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CVE-2026-54009

Open WebUI is a self-hosted artificial intelligence platform designed to operate entirely offline. Prior to 0.9.6, POST /api/chat/completions accepts an image_url.url value that, when it does NOT start with http://, https://, or data:image/, is interpreted as a file id and resolved against the global file table with no ownership check. an authenticated user can therefore set image_url.url to another user's file id, the server reads that file from disk, base64-encodes it, and injects the data URI
Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:519d8dca50b2143477d1a9e073414b4831d4b128936b5859904ae4c152248710
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":"< 0.9.6"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:6e1e9b8b73cd1e8f61ad4c1604fe8e9cdf93a2ab92b32f41cbe09327b35a0376 · sha256:f914994bb517807b… · /containers/cna/affected/0

Provider-owned CVSS observations

1 source assertion
{"metric":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"NONE","baseScore":6.5,"baseSeverity":"MEDIUM","confidentialityImpact":"HIGH","integrityImpact":"NONE","privilegesRequired":"LOW","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N","version":"3.1"},"metric_type":"cvssV3_1"}
  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:6e1e9b8b73cd1e8f61ad4c1604fe8e9cdf93a2ab92b32f41cbe09327b35a0376 · sha256:f914994bb517807b… · /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:v2:6e1e9b8b73cd1e8f61ad4c1604fe8e9cdf93a2ab92b32f41cbe09327b35a0376 · sha256:f914994bb517807b… · /containers/cna/problemTypes/0/descriptions/0

Source references

2 source assertions
{"tags":["exploit"],"url":"https://github.com/open-webui/open-webui/security/advisories/GHSA-wch8-mhj5-9frg"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:6e1e9b8b73cd1e8f61ad4c1604fe8e9cdf93a2ab92b32f41cbe09327b35a0376 · sha256:f914994bb517807b… · /containers/adp/0/references/0
{"name":"https://github.com/open-webui/open-webui/security/advisories/GHSA-wch8-mhj5-9frg","tags":["x_refsource_CONFIRM"],"url":"https://github.com/open-webui/open-webui/security/advisories/GHSA-wch8-mhj5-9frg"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:6e1e9b8b73cd1e8f61ad4c1604fe8e9cdf93a2ab92b32f41cbe09327b35a0376 · sha256:f914994bb517807b… · /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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