Information Disclosure in open-webui (CVE-2026-59222)
Summary
Vulnerability in open-webui (CVE-2026-59222). Confidential information can be exposed externally. Exploitable via UserModel. Mitigation: upgrade to 0.10.0 or later.
Original description
The description as published by the source.
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…
Source: NIST National Vulnerability Database NVD GitHub Advisory
Auto-generated summary
Assembled by SecPulse from the source data (CVSS, CWE, affected versions) using templates — no AI involved. Check the original description and references below for exact details.
A vulnerability tracked as CVE-2026-59222 has been found in open-webui.
Attackers can target a specific entry point like UserModel over the network to misuse the product.
Confidential information can be exposed externally. CVSS score: 6.5/10.
What to do: upgrade open-webui to 0.10.0 or later.
If unsure, ask your IT team or search "open-webui CVE-2026-59222" on the vendor's site.
CVE-2026-59222 (open-webui) — CWE-200 / CVSS v3 6.5
Attack vector: remote (network-reachable) / no user interaction
Attack surface: UserModel / UserSettings / settings.ui / KEY
Patched: 0.10.0 — apply immediately
Plan: 1) Audit SBOM/dependencies, 2) Stage→prod upgrade, 3) Add WAF/proxy monitoring on affected endpoints, 4) Hunt IOCs in logs.
Refs: see the GHSA / vendor advisory / patched release linked on this page.
Information disclosure (CWE-200) exists in open-webui. Attackers reach the vulnerable code path via UserModel.
Check the vendor advisory for the affected versions of open-webui. Attack surface: UserModel / UserSettings / settings.ui / KEY.
Severity: Medium (CVSS 6.5/10). Confidential information can be exposed externally.
Update to 0.10.0.
Until the patch is applied: disable the affected feature, apply WAF rules, or restrict access via network ACLs.
Search webserver/proxy logs for unusual request patterns matching this CVE's known IOCs. Run grep -r 'open-webui' . against your dependency files (package-lock.json, requirements.txt, go.sum) to find affected services.
Response actions
Concrete steps and command examples for SOC/SRE teams to execute in order
-
1Identify exposure identify
grep -r 'open-webui' . | grep -v node_modulesリポジトリと本番環境の依存ファイル (package-lock.json / requirements.txt / go.sum / Gemfile.lock 等) で
open-webuiを grep し、稼働しているサービス・バージョンを把握する。 -
2Apply patch patch
Upgrade open-webui to 0.10.0ステージング環境で 0.10.0 に上げて回帰テスト → 本番反映。回帰テストはアプリの主要ハッピーパスを含めること。
-
3Post-deployment verification verify
Confirm patched version is live in productionパッチ適用後、ステージングで PoC または同等の悪用パターンを再現して脆弱性が閉じたことを確認。本番ではアクセスログ・WAF でアラート再発が無いか継続監視。
Affected packages
References
- advisory nvd.nist.gov
- advisory github.com
- package github.com
- package pypi.org
- web github.com
- web github.com
- web github.com