Vulnerability in open-webui (CVE-2026-87015)
Summary
Vulnerability in open-webui (CVE-2026-87015). Confidential information can be exposed externally. Exploitable via Authorization header. Mitigation: upgrade to 0.11.1 or later.
Original description
The description as published by the source.
Summary
When more than one external tool server is reachable in the same request, a tool call to a server configured for bearer authentication can arrive carrying the calling user's Open WebUI session cookies alongside that server's own key. The cookie jar is built per connection, but the callable that performs the request reads it late instead of per connection, so every tool callable built in the same pass sends the cookies belonging to whichever connection was processed last. An administrator who configures a server with its own API key has not chosen to send that server anything else, and the operator of that server receives a live session credential for the user who triggered the call.
Preconditions
At least two external tool servers must be attached to the same request, and at least one of them must be set to session or system OAuth authentication, since no cookie jar is assembled otherwise. The connection using that authentication mode must be the one processed last, which follows the order of the tool servers attached to the request rather than anything the receiving party controls.
A deployment with no tool servers, with only one tool server, or where no attached server uses session or system OAuth authentication, is not affected. Tool servers are not configured by default.
Impact
The operator of a tool server that was configured with only its own API key receives the session token of every user whose tool call reaches it. That token authenticates as t…
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-2026-87015 has been found in open-webui.
Attackers can target a specific entry point like Authorization header over the network to misuse the product.
Confidential information can be exposed externally. CVSS score: 6.8/10.
What to do: upgrade open-webui to 0.11.1 or later.
If unsure, ask your IT team or search "open-webui CVE-2026-87015" on the vendor's site.
CVE-2026-87015 (open-webui) — CWE-201 / CVSS v3 6.8
Attack vector: remote (network-reachable) / unauthenticated
Attack surface: Authorization header / token / oauth_session_id
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-201) 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 / token / oauth_session_id.
Severity: Medium (CVSS 6.8/10). 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
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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