Publish GHSA-xxpx-f366-4xpq

Author: advisory-database[bot]

advisories/github-reviewed/2026/08/GHSA-xxpx-f366-4xpq/GHSA-xxpx-f366-4xpq.json

@@ -0,0 +1,67 @@
+{
+  "schema_version": "1.4.0",
+  "id": "GHSA-xxpx-f366-4xpq",
+  "modified": "2026-08-06T21:43:54Z",
+  "published": "2026-08-06T21:43:54Z",
+  "aliases": [],
+  "summary": "Craft CMS:Authorization bypass: view-only Categories user can modify category structure via structures/move-element",
+  "details": "A control-panel user who holds only the viewCategories permission for a category group (and not saveCategories) can permanently modify that group's category structure — reordering and re-parenting categories via the structures/move-element action.\n\nA read-time authorization grant that a write endpoint later trusts. For categories, the structureEditable flag is computed from the view permission (`src/elements/Category.php:205`) instead of the save permission (entries correctly use saveEntries — `src/elements/Entry.php:341`). When the read-only category index renders, `craft\\base\\Element::indexHtml()` calls `Craft::$app->getSession()->authorize('editStructure:<structureId>');` StructuresController then authorizes the structure-mutating action solely on that session grant, with no canSave re-check.\n\nVerified on Craft CMS 5.10.5. Same class as the moderate-severity authorization bypasses fixed in 5.10.3 and 5.10.5; this is a distinct, unpatched instance.\n\n## Impact\n\nA low-privileged, authenticated user (view-only on a category group) can persistently alter the sibling ordering and parent/child nesting of the category taxonomy. Because a category’s URI is derived from its position in the structure (ancestor slugs), moving a category changes its URL and the URLs of its descendants, and can corrupt any navigation/menus built from the category tree. This is an integrity/broken access-control issue: content that the user has no permission to modify is being modified. No confidentiality impact and no RCE; scope is content/taxonomy integrity.",
+  "severity": [
+    {
+      "type": "CVSS_V3",
+      "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N"
+    }
+  ],
+  "affected": [
+    {
+      "package": {
+        "ecosystem": "Packagist",
+        "name": "craftcms/cms"
+      },
+      "ranges": [
+        {
+          "type": "ECOSYSTEM",
+          "events": [
+            {
+              "introduced": "5.0.0-RC1"
+            },
+            {
+              "fixed": "5.10.6"
+            }
+          ]
+        }
+      ]
+    }
+  ],
+  "references": [
+    {
+      "type": "WEB",
+      "url": "https://github.com/craftcms/cms/security/advisories/GHSA-xxpx-f366-4xpq"
+    },
+    {
+      "type": "WEB",
+      "url": "https://github.com/craftcms/cms/commit/eb63721b8476ef53f21d7de53d156eef531cb57d"
+    },
+    {
+      "type": "PACKAGE",
+      "url": "https://github.com/craftcms/cms"
+    },
+    {
+      "type": "WEB",
+      "url": "https://github.com/craftcms/cms/releases/tag/4.18.2"
+    },
+    {
+      "type": "WEB",
+      "url": "https://github.com/craftcms/cms/releases/tag/5.10.6"
+    }
+  ],
+  "database_specific": {
+    "cwe_ids": [
+      "CWE-863"
+    ],
+    "severity": "MODERATE",
+    "github_reviewed": true,
+    "github_reviewed_at": "2026-08-06T21:43:54Z",
+    "nvd_published_at": null
+  }
+}