Summary
Open WebUI: SSRF into internal services via unvalidated sub-resource requests in the Playwright web loader
With the Playwright web loader enabled, Open WebUI opens user-submitted URLs in a real browser and validates the destination address before allowing the request. That check only ran for the top-level page request. Every other request the page issued was passed through unvalidated, so a page could use its own JavaScript to reach addresses the validation exists to block. Because the loader returns the page's final DOM to the requesting user, anything the page read back from those addresses ends up in the web-search or RAG output.
Preconditions
WEB_LOADER_ENGINE=playwright. This is not the default; deployments on the default web loader are unaffected.- A reachable Playwright browser, either local or via
PLAYWRIGHT_WS_URL. - Any authenticated user who can submit a URL for ingestion or trigger a web search. No administrator role is required.
- Something worth reading on a network the browser can reach. A deployment whose browser container has no route to internal services loses nothing here.
Root cause
Affected component: SafePlaywrightURLLoader in backend/open_webui/retrieval/web/utils.py, in both the sync and async request interceptors. Affected setup: only builds running the Playwright loader engine.
The interceptor was written to guard navigation, and its first action was to return early for any request whose resource type was not document. The intent was that only the page the user asked for needs address validation, but a browser page is not a single request: once the validated document loads, its scripts issue further requests under the page's own control, and those never reached the validation. The address check was therefore applied to the one request the attacker did not need to control, and skipped on every request they did.
Proof of concept
Reported against 0.10.2 by driving the interceptor directly with stand-in route and request objects, one call per resource type, against http://169.254.169.254/latest/meta-data/. The document type is aborted; every other type is continued unvalidated. The browser and the network request were seeded rather than driven end to end; the code path exercised is the one the browser reaches for each sub-resource.
Credits
- @edwardav970, identified that address validation was applied only to the top-level document request, leaving every sub-resource type unvalidated.
Impact
An authenticated user can read HTTP responses from services reachable by the browser process: cloud instance metadata, other containers on the same network, and internal APIs bound to private addresses. The content is returned to the user through the normal web-search or document-ingestion result, so this is a read primitive, not a blind one. It confers no write access and no availability impact, and it does not extend beyond what the browser's network position already allows.
Untrusted input controls the target URL of a server-initiated request, which may reach internal services not otherwise accessible from outside. Typical impact: access to internal metadata services, internal APIs, or cloud credentials.
CVE-2026-70479 has a CVSS score of 7.7 (High). The vector is network-reachable, low privileges required, and no user interaction. A CVSS score reflects the worst-case severity of the vulnerability, not your specific exposure. Whether this affects your application depends on whether the vulnerable code is present and reachable in your environment. A fixed version is available (0.11.0); upgrading removes the vulnerable code path.
Affected versions
Security releases
Kodem intelligence
Severity tells you how bad this could be in the worst case. It does not tell you whether you are exposed. Exploitability and impact are functions of runtime truth: whether the vulnerable code is present, reachable, and actually executes in your application. A vulnerable package can sit in your dependency tree and never run.
Kodem, an Intelligent Application Security platform, uses runtime intelligence to reveal which vulnerabilities actually execute in production, so teams prioritize the ones that genuinely matter. Kodem's runtime-powered SCA identifies whether this CVE is reachable in your applications.
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Fixed in 0.11.0 by commit bef63a2ae. Every intercepted request is now validated, fetched with redirects disabled, re-validated on each redirect hop and then fulfilled, so neither a sub-resource nor a redirect can land on a non-global address. The same change blocks the two paths that never reached the interceptor at all: service-worker requests, via service_workers="block", and WebSocket connections, via a route handler that never connects upstream. Upgrading to 0.11.0 fully resolves the issue; no configuration change is required.
Frequently Asked Questions
- What is CVE-2026-70479? CVE-2026-70479 is a high-severity server-side request forgery (SSRF) vulnerability in open-webui (pip), affecting versions >= 0.9.6, < 0.11.0. It is fixed in 0.11.0. Untrusted input controls the target URL of a server-initiated request, which may reach internal services not otherwise accessible from outside.
- How severe is CVE-2026-70479? CVE-2026-70479 has a CVSS score of 7.7 (High). This score reflects the worst-case severity of the vulnerability, not your specific exposure. Whether it represents real risk in your environment depends on whether the vulnerable code is present and reachable.
- Which versions of open-webui are affected by CVE-2026-70479? open-webui (pip) versions >= 0.9.6, < 0.11.0 is affected.
- Is there a fix for CVE-2026-70479? Yes. CVE-2026-70479 is fixed in 0.11.0. Upgrade to this version or later.
- Is CVE-2026-70479 exploitable, and should I be worried? Whether CVE-2026-70479 is exploitable in your environment depends on whether the vulnerable code is present and reachable. A CVSS score is a worst-case rating; it does not account for your specific deployment, configuration, or usage patterns. Kodem, an Intelligent Application Security platform, uses runtime intelligence to show which vulnerabilities actually execute in production, so you can focus on the ones that represent real risk. Get a demo
- What actually determines whether CVE-2026-70479 is exploitable, and how bad it is? Exploitability and impact are not fixed properties of a CVE. They depend on runtime truth: whether the vulnerable code is present, reachable, and actually executes in your application. A high CVSS score on a dependency that never runs is not the same as real risk. Kodem, an Intelligent Application Security platform, uses runtime intelligence to reveal which vulnerabilities actually execute in production, so teams prioritize the ones that genuinely matter.
- How do I fix CVE-2026-70479? Upgrade
open-webuito 0.11.0 or later.