CVE-2026-70488 open-webui CVE debrief

Who should care

Defenders managing Open WebUI deployments, especially those with multiple knowledge bases and user access, should assess exposure and apply the fix. This includes reviewing user access and permissions for knowledge bases to ensure proper segregation of duties and monitoring for any suspicious activity related to knowledge base modifications. Prioritization is crucial for environments with multiple knowledge bases and user access, as this vulnerabilitycould

Why it matters

Defenders should prioritize verifying exposure and applying the fix, especially in environments with multiple knowledge bases and user access, as this vulnerability could lead to unauthorized knowledge base modifications and disruption of chat-with-file functionality.

• Potential unauthorized modifications to knowledge bases
• Documents may drop out of retrieval results
• Chat-with-file functionality may be disrupted for targeted documents

Technical summary

The sync cleanup endpoint in Open WebUI did not properly validate directory and file IDs, allowing users with write access to one knowledge base to modify another knowledge base. This issue is addressed in version 0.11.0. The vulnerability enables unauthorized modifications to knowledge bases, potentially causing documents to drop out of retrieval results and disrupting chat-with-file functionality for targeted documents. Defenders should prioritize verifying exposure and applying the fix, especially in environments with multiple knowledge bases and user access.

Defensive priority

Defenders should prioritize verifying exposure and applying the fix, especially in environments with multiple knowledge bases and user access.

Recommended defensive actions

• Verify if the current Open WebUI version is vulnerable (prior to 0.11.0) and apply the fix if necessary.
• Review user access and permissions for knowledge bases to ensure proper segregation of duties.
• Monitor for any suspicious activity related to knowledge base modifications.
• Confirm whether affected product deployments exist in managed environments and assign an owner for follow-up.
• Review the supplied official advisory or CVE record to validate affected scope, severity, and vendor guidance.
• Plan vendor-supported updates or mitigations through normal change control where exposure is confirmed.
• Check relevant monitoring, detection, and logs for exposed assets that need extra review.

Evidence notes

The CVE record and NVD entry provide details on the vulnerability, its impact, and the fixed version. However, additional information on exploitation or affected deployments is limited. Defenders should verify exposure and apply the fix, especially in environments with multiple knowledge bases and user access. The CVE Program record and NVD detail page offer source-provided CVE metadata and vulnerability assessment. Official references also provide details on the fix in version 0.11.0 and additional vulnerability information.

Sources and references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.