Open WebUI: Sign-in as another user via wildcard characters in the OAuth subject claim on SQLite

{
  "id": "9e36e79a1d2144b0b27df5aca38f92a7cfc6e3e9e3ec0e82b653ad1d1aba5a6c",
  "url": "https://osv.dev/vulnerability/CVE-2026-87016",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "Open WebUI: Sign-in as another user via wildcard characters in the OAuth subject claim on SQLite",
    "summary": "Open WebUI is an extensible, feature-rich, and user-friendly self-hosted AI platform. From 0.6.41 until 0.11.1, get_user_by_oauth_sub and get_user_by_scim_external_id in backend/open_webui/models/users.py used JSON contains matching that compiled to SQL LIKE substring matching on SQLite. An OAuth subject containing percent or underscore wildcard characters could resolve to a different stored identity, potentially selecting an administrator account and issuing the attacker that account's session; PostgreSQL deployments were not affected. This issue is fixed in version 0.11.1.",
    "evidence": "osv:CVE-2026-87016",
    "products": [],
    "severity": "high",
    "structured": {
      "id": "CVE-2026-87016",
      "aliases": [
        "CVE-2026-87016",
        "GHSA-wpmr-8h3q-fwj7",
        "PYSEC-2026-4128"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/open-webui/open-webui",
              "type": "GIT",
              "events": [
                {
                  "introduced": "6f1486ffd0cb288d0e21f41845361924e0d742b3"
                },
                {
                  "fixed": "d3e8bf3405e848cfba377814d0aa7ba7290e414d"
                },
                {
                  "fixed": "73c1f5806aeb6345dad5de8f5aa26d1f3d0bef80"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "cpe": "cpe:2.3:a:openwebui:open_webui:*:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "0.6.41"
                      },
                      {
                        "fixed": "0.11.1"
                      }
                    ],
                    "source": "CPE_RANGE"
                  },
                  {
                    "range": [
                      {
                        "fixed": "73c1f5806aeb6345dad5de8f5aa26d1f3d0bef80"
                      }
                    ],
                    "source": "REFERENCES_COMMIT"
                  },
                  {
                    "range": [
                      {
                        "fixed": "d3e8bf3405e848cfba377814d0aa7ba7290e414d"
                      }
                    ],
                    "source": "REFERENCES_TAG",
                    "original_tag": "v0.11.1"
                  }
                ]
              }
            }
          ],
          "versions": [
            "v0.11.0",
            "v0.10.2",
            "v0.10.1",
            "v0.10.0",
            "v0.9.5",
            "v0.9.4",
            "v0.9.3",
            "v0.9.2",
            "v0.9.1",
            "v0.9.0",
            "v0.8.12",
            "v0.8.11",
            "v0.8.10",
            "v0.8.9",
            "v0.8.8",
            "v0.8.7",
            "v0.8.6",
            "v0.8.5",
            "v0.8.4",
            "v0.8.3",
            "v0.8.2",
            "v0.8.1",
            "v0.8.0",
            "v0.7.2",
            "v0.7.1",
            "v0.7.0",
            "v0.6.43",
            "v0.6.42",
            "v0.6.41"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-87016.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:23.364587293Z",
      "provider": "osv",
      "references": [
        "https://github.com/open-webui/open-webui/releases/tag/v0.11.1",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/87xxx/CVE-2026-87016.json",
        "https://github.com/open-webui/open-webui/security/advisories/GHSA-wpmr-8h3q-fwj7",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-87016",
        "https://github.com/open-webui/open-webui/commit/73c1f5806aeb6345dad5de8f5aa26d1f3d0bef80",
        "https://github.com/open-webui/open-webui/pull/28624"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-155",
          "CWE-287"
        ],
        "cna_assigner": "GitHub_M",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/87xxx/CVE-2026-87016.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-87016",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 489508,
  "published_at": "2026-09-09T21:21:43.877+00:00"
}