CVE-2026-50280: Craft CMS Authorization Bypass Vulnerability

{
  "schema_version" : "1.4.0",
  "id" : "GHSA-43cq-c2gq-pfpw",
  "modified" : "2026-07-02T18:47:37Z",
  "published" : "2026-07-02T18:47:37Z",
  "aliases" : [ "CVE-2026-50280" ],
  "summary" : "Craft CMS: Authorization bypass in `entries/move-to-section` via missing target-section save check",
  "details" : "### Summary\n\nThe `EntriesController::actionMoveToSection()` endpoint checks only whether the current user can view the destination section, but it does not require permission to save entries into that section. A low-privileged authenticated control-panel user who can move an entry out of its current section can therefore move that entry into a different section where they have read access but no write access.\n\n### Details\n\nThe vulnerable route is implemented in [EntriesController.php](/D:/files/projects/cms-5.9.19/cms-5.9.19/src/controllers/EntriesController.php):465:\n\nThe destination check is only `viewEntries:$section->uid` . The source-entry gate is `Entry::canMove()`, which verifies whether the user can move the existing entry based on the source section:\n\nThis closes the exploit chain:\n\n1. External source: authenticated CP request to `entries/move-to-section`.\n2. Missing authorization check: destination section requires only `viewEntries`, not `saveEntries`.\n3. Privileged sink: `moveEntryToSection()` rewrites `sectionId` and saves the entry into the unauthorized section.\n\nPreconditions derived from the code:\n\n1. The attacker is authenticated to the control panel.\n2. Entry `345` is movable by the attacker from its current section.\n3. The attacker can satisfy `viewEntries` on destination section `12`.\n4. The attacker does not have `saveEntries:DESTINATION_UID`, which is the missing check that makes the bypass possible.\n\nResult:\n\n1. The controller accepts the request because `viewEntries:$section->uid` passes.\n2. Each source entry passes `canMove()` based on source-section permissions.\n3. `moveEntryToSection()` updates the entry’s `sectionId` and saves it.\n4. The entry is now located in a section where the attacker did not have write permission.\n\n### Impact\n\nThis breaks the intended section-level authorization model. A user with limited content permissions can inject or relocate content into a protected section, interfering with editorial boundaries, approval workflows, section-specific business logic, and content ownership expectations.",
  "severity" : [ {
    "type" : "CVSS_V4",
    "score" : "CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:H/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" : "5.9.21"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "WEB",
    "url" : "https://github.com/craftcms/cms/security/advisories/GHSA-43cq-c2gq-pfpw"
  }, {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2026-50280"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/craftcms/cms/commit/0a6b916f6367b0162b2eaf2366add67b45fa98ea"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/craftcms/cms"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-284" ],
    "severity" : "MODERATE",
    "github_reviewed" : true,
    "github_reviewed_at" : "2026-07-02T18:47:37Z",
    "nvd_published_at" : "2026-07-02T00:16:44Z"
  }
}