS rescore
  46. 2026-08-18 13:49 UTCEPSS rescore
  47. 2026-08-17 19:33 UTCEG score recompute
  48. 2026-08-17 13:47 UTCEPSS rescore
  49. 2026-08-16 15:36 UTCEG score recompute
  50. 2026-08-16 14:56 UTCEPSS rescore
  51. 2026-08-16 14:56 UTCEPSS rescore
  52. 2026-08-16 02:15 UTCEPSS rescore
  53. 2026-08-15 13:18 UTCEG score recompute
  54. 2026-08-15 01:31 UTCEPSS rescore
  55. 2026-08-14 10:59 UTCEG score recompute
  56. 2026-08-13 22:00 UTCEPSS rescore
  57. 2026-08-13 08:41 UTCEG score recompute
  58. 2026-08-12 13:51 UTCEPSS rescore
  59. 2026-08-12 06:23 UTCEG score recompute
  60. 2026-08-11 04:04 UTCEG score recompute
  61. 2026-08-11 00:00 UTCEPSS rescore
  62. 2026-08-10 01:45 UTCEG score recompute
  63. 2026-08-09 13:47 UTCEPSS rescore
  64. 2026-08-08 23:27 UTCEG score recompute
  65. 2026-08-08 16:37 UTCEPSS rescore
  66. 2026-08-07 21:08 UTCEG score recompute
  67. 2026-08-06 18:50 UTCEG score recompute
  68. 2026-08-06 13:47 UTCEPSS rescore
  69. 2026-08-05 19:17 UTCEPSS rescore
  70. 2026-08-05 19:17 UTCEPSS rescore
  71. 2026-08-05 16:31 UTCEG score recompute
  72. 2026-08-05 15:29 UTCEG score recompute
  73. 2026-08-04 21:31 UTCEG score recompute
  74. 2026-08-04 21:08 UTCEG score recompute

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Frequently asked(5)

What is CVE-2026-70491?
CVE-2026-70491 is a medium vulnerability published on August 4, 2026. Open WebUI is an extensible, feature-rich, and user-friendly self-hosted AI platform. In 0.10.2 and earlier, the GET /api/v1/tools/, GET /api/v1/tools/list, and GET /api/v1/tools/id/{id} endpoints in backend/open_webui/routers/tools.py returned full Python tool source to authenticated non-admin…
When was CVE-2026-70491 disclosed?
CVE-2026-70491 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-2026-70491 actively exploited?
CVE-2026-70491 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.5% probability of exploitation in the next 30 days (39th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-70491?
CVE-2026-70491 has a CVSS base score of 6.5 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-70491?
A fix for CVE-2026-70491 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-70491 are linked in the Vendor Advisories panel on this page.

Dependency Blast Radius

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