Vulnerability in open-webui (CVE-2026-87996)
Summary
Vulnerability in open-webui (CVE-2026-87996). Confidential information can be exposed externally. Exploitable via PLAYWRIGHT_WS_URL. Mitigation: upgrade to 0.11.1 or later.
Original description
The description as published by the source.
Summary
With the Playwright web loader enabled, Open WebUI checks the address behind a user-submitted URL before allowing the request, then handed the request to the browser to perform. The browser resolved the hostname a second time, on its own, and that answer was never checked. An attacker who controls the authoritative DNS for a hostname they submit can answer the first lookup with a public address and the second with an internal one, so the browser connects to an address the check exists to block. The connection-layer pinning that protects the other fetch paths could not apply here, because the request ran inside the browser rather than through our own HTTP clients.
Preconditions
WEB_LOADER_ENGINE=playwright. This is not the default, and deployments on the default web loader are unaffected.- A reachable Playwright browser, either local or via
PLAYWRIGHT_WS_URL. - Any authenticated user who can submit a URL for ingestion or trigger a web search. No administrator role is required.
- Control of the authoritative DNS for a hostname the attacker submits, serving a short TTL and alternating answers. No timing race is needed, because the two lookups are separate queries the attacker answers differently.
- Internal services the browser process can actually reach. A deployment whose browser has no route to internal addresses loses nothing here.
Impact
An authenticated user can make the server read HTTP responses from addresses only it can reach: cloud instance m…
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-2026-87996 has been found in open-webui.
Attackers can target a specific entry point like PLAYWRIGHT_WS_URL over the network to misuse the product.
Confidential information can be exposed externally. CVSS score: 7.7/10.
What to do: upgrade open-webui to 0.11.1 or later.
If unsure, ask your IT team or search "open-webui CVE-2026-87996" on the vendor's site.
CVE-2026-87996 (open-webui) — CWE-367 / CVSS v3 7.7
Attack vector: remote (network-reachable) / no user interaction
Attack surface: PLAYWRIGHT_WS_URL / SafePlaywrightURLLoader
Patched: 0.11.1 — 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-367) exists in open-webui. Attackers reach the vulnerable code path via PLAYWRIGHT_WS_URL.
Check the vendor advisory for the affected versions of open-webui. Attack surface: PLAYWRIGHT_WS_URL / SafePlaywrightURLLoader.
Severity: High (CVSS 7.7/10). Confidential information can be exposed externally.
Update to 0.11.1.
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 0.11.1ステージング環境で 0.11.1 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
- web github.com