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CVE-2026-87999

7.1 · HIGH

Open WebUI is an extensible, feature-rich, and user-friendly self-hosted AI platform.

Published Sep 9, 2026openwebuiCWE-918EPSS 0.36%

Overview

CVE-2026-87999 is a high-severity vulnerability affecting openwebui open_webui. It was published on September 9, 2026 and has a CVSS 3.1 base score of 7.1 (HIGH).

This vulnerability has a CVSS 3.1 base score of 7.1, rated HIGH. It can be exploited remotely over the network. Some level of privileges is required for exploitation.

Technical 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.

Remediation

Check the references section for vendor advisories and patches from openwebui. Update open_webui to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

Affected products

VendorProductVersionsStatus
openwebuiopen_webui>= 0, < 0.11.1Affected

References

GitHubgithub.com/open-webui/open-webui/commit/e3e4bd87df6fc629e7e22081d980d55a7632b8b7GitHubgithub.com/open-webui/open-webui/pull/27823GitHubgithub.com/open-webui/open-webui/releases/tag/v0.11.1GitHubgithub.com/open-webui/open-webui/security/advisories/GHSA-34r3-9m95-vq73GitHubgithub.com/open-webui/open-webui/security/advisories/GHSA-34r3-9m95-vq73

How CyberStrike helps

Frequently asked questions

What is CVE-2026-87999?

CVE-2026-87999 is a high-severity vulnerability affecting openwebui open_webui. It was published on September 9, 2026 and has a CVSS 3.1 base score of 7.1 (HIGH).

How severe is CVE-2026-87999?

This vulnerability has a CVSS 3.1 base score of 7.1, rated HIGH. It can be exploited remotely over the network. Some level of privileges is required for exploitation.

How do I fix or remediate CVE-2026-87999?

Check the references section for vendor advisories and patches from openwebui. Update open_webui to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2026-87999?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-87999 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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