Publish GHSA-6mrr-q3pj-h53w

Author: advisory-database[bot]

advisories/github-reviewed/2026/03/GHSA-6mrr-q3pj-h53w/GHSA-6mrr-q3pj-h53w.json

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+{
+  "schema_version": "1.4.0",
+  "id": "GHSA-6mrr-q3pj-h53w",
+  "modified": "2026-03-24T16:57:17Z",
+  "published": "2026-03-24T16:57:17Z",
+  "aliases": [
+    "CVE-2026-33159"
+  ],
+  "summary": "Craft CMS: Unauthenticated Users Can Perform Restricted Project Config Sync Operations",
+  "details": "### Summary\nGuest users can access Config Sync updater `index`, obtain signed `data`, and execute state-changing Config Sync actions (`regenerate-yaml`, `apply-yaml-changes`) without authentication.\n\n### Details\n\n`ConfigSyncController` extends `BaseUpdaterController`, and the base updater is anonymously accessible for control panel requests.  `index` emits signed updater state (`data`), which can be reused by guests in subsequent requests.\n\nSensitive actions that are reachable via this method are `actionApplyYamlChanges`, `actionRegenerateYaml`, `applyExternalChanges`, and  `regenerateExternalConfig`.\n\n#### Reproduction steps\n\n1. Guest POST to:\n\n    http POST /admin/actions/config-sync/index\n\n  2. Extract data from returned JS state:\n\n    Craft.updater = ... setState({\"data\":\"<signedData>\", ...});\n\n  3. Reuse data as a guest:\n\n```\n  POST /admin/actions/config-sync/regenerate-yaml\n  data=<signedData>&<csrfParam>=<csrfToken>\n```\n\n  or\n\n```\n  POST /admin/actions/config-sync/apply-yaml-changes\n  data=<signedData>&<csrfParam>=<csrfToken>\n```\n\n  4. Observe completed response and state/file changes.\n\n### Impact\n\nUnauthenticated users can execute project configuration sync operations that should be restricted to trusted admin/deployment contexts.\n\nDepending on the pending YAML/config state, this can cause unauthorized config state transitions and a service integrity risk.\n\n### Resources\n\nhttps://github.com/craftcms/cms/commit/7f0ead833f7",
+  "severity": [
+    {
+      "type": "CVSS_V4",
+      "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/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": "5.9.14"
+            }
+          ]
+        }
+      ],
+      "database_specific": {
+        "last_known_affected_version_range": "<= 5.9.13"
+      }
+    },
+    {
+      "package": {
+        "ecosystem": "Packagist",
+        "name": "craftcms/cms"
+      },
+      "ranges": [
+        {
+          "type": "ECOSYSTEM",
+          "events": [
+            {
+              "introduced": "4.0.0-RC1"
+            },
+            {
+              "fixed": "4.17.8"
+            }
+          ]
+        }
+      ],
+      "database_specific": {
+        "last_known_affected_version_range": "<= 4.17.7"
+      }
+    }
+  ],
+  "references": [
+    {
+      "type": "WEB",
+      "url": "https://github.com/craftcms/cms/security/advisories/GHSA-6mrr-q3pj-h53w"
+    },
+    {
+      "type": "WEB",
+      "url": "https://github.com/craftcms/cms/commit/7f0ead833f7c2b91ae12003caad833479dd08592"
+    },
+    {
+      "type": "PACKAGE",
+      "url": "https://github.com/craftcms/cms"
+    },
+    {
+      "type": "WEB",
+      "url": "https://github.com/craftcms/cms/releases/tag/4.17.8"
+    },
+    {
+      "type": "WEB",
+      "url": "https://github.com/craftcms/cms/releases/tag/5.9.14"
+    }
+  ],
+  "database_specific": {
+    "cwe_ids": [
+      "CWE-306",
+      "CWE-862"
+    ],
+    "severity": "MODERATE",
+    "github_reviewed": true,
+    "github_reviewed_at": "2026-03-24T16:57:17Z",
+    "nvd_published_at": null
+  }
+}