CVE-2026-70481 open-webui CVE debrief

Who should care

Administrators and users of Open WebUI, especially those with shared standard channels, should be aware of this vulnerability and take action to protect their instances. They should review and restrict write access to channels, monitor for suspicious activity, and update to version 0.11.0 or later.

Technical summary

Open WebUI versions between 0.5.0 and 0.11.0 had a vulnerability in standard channel message update and delete handlers. The handlers did not check if the caller wrote the message, allowing any participant with write access to rewrite or delete messages from other participants. This issue is fixed in version 0.11.0. The vulnerability affects shared standard channels, allowing unauthorized message modifications or deletions. Defenders should verify affected deployments, review official advisories, and plan vendor-supported updates or mitigations.

Defensive priority

Organizations using Open WebUI versions between 0.5.0 and 0.11.0 should prioritize updating to version 0.11.0 to prevent unauthorized message modifications or deletions.

Recommended defensive actions

• Update Open WebUI to version 0.11.0 or later
• Review and restrict write access to channels
• Monitor for suspicious activity in shared standard channels
• 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 in Open WebUI. Evidence is based on official records from CVE.org and the NVD. The vulnerability affects Open WebUI versions between 0.5.0 and 0.11.0, allowing unauthorized message modifications or deletions in shared standard channels. Defenders should verify affected deployments, review official advisories, and plan vendor-supported updates or mitigations.

Official resources