SSRF in Open-Webui
CVE-2026-87996
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.
Vulnerability class: TOCTOU (Time-of-Check to Time-of-Use)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.7 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N.
EPSS exploit prediction
EPSS: 0.004 (28.0th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 28th percentile — 28.0% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.004 · newest: 0.004 · change: 0.000
Affected products
- Open-Webui — versions >= 0.9.6, < 0.11.1
- Openwebui Open Webui
Weakness classification (CWE)
References
- github.com/open-webui/open-webui/security/advisories/GHSA-4v28-j6q3-5m4r (Exploit, Vendor Advisory)
- github.com/open-webui/open-webui/pull/28634 (Patch, Issue Tracking)
- github.com/open-webui/open-webui/commit/27402ff210bfa253445720920dfb86b15a00327b (Patch)
- github.com/open-webui/open-webui/releases/tag/v0.11.1 (Release Notes)
Frequently asked questions
- What is CVE-2026-87996?
- CVE-2026-87996 is a high-severity vulnerability in Open-Webui, classified under Time-of-check Time-of-use (TOCTOU) Race Condition. CVSS score: 7.7/10. Published 2026-09-09.
- How severe is CVE-2026-87996?
- High severity. CVSS v3 base score is 7.7 out of 10.