Publish GHSA-7pfv-hr63-h7cw

Author: advisory-database[bot]

advisories/github-reviewed/2026/03/GHSA-7pfv-hr63-h7cw/GHSA-7pfv-hr63-h7cw.json

@@ -0,0 +1,65 @@
+{
+  "schema_version": "1.4.0",
+  "id": "GHSA-7pfv-hr63-h7cw",
+  "modified": "2026-03-09T19:45:20Z",
+  "published": "2026-03-09T19:45:20Z",
+  "aliases": [
+    "CVE-2026-30927"
+  ],
+  "summary": "Admidio: Event participation IDOR - non-leaders can register other users for events via user_uuid parameter",
+  "details": "## Vulnerability\n\nIn `modules/events/events_function.php`, the event participation logic allows any user who can participate in an event to register OTHER users by manipulating the `user_uuid` GET parameter.\n\nLine 47: `$getUserUuid = admFuncVariableIsValid($_GET, 'user_uuid', 'uuid', ...)`\nLine 424: `if ($event->possibleToParticipate() || $participants->isLeader($gCurrentUserId))`\n\nThe condition uses `||` (OR), meaning if `possibleToParticipate()` returns true (event is open for participation), ANY user - not just leaders - can specify a different `user_uuid` and register/cancel participation for that user.\n\nThe code then operates on `$user->getValue('usr_id')` (the target user from user_uuid) rather than the current user.\n\n## Impact\n- Register unwilling users for events (potential harassment/spam)\n- Cancel other users' event participation\n- Manipulate event participant counts and comments\n- If events have participation limits, fill slots with unwanted registrations\n\n## Fix\nFor non-leader users, force `user_uuid` to the current user:\n```php\nif (!$participants->isLeader($gCurrentUserId)) {\n    $getUserUuid = $gCurrentUser->getValue('usr_uuid');\n}\n```",
+  "severity": [
+    {
+      "type": "CVSS_V4",
+      "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/VA:L/SC:N/SI:N/SA:N"
+    }
+  ],
+  "affected": [
+    {
+      "package": {
+        "ecosystem": "Packagist",
+        "name": "admidio/admidio"
+      },
+      "ranges": [
+        {
+          "type": "ECOSYSTEM",
+          "events": [
+            {
+              "introduced": "0"
+            },
+            {
+              "fixed": "5.0.6"
+            }
+          ]
+        }
+      ]
+    }
+  ],
+  "references": [
+    {
+      "type": "WEB",
+      "url": "https://github.com/Admidio/admidio/security/advisories/GHSA-7pfv-hr63-h7cw"
+    },
+    {
+      "type": "WEB",
+      "url": "https://github.com/Admidio/admidio/issues/1985"
+    },
+    {
+      "type": "WEB",
+      "url": "https://github.com/Admidio/admidio/commit/e47f70cc3cbcdb39635fdbaaef02d19f604b8c3e"
+    },
+    {
+      "type": "PACKAGE",
+      "url": "https://github.com/Admidio/admidio"
+    }
+  ],
+  "database_specific": {
+    "cwe_ids": [
+      "CWE-639"
+    ],
+    "severity": "MODERATE",
+    "github_reviewed": true,
+    "github_reviewed_at": "2026-03-09T19:45:20Z",
+    "nvd_published_at": null
+  }
+}