Vulnerability in open-webui (CVE-2026-70483)
Summary
Vulnerability in open-webui (CVE-2026-70483). Risk of unauthorized operations or information disclosure. Exploitable via DELETE /api/v1/chats/{id}. Mitigation: upgrade to 0.11.0 or later.
Original description
The description as published by the source.
Summary
DELETE /api/v1/chats/{id} cancelled a chat's in-flight tasks before it checked whether the caller was allowed to delete that chat. Any authenticated user who knew another user's chat id could therefore abort that user's running model response, title generation or tag generation. The deletion itself was still refused, so the only missing control was on the cancellation side effect.
Preconditions
Default configuration, no special deployment shape. The attacker needs a normal account with the default user role and nothing else: the chat.delete permission is not required, and revoking it does not prevent the cancellation. The attacker also needs the victim's chat id, which is returned by the read-only shared-chat endpoint when a chat or a folder has been shared with them - otherwise enumerating the chat id requires guessing the chat id or brute forcing it, and the victim must have a generation running at that moment.
Impact
A user can repeatedly interrupt another user's generations without any write access to the target chat. Nothing is deleted, modified or disclosed, and the victim can simply regenerate, so the effect is limited to availability of in-flight responses. Because the attacker only needs a chat id, the interruption can be scripted and repeated for as long as the id stays valid.
Fix
Fixed in https://github.com/open-webui/open-webui/pull/27006, released in 0.11.0. The handler now resolves and authorizes the chat first and only cancels tasks…
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-2026-70483 has been found in open-webui.
Attackers can target a specific entry point like DELETE /api/v1/chats/{id} over the network to misuse the product.
Risk of unauthorized operations or information disclosure. CVSS score: 3.1/10.
What to do: upgrade open-webui to 0.11.0 or later.
If unsure, ask your IT team or search "open-webui CVE-2026-70483" on the vendor's site.
CVE-2026-70483 (open-webui) — CWE-862 / CVSS v3 3.1
Attack vector: remote (network-reachable) / no user interaction
Attack surface: DELETE /api/v1/chats/{id} / GET /api/tasks/chat/{chat_id} / GET /api/v1/chats/{chat_id} / DELETE /api/v1/chats/{chat_id}
Patched: 0.11.0 — 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 DELETE /api/v1/chats/{id}.
Check the vendor advisory for the affected versions of open-webui. Attack surface: DELETE /api/v1/chats/{id} / GET /api/tasks/chat/{chat_id} / GET /api/v1/chats/{chat_id} / DELETE /api/v1/chats/{chat_id}.
Severity: Low (CVSS 3.1/10). Risk of unauthorized operations or information disclosure.
Update to 0.11.0.
Until the patch is applied: disable the affected feature, apply WAF rules, or restrict access via network ACLs.
Search webserver/proxy logs for unusual DELETE /api/v1/chats/{id} 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 'DELETE /api/v1/chats/{id}' /var/log/nginx/access.log | grep -E '(unusual_payload|sqli_pattern)'アクセスログで
DELETE /api/v1/chats/{id}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 0.11.0ステージング環境で 0.11.0 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 DELETE /api/v1/chats/{id} 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 github.com
- advisory nvd.nist.gov
- package github.com
- package pypi.org
- web github.com
- web github.com
- web github.com
- web github.com