Vulnerability in open-webui (CVE-2026-44550)
Summary
Vulnerability in open-webui (CVE-2026-44550). Risk of unauthorized operations or information disclosure. Exploitable via GET /api/v1/users/search. Mitigation: upgrade to 0.9.0 or later.
Original description
The description as published by the source.
Mass Assignment via Pydantic extra='allow' Allows Creating Folders in Other Users' Accounts
Affected Component
Folder creation endpoint and form model:
backend/open_webui/models/folders.py(lines 72-77,FolderFormwithextra='allow')backend/open_webui/models/folders.py(lines 95-106,insert_new_folderdict construction)backend/open_webui/routers/folders.py(line 119,create_folderendpoint)
Affected Versions
Current main branch (commit 6fdd19bf1) and likely all versions since FolderForm adopted extra='allow'.
Description
FolderForm uses model_config = ConfigDict(extra='allow'), which permits arbitrary fields to pass through Pydantic validation and be included in model_dump(exclude_unset=True). In insert_new_folder, the server-assigned user_id is placed at the start of the dict and then overwritten by the spread of form data:
# models/folders.py:95-106
folder = FolderModel(
**{
'id': id, # server
'user_id': user_id, # server — overwritten below
**(form_data.model_dump(exclude_unset=True) or {}), # user-controlled (extra='allow')
'parent_id': parent_id,
'created_at': int(time.time()),
'updated_at': int(time.time()),
}
)
Because FolderModel declares user_id: str as a real field (not just a form extra), any attacker-supplied user_id in the POST body is accepted by the…
Source: GitHub Security Advisories (Global) 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-2026-44550 has been found in open-webui.
Attackers can target a specific entry point like GET /api/v1/users/search over the network to misuse the product.
Risk of unauthorized operations or information disclosure. CVSS score: 5.0/10.
What to do: upgrade open-webui to 0.9.0 or later.
If unsure, ask your IT team or search "open-webui CVE-2026-44550" on the vendor's site.
CVE-2026-44550 (open-webui) — CWE-862 / CVSS v3 5.0
Attack vector: remote (network-reachable) / no user interaction
Attack surface: GET /api/v1/users/search / POST /api/v1/folders/ / GET /api/v1/folders/ / FolderForm
Patched: 0.9.0 — 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.
A vulnerability (CWE-862) exists in open-webui. Attackers reach the vulnerable code path via GET /api/v1/users/search.
Check the vendor advisory for the affected versions of open-webui. Attack surface: GET /api/v1/users/search / POST /api/v1/folders/ / GET /api/v1/folders/ / FolderForm.
Severity: Medium (CVSS 5.0/10). Risk of unauthorized operations or information disclosure.
Update to 0.9.0.
Until the patch is applied: disable the affected feature, apply WAF rules, or restrict access via network ACLs.
Search webserver/proxy logs for unusual GET /api/v1/users/search requests with malformed payloads or SQL meta-characters. 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。 -
2Hunt for indicators of compromise detect
grep 'GET /api/v1/users/search' /var/log/nginx/access.log | grep -E '(unusual_payload|sqli_pattern)'アクセスログで
GET /api/v1/users/searchへの異常なリクエスト (不正な認証ヘッダ・SQLメタ文字)を過去 30〜90日分捜索。WAF/SIEM があれば該当パスのアラート発火履歴を確認。 -
3Apply patch patch
Upgrade open-webui to 0.9.0ステージング環境で 0.9.0 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と、Step 2 で見つけた異常検知の続報チェックを含めること。
-
4Post-deployment verification verify
Replay attack against GET /api/v1/users/search on staging to confirm patch closes the vector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 Step 2 と同じログクエリでアラート再発が無いか継続監視。
Affected packages
References
- advisory nvd.nist.gov
- package github.com
- web github.com
- web github.com