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CVE-2026-87011

7.5 · HIGH

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

Published Sep 9, 2026openwebuiCWE-405EPSS 0.64%

Overview

CVE-2026-87011 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 7.5 (HIGH).

This vulnerability has a CVSS 3.1 base score of 7.5, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

Technical description

Open WebUI is an extensible, feature-rich, and user-friendly self-hosted AI platform. From 0.9.0 until 0.11.1, the unauthenticated POST /oauth/backchannel-logout handler in backend/open_webui/utils/oauth.py fetched the OIDC discovery document and signing keys before validating a submitted logout token. Each request repeated uncached network fetches, and the signing-key lookup blocked the async event loop, so requests carrying invalid tokens could stall the single-worker instance and amplify traffic to the identity provider when ENABLE_OAUTH_BACKCHANNEL_LOGOUT was enabled. 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>= 0.9.0, < 0.11.1Affected

References

GitHubgithub.com/open-webui/open-webui/commit/aeda6ff13a25d3b3ba1b303609f35382db22142cGitHubgithub.com/open-webui/open-webui/releases/tag/v0.11.1GitHubgithub.com/open-webui/open-webui/security/advisories/GHSA-3g9q-v48f-hh9wGitHubgithub.com/open-webui/open-webui/security/advisories/GHSA-3g9q-v48f-hh9w

How CyberStrike helps

Frequently asked questions

What is CVE-2026-87011?

CVE-2026-87011 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 7.5 (HIGH).

How severe is CVE-2026-87011?

This vulnerability has a CVSS 3.1 base score of 7.5, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2026-87011?

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-2026-87011?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-87011 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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