EUVD-2026-16482
GHSA-jjp7-g2jw-wh3j
Severity by source
AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:L
Primary rating from GitHub Advisory · only source for this CVE.
CVSS VectorGitHub Advisory
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:L
Lifecycle Timeline
4DescriptionGitHub Advisory
Open WebUI is a self-hosted artificial intelligence platform designed to operate entirely offline. Prior to version 0.8.6, any authenticated user can overwrite any file's content by ID through the POST /api/v1/retrieval/process/files/batch endpoint. The endpoint performs no ownership check, so a regular user with read access to a shared knowledge base can obtain file UUIDs via GET /api/v1/knowledge/{id}/files and then overwrite those files, escalating from read to write. The overwritten content is served to the LLM via RAG, meaning the attacker controls what the model tells other users. Version 0.8.6 patches the issue.
AnalysisAI
Open WebUI versions prior to 0.8.6 permit authenticated users to overwrite arbitrary file contents through an insecure batch processing endpoint, escalating read-only knowledge base access to write permissions without ownership validation. Attackers with low-level privileges can manipulate RAG (Retrieval-Augmented Generation) content served to language models, poisoning AI responses delivered to other users. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Requires authenticated user account on Open WebUI versions prior to 0.8.6. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | Real-world risk is moderate-to-high despite the 7.1 CVSS score. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | An authenticated attacker with read-only access to a corporate knowledge base queries GET /api/v1/knowledge/{id}/files to enumerate file UUIDs associated with technical documentation or policy content. The attacker then sends POST requests to /api/v1/retrieval/process/files/batch with those UUIDs and malicious payloads replacing legitimate content. … |
| Remediation | Upgrade Open WebUI to version 0.8.6 or later, which includes authorization checks on the file batch processing endpoint (see GitHub Security Advisory https://github.com/open-webui/open-webui/security/advisories/GHSA-jjp7-g2jw-wh3j). … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours: Identify all Open WebUI deployments and document current versions in use. …
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