Vulnerability in open-webui (CVE-2026-45667)
Summary
Vulnerability in open-webui (CVE-2026-45667). Risk of unauthorized operations or information disclosure. Exploitable via Authorization header. Mitigation: upgrade to 0.8.0 or later.
Original description
The description as published by the source.
Summary
GET /api/v1/memories/ef is accessible without authentication and executes request.app.state.EMBEDDING_FUNCTION(...). This allows any unauthenticated caller to trigger embedding generation which can lead to direct cost exposure if a paid provider is used.
Code reference: backend/open_webui/routers/memories.py (@router.get("/ef") -> calls request.app.state.EMBEDDING_FUNCTION("hello world")).
Details
GET /api/v1/memories/ef is reachable without authentication and triggers request.app.state.EMBEDDING_FUNCTION("hello world"). This crosses an intended security boundary by allowing unauthenticated users to invoke potentially expensive embedding computation and/or paid upstream embedding APIs.
PoC
- Start Open WebUI in default configuration (no special env hardening; default ENABLE_MEMORIES is true).
- From an unauthenticated client (no cookies/Authorization header), call:
curl -i http://:/api/v1/memories/ef
3. Observe the server performs embedding generation and returns a response like:- HTTP 200 with JSON containing the result.
How it can be abused / attacker actions:
- Send repeated requests to
/api/v1/memories/efto:- consume CPU/GPU resources (DoS)
- generate sustained outbound usage to embedding providers if configured (cost + rate-limit exhaustion)
- degrade latency/availability for legitimate users
Impact
If embeddings are configured to use paid/remote providers (OpenAI/Azure/etc), an attacker can generate unli…
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-2026-45667 has been found in open-webui.
Attackers can target a specific entry point like Authorization header over the network to misuse the product.
Risk of unauthorized operations or information disclosure. CVSS score: 6.5/10.
What to do: upgrade open-webui to 0.8.0 or later.
If unsure, ask your IT team or search "open-webui CVE-2026-45667" on the vendor's site.
CVE-2026-45667 (open-webui) — CWE-862 / CVSS v3 6.5
Attack vector: remote (network-reachable) / unauthenticated / no user interaction
Attack surface: Authorization header
Patched: 0.8.0 — 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 Authorization header without authentication.
Check the vendor advisory for the affected versions of open-webui. Attack surface: Authorization header.
Severity: Medium (CVSS 6.5/10). Risk of unauthorized operations or information disclosure.
Update to 0.8.0.
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 0.8.0ステージング環境で 0.8.0 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
- package github.com
- web github.com
- web github.com
- web github.com
- web github.com