What’s Vulnerable › Vulnerabilities

CVE-2026-87999: Open WebUI: Any authenticated user can reach the Azure platform channel via server-side web fetch

• Severity: high (CVSS 7.1 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.4% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2026-09-09 · updated 2026-09-16
• Weakness: CWE-918

Description

Open WebUI is an extensible, feature-rich, and user-friendly self-hosted AI platform. Prior to 0.11.1, POST /api/v1/retrieval/process/web and POST /api/v1/retrieval/process/web/search in backend/open_webui/retrieval/web/utils.py treated Python's globally routable address classification as proof that a destination was external. An authenticated user could make an Azure-hosted instance fetch and return content from 168.63.129.16, the Azure platform channel, as well as other reserved ranges that the standard classification did not reject. This issue is fixed in version 0.11.1.

Affected products

• open-webui: before 0.11.1 — fixed in 0.11.1

How to fix

Upgrade to a fixed version: open-webui 0.11.1. Check the vendor advisory for mitigations.

References

• https://github.com/open-webui/open-webui/commit/e3e4bd87df6fc629e7e22081d980d55a7632b8b7
• https://github.com/open-webui/open-webui/pull/27823
• https://github.com/open-webui/open-webui/releases/tag/v0.11.1
• https://github.com/open-webui/open-webui/security/advisories/GHSA-34r3-9m95-vq73
• https://github.com/open-webui/open-webui/security/advisories/GHSA-34r3-9m95-vq73

Get alerted when CVE-2026-87999 or the next vulnerability affects your stack