How severe is CVE-2026-59222?

No CVSS score has been assigned to CVE-2026-59222 yet. Review the advisory details and affected package list to assess your exposure.

Which packages are affected by CVE-2026-59222?

CVE-2026-59222 affects the following packages: open-webui (PyPI). Ecosystems affected: PyPI.

How do I fix CVE-2026-59222?

Update open-webui to 0.10.0 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2026-59222 is resolved across your whole dependency graph.

How do I detect CVE-2026-59222 in my PyPI dependencies?

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.

How do I mitigate CVE-2026-59222 if there is no patch (or I can't update yet)?

Assume what was exposed is already known: rotate any credential, token or key that the affected component could return, restrict the endpoint to callers that genuinely need it, and strip sensitive fields from responses and error output at the boundary rather than relying on the client not to read them.

Is CVE-2026-59222 actively exploited in the wild?

No public exploit code has been indexed for CVE-2026-59222 yet. This does not mean the vulnerability cannot be exploited — absence of public exploits does not imply safety. Apply the recommended fix and use O3 Security to monitor your exposure.

What is the EPSS score for CVE-2026-59222?

CVE-2026-59222 has an EPSS (Exploit Prediction Scoring System) score of 0.5%, placing it in the 39th percentile of all CVEs. EPSS is maintained by FIRST.org and estimates the probability that a vulnerability will be exploited in the wild within the next 30 days. This score indicates relatively lower exploitation probability, though the CVSS severity should still guide your patching priority.

What type of vulnerability is CVE-2026-59222?

CVE-2026-59222 is classified as Information Exposure (CWE-200). This weakness type describe the underlying flaw category, which helps determine the potential impact and the right class of mitigation.

When was CVE-2026-59222 published, and has it been updated?

CVE-2026-59222 was published on July 9, 2026 and was last updated on October 21, 2026. Advisory data evolves as severity scores, affected ranges, and exploit intelligence are revised — always check the latest version of the advisory before acting.

🐍 PyPI

Not in CISA KEV

CVE-2026-59222 — open-webui

Fix: open-webui/open-webui@fbcdcf1

CVE-2026-59222 is a Information Exposure vulnerability in open-webui. A fix is available for open-webui — see the affected versions and patch details below.

Open WebUI: /api/v1/channels/{id}/members exposes full user model including sensitive credentials

Also known asGHSA-gh7p-78x6-jw6mPYSEC-2026-3598

Published

Jul 9, 2026

Updated

Oct 21, 2026

Affected

1 pkg

Patched

1 / 1

Exploits

None indexed

Exploitation data as of Oct 22, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

Exploitation Status

Proof-of-concept exploit code exists

CISA’s SSVC triage found public proof-of-concept exploit code for this CVE, though no confirmed active exploitation.

Exploitation and automatability from CISA’s SSVC triage for CVE-2026-59222.

EPSS Exploitation Probability

via FIRST.org ↗

0.5%probability of exploitation in next 30 days

Lower Risk0.00%

Lower risk than most CVEs39th percentile — riskier than 39% of all scored CVEsHighest risk

Probability of exploitation in the next 30 days, from FIRST.org EPSS.

Real-World Exposure

1 pkg affected

🐍open-webui

Real-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

The channel members endpoint serializes and returns full user models for channel participants, including settings objects. A normal user in a DM can retrieve admin-only sensitive configuration such as webhook URLs and tool server key material (settings.ui.toolServers[].key), which is not available via standard user info APIs.

Details

The endpoint GET /api/v1/channels/{id}/members returns the full serialized user model for every member in the channel. In both the DM and non-DM code paths, the handler constructs the response with [UserModelResponse(**user.model_dump(), is_active=...)] and returns it as the users list. Because UserModel (models/users.py) includes a settings object (UserSettings) and arbitrary UI configuration (settings.ui), the endpoint exposes other users' sensitive configuration to any channel participant.

Practically, a regular user who participates in a DM or group can call /api/v1/channels/{id}/members and receive other members' settings, including admin-only details such as webhook notification URLs and tool server configuration, including credential fields like settings.ui.toolServers[].key. These values are not returned by the normal user profile endpoints (e.g., /api/v1/users/{user_id}/info).

PoC

Start a local Open WebUI instance
Log in as admin and in the Admin Panel, go to Settings -> General and check Channels (Beta), then press Save.
Create a low-privilege user in the Users tab
Click on the admin's profile bottom left, Settings and Integrations. Then click the + after Manage Tool Servers to add some tool server with a secret Bearer token (eg. KEY)
Log in as the attacker with the low-privilege account and create a new Direct Message channel with the admin user:

After creating, open DevTools with F12 and go to the Network tab. Then in the DM UI click on the Users icon top right to see the members. In the network tab, this should have triggered a /api/v1/channels/{id}/members request which responds with the settings key including toolServers and key values:

The attacker has now leaked the admin's bearer token for the toolserver they configured.

Impact

Conditions for exploit: channels are enabled and an attacker has a low-privilege account.

Webhook URLs and tool server configurations (including bearer keys) can be exfiltrated from any user.

Original Agent Report

Affected Packages

1 total 1 fixed

Ecosystem	Package	Vulnerable range	Fix
🐍PyPI	`open-webui`	≥ 0.7.0&&< 0.10.0	0.10.0`pip install --upgrade 'open-webui==0.10.0'`

Affected Products

1 product · 1 configurations

Application

open webuiopenwebui

≥ 0.7.0 && < 0.10.0

range

Detection & mitigation playbook

Open-source dependency

Detect
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 0.10.0 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2026-59222 is resolved across your whole dependency graph.
Workarounds
Assume what was exposed is already known: rotate any credential, token or key that the affected component could return, restrict the endpoint to callers that genuinely need it, and strip sensitive fields from responses and error output at the boundary rather than relying on the client not to read them.

Frequently Asked Questions

### Summary The channel members endpoint serializes and returns **full user models** for channel participants, including settings objects. A normal user in a DM can retrieve admin-only sensitive configuration such as webhook URLs and tool server key material (`settings.ui.toolServers[].key`), which is not available via standard user info APIs. ### Details The endpoint GET `/api/v1/channels/{id}/members` returns the full serialized user model for every member in the channel. In both the DM and non-DM code paths, the handler constructs the response with `[UserModelResponse(**user.model_dump()

O3 Security · Impact-Aware SCA

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