GHSA-6xhv-rxhv-pwm4 is a medium-severity (CVSS 5.3) CWE-862 vulnerability in open-webui. A fix is available for open-webui — see the affected versions and patch details below.
Open WebUI: Cross-user file content disclosure via request-scoped direct model knowledge metadata
Exploitation Status
No confirmed exploitation observed yet
- CISA’s own triage has not observed active exploitation or public proof-of-concept code for this CVE as of its last assessment.
Exploitation and automatability from CISA’s SSVC triage for GHSA-6xhv-rxhv-pwm4.
EPSS Exploitation Probability
EPSS (Exploit Prediction Scoring System) is a daily probability model maintained by FIRST.org. It estimates the likelihood a CVE will be exploited in production environments within the next 30 days, derived from real-world threat intelligence signals.
How urgent is this, really
GHSA-6xhv-rxhv-pwm4 plotted by exploitation likelihood (EPSS) against impact (CVSS). The shaded corner — EPSS 50%+ and CVSS 7.0+ — is where this CVE doesn't sit, though severity or exploitability alone can still warrant action.
Where this sits among everything scored
Of 376,715 CVEs with a current EPSS score, this one falls in the < 10% band (highlighted). Real counts from FIRST.org, not a sample — log-scaled since the landscape is heavily right-skewed.
Real-World Exposure
open-webuiReal-time download stats are indexed for npm and PyPI packages. This vulnerability affects PyPI packages — download data is not available via public APIs for these ecosystems.
Description
Summary
Open WebUI lets a client define a model inline on a chat request instead of selecting a saved workspace model. The knowledge attached to such an inline model was used as-is, without checking that the caller can read what it points at. Any authenticated user who knows another user's file id could therefore have the builtin knowledge tools return that file's indexed content back to them.
Preconditions
Authenticated user of any role, no admin rights needed. The request must carry a session id and use native function calling, which is the default (only function_calling: legacy opts out), and the model's builtin_tools capability must not be disabled (default enabled). The attacker must already know the target file's id; ids are UUIDs and are not enumerable through this path. No admin setting needs to be turned on: enabling Direct Connections is not required for the backend to accept an inline model. Knowledge bases attached this way were never affected, their own access grants were enforced on every path.
Impact
An authenticated user could read the indexed chunks of another user's or group's file, a cross-user confidentiality loss limited to files whose ids the attacker already holds. It is read-only: nothing is modified or deleted, knowledge-base permissions are unaffected, and saved workspace models were already validated at creation time.
Fix
Fixed in 0.11.0 by commit 305880f2e. An inline model's attached knowledge is filtered against the caller's real read access before it is used, dropping any file, knowledge base or note the caller cannot read. Upgrading fully resolves it, no configuration change is required.
Root cause
Affected component: the chat completion, chat completed and chat action endpoints, which accept an inline model definition, and the builtin knowledge tools that consume the model's attached knowledge. Affected setups: all builds from 0.8.8 through 0.10.2.
Saved workspace models have their attached file references validated against the author when the model is created, updated or imported, so a stored model can only carry files its creator can read. An inline model never passes through that path, yet everything downstream treated its attached knowledge with the same trust, including a helper that grants read access to a file purely because the running model claims it as attached knowledge. The missing control was an access check at the point where client-supplied model metadata enters the request.
Credits
Reported by @whyiug.
Affected Packages
| Ecosystem | Package | Vulnerable range | Fix |
|---|---|---|---|
| 🐍PyPI | open-webui | ≥ 0.8.8&&< 0.11.0 | 0.11.0pip install --upgrade 'open-webui==0.11.0' |
Detection & mitigation playbook
Open-source dependencyDetect
Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for open-webui, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.
Fix
Update open-webui to 0.11.0 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms GHSA-6xhv-rxhv-pwm4 is resolved across your whole dependency graph.
Workarounds
If you can't upgrade right away: gate or disable the affected feature, validate untrusted input at the boundary, and avoid passing attacker-controlled data into the vulnerable path. O3's runtime protection blocks exploitation in production as an interim safeguard until the upgrade lands.
How O3 protects you
O3 Security's impact-aware SCA analyses which vulnerable code paths your application actually calls, so a match like GHSA-6xhv-rxhv-pwm4 can be triaged on real exposure rather than presence alone.
Tailored to GHSA-6xhv-rxhv-pwm4. Runtime protection reduces exposure until a permanent patch is applied and verified — it complements patching, it doesn't replace it.
Frequently Asked Questions
Is GHSA-6xhv-rxhv-pwm4 in your dependencies?
O3 Security finds GHSA-6xhv-rxhv-pwm4 across PyPI dependencies, including transitive ones, and its impact-aware SCA ranks findings by whether your code actually calls the vulnerable path.