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Vulnerability record · CVE-2026-87996 · published 9 September 2026

CVE-2026-87996: Openwebui open webui toctou race condition vulnerability

Openwebui · Open Webui

Open WebUI is an extensible, feature-rich, and user-friendly self-hosted AI platform. From 0.9.6 until 0.11.1, SafePlaywrightURLLoader in backend/open_webui/retrieval/web/utils.py validated a user-controlled hostname in Python and then let the Playwright browser resolve it again in the sync and async request interceptors. An authenticated user controlling authoritative DNS could return a public address to validation and an internal address to the browser, exposing responses from internal services or cloud metadata through web search or URL ingestion. This issue is fixed in version 0.11.1.

7.7 CVSS 3.1 High EPSS 0.35% · top 73.4% CWE-367 · TOCTOU race conditionCWE-918 · Server-side request forgery (SSRF)
7.7CVSS 3.1 base score
0.35%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
5References, 2 tagged exploit
16 Sep 2026Last modified by NVD

Description

Open WebUI is an extensible, feature-rich, and user-friendly self-hosted AI platform. From 0.9.6 until 0.11.1, SafePlaywrightURLLoader in backend/open_webui/retrieval/web/utils.py validated a user-controlled hostname in Python and then let the Playwright browser resolve it again in the sync and async request interceptors. An authenticated user controlling authoritative DNS could return a public address to validation and an internal address to the browser, exposing responses from internal services or cloud metadata through web search or URL ingestion. This issue is fixed in version 0.11.1.

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://github.com/open-webui/open-webui/commit/27402ff210bfa253445720920dfb86b15a00327b Patch
https://github.com/open-webui/open-webui/pull/28634 Issue TrackingPatch
https://github.com/open-webui/open-webui/releases/tag/v0.11.1 Release Notes
https://github.com/open-webui/open-webui/security/advisories/GHSA-4v28-j6q3-5m4r ExploitVendor Advisory
https://github.com/open-webui/open-webui/security/advisories/GHSA-4v28-j6q3-5m4r ExploitVendor Advisory

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Same products first, then exploited flaws of the same weakness class.

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Source: NIST National Vulnerability Database (record CVE-2026-87996), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.