CVE-2026-70488

MEDIUMPre-NVD 4.34.3—
EchelonGraph scoreMEDIUM confidence

This medium-severity CVE scores 4.3 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.4% (28th 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
4.3EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0.4%CVSS: 4.3Exploit: 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 0.9.6 until 0.11.0, the sync cleanup endpoint authorized write access to the knowledge base in the URL but then acted on directory and file ids supplied in the request body without checking that those objects belonged to that knowledge base. A user with write access to one knowledge base could delete directories and remove file embeddings from another knowledge base, causing documents to drop out of retrieval results and breaking chat-with-file for targeted documents without disclosing contents. This issue is fixed in 0.11.0.

CVSS v3
4.3
EG Score
4.3MEDIUMmedium confidence
EG Risk
19
EG Risk 19/100CISA 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%
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
28th
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
Patch available. Sources: github, github_pr, github_commit, github_release.
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 707efeaed799 (open-webui/open-webui)

Fix landed in open-webui/open-webui commit 707efeaed799 — awaiting tagged release

https://github.com/open-webui/open-webui/commit/707efeaed7992dd9896d5928559458f228b9a539
github_pr

fix: scope knowledge sync cleanup deletions to the target knowledge base

Fix merged in open-webui/open-webui PR #26722 on 2026-07-27 — awaiting tagged release

https://github.com/open-webui/open-webui/pull/26722
github Patch Available

Deletion of directories and file embeddings in other knowledge bases via sync cleanup · Advisory · open-webui/open-webui · GitHub

https://github.com/open-webui/open-webui/security/advisories/GHSA-jxc9-xmc4-gr23

Vendor Advisories for CVE-2026-70488(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(2)

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

Data Freshness Timeline

(refreshed 9× in last 7d / 44× 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 101 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
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  1. 2026-09-16 14:08 UTCEPSS rescore
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  5. 2026-09-15 03:12 UTCEPSS rescore
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  8. 2026-09-12 15:02 UTCEPSS rescore
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  10. 2026-09-11 14:53 UTCEPSS rescore
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  22. 2026-09-04 05:07 UTCEPSS rescore
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  24. 2026-09-02 14:12 UTCEPSS rescore
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  26. 2026-09-01 13:54 UTCEPSS rescore
  27. 2026-09-01 04:40 UTCEPSS rescore
  28. 2026-08-30 22:30 UTCEG score recompute
  29. 2026-08-30 19:17 UTCEPSS rescore
  30. 2026-08-30 01:22 UTCEPSS rescore
  31. 2026-08-29 21:44 UTCEG score recompute
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  34. 2026-08-26 14:47 UTCEPSS rescore
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  36. 2026-08-25 13:49 UTCEPSS rescore
  37. 2026-08-25 06:38 UTCEG score recompute
  38. 2026-08-23 04:53 UTCEG score recompute
  39. 2026-08-23 00:19 UTCEPSS rescore
  40. 2026-08-22 04:06 UTCEG score recompute
  41. 2026-08-21 23:49 UTCEPSS rescore
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  43. 2026-08-20 22:56 UTCEPSS rescore
  44. 2026-08-20 02:32 UTCEG score recompute
  45. 2026-08-19 17:04 UTCEPSS rescore
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  47. 2026-08-18 13:49 UTCEPSS rescore
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  49. 2026-08-18 00:58 UTCEG score recompute
  50. 2026-08-17 13:47 UTCEPSS rescore
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  52. 2026-08-16 14:56 UTCEPSS rescore
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  63. 2026-08-09 18:35 UTCEG score recompute
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  66. 2026-08-08 16:37 UTCEPSS rescore
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  69. 2026-08-06 13:47 UTCEPSS rescore
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  72. 2026-08-05 15:29 UTCEG score recompute
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  74. 2026-08-04 21:31 UTCEG score recompute
  75. 2026-08-04 20:44 UTCEG score recompute

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Frequently asked(5)

What is CVE-2026-70488?
CVE-2026-70488 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, the sync cleanup endpoint authorized write access to the knowledge base in the URL but then acted on directory and file ids supplied in the request body without checking that those objects…
When was CVE-2026-70488 disclosed?
CVE-2026-70488 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-2026-70488 actively exploited?
CVE-2026-70488 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.4% probability of exploitation in the next 30 days (28th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-70488?
CVE-2026-70488 has a CVSS base score of 4.3 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-70488?
A fix for CVE-2026-70488 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-70488 are linked in the Vendor Advisories panel on this page.

Dependency Blast Radius

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