CVE-2026-59215 open-webui CVE debrief

Who should care

Users of Open WebUI, especially those hosting it for multiple users or channels, should be aware of this issue and ensure they are running version 0.10.0 or later to prevent unauthorized access to sensitive thread information. Operators, platform administrators, vulnerability management teams, and security teams should review the vulnerability details and take necessary actions to protect their environments.

Technical summary

The vulnerability exists in the channel thread parent and reply handling of Open WebUI. An authenticated user could manipulate the URL to reference a message from another private or direct message channel, potentially disclosing thread context across channels. The CVSS score for this vulnerability is 3.1, indicating a low severity. The vulnerability is classified under CWE-639. Affected product deployments should be reviewed for exposure, and compensating controls should be considered while remediation is scheduled.

Defensive priority

Low priority, but recommended to patch for multi-user environments. Defenders should focus on verifying patch deployment, monitoring for suspicious activity, and ensuring proper URL validation and sanitization.

Recommended defensive actions

• Upgrade Open WebUI to version 0.10.0 or later
• Review and monitor channel access controls
• Ensure proper URL validation and sanitization
• Confirm whether affected product deployments exist in managed environments and assign an owner for follow-up
• Review compensating controls for exposed systems while remediation is scheduled and verified
• Check relevant monitoring, detection, and logs for exposed assets that need extra review
• Track exceptions, retest remediated assets, and close the item only after evidence is documented

Evidence notes

The CVE record was published on 2026-07-09T17:17:02.340Z and was last modified on 2026-07-13T12:27:12.263Z. The NVD entry is currently Analyzed. This issue is related to Open WebUI, a self-hosted AI platform. The vulnerability allows authenticated users to access thread context from private or direct message channels they are not a part of. Evidence of exploitation is not currently available, but defenders should verify patch deployment and monitor for suspicious activity.

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.