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CVE-2026-45398

Open WebUI is a self-hosted artificial intelligence platform designed to operate entirely offline. Prior to 0.9.5, _validate_collection_access() checks the user-memory-* and file-* collection name prefixes but does not check knowledge base collections, which use raw UUIDs as collection names. Any authenticated user who knows a private knowledge base UUID can read its content through the retrieval query endpoints, even though the knowledge API correctly denies that user access. The same gap affec
Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:4d54b6b9ad0d1898a49dbf76da9d6ad514a226b1dd24940c042af9df0faccb9c
Known exploited
Not asserted
Disputed
No
Stale source
No
Conflicts
0

Affected products and versions

1 source assertion
{"product":"open-webui","vendor":"open-webui","versions":[{"status":"affected","version":"< 0.9.5"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:86b16e6fee0bc351e6fde0572e15d4d2daaad411cacd44124d9dcd3eb15deb06 · sha256:40dcb78f3580ee92… · /containers/cna/affected/0

Provider-owned CVSS observations

1 source assertion
{"metric":{"attackComplexity":"HIGH","attackVector":"NETWORK","availabilityImpact":"HIGH","baseScore":7.5,"baseSeverity":"HIGH","confidentialityImpact":"HIGH","integrityImpact":"HIGH","privilegesRequired":"LOW","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H","version":"3.1"},"metric_type":"cvssV3_1"}
  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:86b16e6fee0bc351e6fde0572e15d4d2daaad411cacd44124d9dcd3eb15deb06 · sha256:40dcb78f3580ee92… · /containers/cna/metrics/0/cvssV3_1

CWE assertions

1 source assertion
{"cweId":"CWE-639","description":"CWE-639: Authorization Bypass Through User-Controlled Key","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:86b16e6fee0bc351e6fde0572e15d4d2daaad411cacd44124d9dcd3eb15deb06 · sha256:40dcb78f3580ee92… · /containers/cna/problemTypes/0/descriptions/0

Source references

4 source assertions
{"name":"https://github.com/open-webui/open-webui/pull/22109","tags":["x_refsource_MISC"],"url":"https://github.com/open-webui/open-webui/pull/22109"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:86b16e6fee0bc351e6fde0572e15d4d2daaad411cacd44124d9dcd3eb15deb06 · sha256:40dcb78f3580ee92… · /containers/cna/references/1
{"name":"https://github.com/open-webui/open-webui/releases/tag/v0.9.5","tags":["x_refsource_MISC"],"url":"https://github.com/open-webui/open-webui/releases/tag/v0.9.5"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:86b16e6fee0bc351e6fde0572e15d4d2daaad411cacd44124d9dcd3eb15deb06 · sha256:40dcb78f3580ee92… · /containers/cna/references/2
{"tags":["exploit"],"url":"https://github.com/open-webui/open-webui/security/advisories/GHSA-4g37-7p2c-38r9"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:86b16e6fee0bc351e6fde0572e15d4d2daaad411cacd44124d9dcd3eb15deb06 · sha256:40dcb78f3580ee92… · /containers/adp/0/references/0
{"name":"https://github.com/open-webui/open-webui/security/advisories/GHSA-4g37-7p2c-38r9","tags":["x_refsource_CONFIRM"],"url":"https://github.com/open-webui/open-webui/security/advisories/GHSA-4g37-7p2c-38r9"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:86b16e6fee0bc351e6fde0572e15d4d2daaad411cacd44124d9dcd3eb15deb06 · sha256:40dcb78f3580ee92… · /containers/cna/references/0

Attribution and limitations

  • CVE Program CVEList V5: Reproduce the MITRE copyright designation and CVE license in copies. Source →

Provider severity values are preserved separately. Baitaphish does not convert them into a risk rating, infer affected products, or treat EPSS as observed exploitation.

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