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CVE-2026-45399
high
CVSS 7.1
Vulnerability in open-webui (CVE-2026-45399)
Summary
vulnerability in open-webui (CVE-2026-45399). Risk of unauthorized operations or information disclosure. Exploitable via `GET /api/tasks`. Mitigation: upgrade to `0.9.0` or later.
AI summary snake-internal / snake-material-v2
A vulnerability tracked as **CVE-2026-45399** has been found in open-webui.
Attackers can target a specific entry point like `GET /api/tasks` over the network to misuse the product.
Risk of unauthorized operations or information disclosure. CVSS score: 7.1/10.
What to do: upgrade open-webui to **0.9.0** or later.
If unsure, ask your IT team or search "open-webui CVE-2026-45399" on the vendor's site.
CVE-2026-45399 (open-webui) — CWE-862 / CVSS v3 7.1
Attack vector: remote (network-reachable) / no user interaction
Attack surface: GET /api/tasks / POST /api/tasks/stop/{task_id} / GET /api/tasks/chat/{chat_id} / POST /api/tasks/chat/{chat_id}/stop
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.
❓ What is the problem
**A vulnerability** (CWE-862) exists in open-webui. Attackers reach the vulnerable code path via `GET /api/tasks` without authentication.
📍 Affected scope
open-webui — . Attack surface: GET /api/tasks / POST /api/tasks/stop/{task_id} / GET /api/tasks/chat/{chat_id} / POST /api/tasks/chat/{chat_id}/stop.
🔥 Severity
Severity: High (CVSS 7.1/10). Risk of unauthorized operations or information disclosure
🔧 How to fix
Update to **0.9.0**.
🛡️ Workaround
Until the patch is applied: disable the affected feature, apply WAF rules, or restrict access via network ACLs.
🔍 Detection
Search webserver/proxy logs for unusual `GET /api/tasks` 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 (7 steps)
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。
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3Hunt for indicators of compromise detect
grep 'GET /api/tasks' /var/log/nginx/access.log | grep -E '(unusual_payload|sqli_pattern)'アクセスログで `GET /api/tasks` 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。
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6Apply 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 3 で見つけた異常検知の続報チェックを含めること。
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7Post-deployment verification verify
Replay attack against GET /api/tasks 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 3 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
pip
open-webui
[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0.9.0"}]}]
PyPI
open-webui
[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0.9.0"}]}]
References
- advisory https://nvd.nist.gov/vuln/detail/CVE-2026-45399
- exploit 134c704f-9b21-4f2e-91b3-4a467353bcc0
- package https://github.com/open-webui/open-webui
- web https://github.com/open-webui/open-webui/pull/23454
- web https://github.com/open-webui/open-webui/commit/e7ff4768f8ffe1924b4576381c9e45e8a64350e4
- web https://github.com/open-webui/open-webui/releases/tag/v0.9.0
- web https://github.com/advisories/GHSA-8jjp-r2w2-4v22