Summary
Open WebUI: Tool source code disclosed to read-only users via the tool list and get endpoints
Impact
A non-admin obtains another user's server-side tool source. Tool source commonly embeds hard-coded API keys, credentials and internal service URLs, so the practical loss frequently extends past the code itself. The attack needs no special permission beyond an ordinary account that a tool was shared with, and no user interaction. Confidentiality only: it grants no ability to create, modify or execute tools, and no integrity or availability impact.
CVE-2026-70491 has a CVSS score of 6.5 (Medium). 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 c05de13b4 (#27005) together with 310ae9130. The per-id endpoint now drops the source for callers without write access, and the two list endpoints no longer load source at all. Function specs stay visible to read users, since the chat tool listing renders a tool's functions from them. Tool execution loads source server-side, so shared tools keep working. Upgrading to 0.11.0 fully resolves the issue with no configuration change.
Frequently Asked Questions
- What is CVE-2026-70491? CVE-2026-70491 is a medium-severity security vulnerability in open-webui (pip), affecting versions <= 0.10.2. It is fixed in 0.11.0.
- How severe is CVE-2026-70491? CVE-2026-70491 has a CVSS score of 6.5 (Medium). 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-2026-70491? open-webui (pip) versions <= 0.10.2 is affected.
- Is there a fix for CVE-2026-70491? Yes. CVE-2026-70491 is fixed in 0.11.0. Upgrade to this version or later.
- Is CVE-2026-70491 exploitable, and should I be worried? Whether CVE-2026-70491 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-2026-70491 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-2026-70491? Upgrade
open-webuito 0.11.0 or later.