CVE-2026-30920: @oneuptime/common OneUptime Has Broken Access Control Vulnerability

{
  "schema_version" : "1.4.0",
  "id" : "GHSA-656w-6f6c-m9r6",
  "modified" : "2026-03-10T18:44:14Z",
  "published" : "2026-03-09T17:29:47Z",
  "aliases" : [ "CVE-2026-30920" ],
  "summary" : "OneUptime has broken access control in GitHub App installation flow that allows unauthorized project binding",
  "details" : "### Summary\n\nOneUptime's GitHub App callback trusts attacker-controlled `state` and `installation_id` values and updates `Project.gitHubAppInstallationId` with `isRoot: true` without validating that the caller is authorized for the target project. This allows an attacker to overwrite another project's GitHub App installation binding.\n\nRelated GitHub endpoints also lack effective authorization, so a valid installation ID can be used to enumerate repositories and create `CodeRepository` records in an arbitrary project.\n\n### Details\n\nThe callback decodes unsigned base64 JSON from `state` and uses the embedded `projectId` directly:\n\n- https://github.com/OneUptime/oneuptime/blob/master/Common/Server/API/GitHubAPI.ts#L34-L112\n\nIt then writes the supplied `installation_id` into the target project with root privileges:\n\n```ts\nawait ProjectService.updateOneById({\n  id: new ObjectID(projectId),\n  data: { gitHubAppInstallationId: installationId },\n  props: { isRoot: true },\n});\n```\n\nThe `userId` in `state` is only checked for presence, not authenticity:\n\n- https://github.com/OneUptime/oneuptime/blob/master/Common/Server/API/GitHubAPI.ts#L73-L79\n\nThe install flow also generates `state` as plain base64 JSON, not a signed or session-bound token:\n\n- https://github.com/OneUptime/oneuptime/blob/master/Common/Server/API/GitHubAPI.ts#L127-L165\n\nThe follow-on endpoints are also vulnerable:\n\n- Repository listing: https://github.com/OneUptime/oneuptime/blob/master/Common/Server/API/GitHubAPI.ts#L179-L258\n- Repository connect: https://github.com/OneUptime/oneuptime/blob/master/Common/Server/API/GitHubAPI.ts#L260-L356\n- Middleware allows requests with no token to continue as `Public`: https://github.com/OneUptime/oneuptime/blob/master/Common/Server/Middleware/UserAuthorization.ts#L205-L211\n- Installation tokens are minted from any valid installation ID: https://github.com/OneUptime/oneuptime/blob/master/Common/Server/Utils/CodeRepository/GitHub/GitHub.ts#L347-L425\n\n### PoC\n\nMinimal proof of unauthorized project tampering:\n\n```bash\nSTATE=$(printf '%s' '{\"projectId\":\"<victim-project-uuid>\",\"userId\":\"x\"}' | base64 | tr -d '\\n')\ncurl -isk \"https://<host>/api/github/auth/callback?installation_id=999999999&state=${STATE}\"\n```\n\nExpected result:\n\n- Server returns a `302` redirect to `/dashboard/<victim-project-uuid>/code-repository?installation_id=999999999`\n- The target project's `gitHubAppInstallationId` is overwritten\n\n### Impact\n\n- Unauthorized modification of `Project.gitHubAppInstallationId`\n- Temporary GitHub integration breakage if a bogus installation ID is set\n- Cross-project binding of attacker-controlled GitHub App installations\n- Repository metadata disclosure for a supplied valid installation ID\n- Unauthorized creation of `CodeRepository` records in arbitrary projects",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:H/A:L"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "npm",
      "name" : "@oneuptime/common"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "10.0.19"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "WEB",
    "url" : "https://github.com/OneUptime/oneuptime/security/advisories/GHSA-656w-6f6c-m9r6"
  }, {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2026-30920"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/OneUptime/oneuptime"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/OneUptime/oneuptime/blob/master/Common/Server/API/GitHubAPI.ts#L127-L165"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/OneUptime/oneuptime/blob/master/Common/Server/API/GitHubAPI.ts#L179-L258"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/OneUptime/oneuptime/blob/master/Common/Server/API/GitHubAPI.ts#L260-L356"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/OneUptime/oneuptime/blob/master/Common/Server/API/GitHubAPI.ts#L34-L112"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/OneUptime/oneuptime/blob/master/Common/Server/API/GitHubAPI.ts#L73-L79"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/OneUptime/oneuptime/blob/master/Common/Server/Middleware/UserAuthorization.ts#L205-L211"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/OneUptime/oneuptime/blob/master/Common/Server/Utils/CodeRepository/GitHub/GitHub.ts#L347-L425"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-345", "CWE-639", "CWE-862" ],
    "severity" : "HIGH",
    "github_reviewed" : true,
    "github_reviewed_at" : "2026-03-09T17:29:47Z",
    "nvd_published_at" : "2026-03-10T17:40:16Z"
  }
}