CVE-2026-87011

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Source
https://cve.org/CVERecord?id=CVE-2026-87011
Import Source
https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-87011.json
JSON Data
https://api.osv.dev/v1/vulns/CVE-2026-87011
Aliases
Published
2026-09-09T20:54:26Z
Modified
2026-10-01T17:55:42Z
Severity
  • 7.5 (High) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H CVSS Calculator
Summary
Open WebUI: Unauthenticated requests can stall the server via uncached OIDC fetches in back-channel logout
Details

Open WebUI is an extensible, feature-rich, and user-friendly self-hosted AI platform. From 0.9.0 until 0.11.1, the unauthenticated POST /oauth/backchannel-logout handler in backend/open_webui/utils/oauth.py fetched the OIDC discovery document and signing keys before validating a submitted logout token. Each request repeated uncached network fetches, and the signing-key lookup blocked the async event loop, so requests carrying invalid tokens could stall the single-worker instance and amplify traffic to the identity provider when ENABLE_OAUTH_BACKCHANNEL_LOGOUT was enabled. This issue is fixed in version 0.11.1.

Database specific 
{
    "cna_assigner":  "GitHub_M",
    "cwe_ids":  [
        "CWE-405",
        "CWE-770"
    ],
    "osv_generated_from":  "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/87xxx/CVE-2026-87011.json"
}
References

Affected packages

Git / github.com/open-webui/open-webui

Affected ranges

Type
GIT
Repo
https://github.com/open-webui/open-webui
Events
Introduced
f31768e20e5c6b4f6da0ef657877298b359936cf
Fixed
d3e8bf3405e848cfba377814d0aa7ba7290e414d
Fixed
aeda6ff13a25d3b3ba1b303609f35382db22142c
Database specific
Show details 
{
    "cpe":  "cpe:2.3:a:openwebui:open_webui:*:*:*:*:*:*:*:*",
    "extracted_events":  [
        {
            "introduced":  "0.9.0"
        },
        {
            "fixed":  "0.11.1"
        }
    ],
    "source":  [
        "CPE_RANGE",
        "REFERENCES"
    ]
}

Affected versions

v0.*
v0.10.0
v0.10.1
v0.10.2
v0.11.0
v0.9.0
v0.9.1
v0.9.2
v0.9.3
v0.9.4
v0.9.5

Database specific

source 
"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-87011.json"