LangBot before 4.10.11 Authentication Bypass via Weak Recovery Key

{
  "id": "fd26ad3f36fb4c621f01d10b68002413233e8b9b4537cf52de8b38119dc8130e",
  "url": "https://osv.dev/vulnerability/CVE-2026-90562",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "LangBot before 4.10.11 Authentication Bypass via Weak Recovery Key",
    "summary": "LangBot before 4.10.11 generates password recovery keys with only 24 bits of entropy and applies no rate limiting to the unauthenticated reset-password endpoint. Remote attackers knowing the administrator email can exhaust the keyspace through concurrent requests to reset the admin password and gain account access.",
    "evidence": "osv:CVE-2026-90562",
    "products": [],
    "severity": "critical",
    "structured": {
      "id": "CVE-2026-90562",
      "aliases": [
        "CVE-2026-90562"
      ],
      "metrics": [
        {
          "type": "CVSS_V4",
          "score": "CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/langbot-app/langbot",
              "type": "GIT",
              "events": [
                {
                  "introduced": "a0b7d759ac8bfdd499dcf1f137c6df2fbcb3dd1c"
                },
                {
                  "fixed": "273b8839b91cb74dfd083644efea18849a3fcee1"
                },
                {
                  "fixed": "267232c24f93c515d6fd3f7f81c0676066ab1ab8"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "range": [
                      {
                        "introduced": "4.0.8.1"
                      },
                      {
                        "fixed": "4.10.11"
                      }
                    ],
                    "source": "AFFECTED_FIELD",
                    "strategy": "StandardRange"
                  },
                  {
                    "range": [
                      {
                        "fixed": "267232c24f93c515d6fd3f7f81c0676066ab1ab8"
                      }
                    ],
                    "source": "REFERENCES_COMMIT"
                  }
                ]
              }
            }
          ],
          "versions": [
            "v4.10.10",
            "v4.10.9",
            "v4.10.8",
            "v4.10.7",
            "v4.10.6",
            "v4.10.5",
            "v4.10.4",
            "v4.10.3",
            "v4.10.2",
            "v4.10.1",
            "v4.10.0",
            "v4.10.0-beta.3",
            "v4.10.0-beta.2",
            "v4.9.7",
            "v4.9.6",
            "v4.9.5",
            "v4.9.4",
            "v4.9.3",
            "v4.9.2",
            "v4.9.1",
            "v4.9.0",
            "v4.8.7",
            "v4.8.6",
            "v4.8.5",
            "v4.8.4",
            "v4.8.3",
            "v4.8.2",
            "v4.8.1",
            "v4.8.0",
            "v4.7.2",
            "v4.7.1",
            "v4.7.0",
            "v4.6.5",
            "v4.6.4",
            "v4.6.3",
            "v4.6.2",
            "v4.6.1",
            "v4.6.0",
            "v4.5.4",
            "v4.5.3",
            "v4.5.1b3",
            "v4.5.1b2",
            "v4.5.1b1",
            "v4.5.0",
            "v4.4.2b1",
            "v.4.4.2b1",
            "v4.4.1",
            "v4.4.0",
            "v4.3.9",
            "v4.3.8",
            "v4.3.7",
            "v4.3.7b1",
            "v4.3.6",
            "v4.3.5",
            "v4.3.4",
            "v4.3.3",
            "v4.3.2",
            "v4.3.1",
            "v4.3.0",
            "v4.2.2",
            "v4.3.0.beta2",
            "v4.2.1",
            "v4.2.0",
            "v4.1.2",
            "v4.1.1",
            "v4.1.0",
            "v4.0.9",
            "v4.0.8.1"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-90562.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:32.994320782Z",
      "provider": "osv",
      "references": [
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/90xxx/CVE-2026-90562.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-90562",
        "https://www.vulncheck.com/advisories/langbot-before-4.10.11-authentication-bypass-via-weak-recovery-key",
        "https://github.com/langbot-app/LangBot/issues/2392",
        "https://github.com/langbot-app/LangBot/commit/267232c24f93c515d6fd3f7f81c0676066ab1ab8",
        "https://github.com/langbot-app/LangBot",
        "https://github.com/langbot-app/LangBot/blob/v4.10.2/src/langbot/pkg/api/http/controller/groups/user.py",
        "https://github.com/langbot-app/LangBot/blob/v4.10.2/src/langbot/pkg/core/stages/genkeys.py"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-331"
        ],
        "cna_assigner": "VulnCheck",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/90xxx/CVE-2026-90562.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-90562",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 500042,
  "published_at": "2026-09-13T10:45:36.684+00:00"
}