Is CVE-2026-45395 exploited in the wild?

No. Junglewise Threat Intelligence has no report of CVE-2026-45395 being exploited in the wild.

How severe is CVE-2026-45395?

High severity, with a CVSS score of 7.2, published 15 May 2026.

Which products and versions are affected?

open-webui (npm) SEMVER:introduced=0,fixed=0.9.5.

Is there a fix for CVE-2026-45395?

Yes. open-webui (npm): upgrade to 0.9.5 or later. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

How is CVE-2026-45395 attacked?

It is attacked over the network, in a network appliance.

Am I affected by CVE-2026-45395?

Check whether you run open-webui (npm) at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

CVE-2026-45395: Open WebUI authorization bypass in tool update endpoint

CVE-2026-45395 · Severity: high · CVSS 7.2 · Published 2026-05-15

Open WebUI is an interface for interacting with large language models. A security flaw in the 'Tools' component—which allows users to extend the system with custom Python scripts—fails to properly check permissions when a tool is updated. This allows a user who has been granted basic editing access to a tool to inject and execute malicious code on the server, potentially leading to a full system takeover, data theft, or unauthorized access to internal networks.

Technologies: open-webui (npm). Vendors: npm.

Quick answers

Is CVE-2026-45395 exploited in the wild?: No. Junglewise Threat Intelligence has no report of CVE-2026-45395 being exploited in the wild.
How severe is CVE-2026-45395?: High severity, with a CVSS score of 7.2, published 15 May 2026.
Which products and versions are affected?: open-webui (npm) SEMVER:introduced=0,fixed=0.9.5.
Is there a fix for CVE-2026-45395?: Yes. open-webui (npm): upgrade to 0.9.5 or later. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
How is CVE-2026-45395 attacked?: It is attacked over the network, in a network appliance.
Am I affected by CVE-2026-45395?: Check whether you run open-webui (npm) at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

How to fix

open-webui (npm): upgrade to 0.9.5 or later
```
npm install open-webui@0.9.5
```

Technical details

The vulnerability exists in the `update_tools_by_id` function within `backend/open_webui/routers/tools.py`. While the tool creation endpoint correctly enforces the `workspace.tools` permission, the update endpoint (`POST /api/v1/tools/id/{id}/update`) only verifies if the user is the owner or has a 'write' access grant. Because updating a tool triggers the `exec()` sink to load Python content, an attacker with 'write' access can replace the tool's content with malicious Python code. This results in Remote Code Execution (RCE) as the user running the application (often root in Docker environments), bypassing the intended security boundary where only trusted users should manage tools. The issue is fixed in version 0.9.5.

Affected products

Open WebUI Open WebUI < 0.9.5

Identifiers

CVE-2026-45395
GHSA-p4fx-23fq-jfg6

Timeline

2026-05-14: advisory: GitHub Advisory published
2026-05-14: patched: Fixed in version 0.9.5

References

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