GHSA-XXPX-F366-4XPQ
Vulnerability from github – Published: 2026-08-06 21:43 – Updated: 2026-09-01 21:18A 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.
A 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::$app->getSession()->authorize('editStructure:<structureId>'); StructuresController then authorizes the structure-mutating action solely on that session grant, with no canSave re-check.
Verified on Craft CMS 5.10.5. Same class as the moderate-severity authorization bypasses fixed in 5.10.3 and 5.10.5; this is a distinct, unpatched instance.
Impact
A low-privileged, authenticated user (view-only on a category group) can persistently alter the sibling ordering and parent/child nesting of the category taxonomy. Because a category’s URI is derived from its position in the structure (ancestor slugs), moving a category changes its URL and the URLs of its descendants, and can corrupt any navigation/menus built from the category tree. This is an integrity/broken access-control issue: content that the user has no permission to modify is being modified. No confidentiality impact and no RCE; scope is content/taxonomy integrity.
{
"affected": [
{
"package": {
"ecosystem": "Packagist",
"name": "craftcms/cms"
},
"ranges": [
{
"events": [
{
"introduced": "5.0.0-RC1"
},
{
"fixed": "5.10.6"
}
],
"type": "ECOSYSTEM"
}
]
}
],
"aliases": [
"CVE-2026-72785"
],
"database_specific": {
"cwe_ids": [
"CWE-863"
],
"github_reviewed": true,
"github_reviewed_at": "2026-08-06T21:43:54Z",
"nvd_published_at": null,
"severity": "MODERATE"
},
"details": "A control-panel user who holds only the viewCategories permission for a category group (and not saveCategories) can permanently modify that group\u0027s category structure \u2014 reordering and re-parenting categories via the structures/move-element action.\n\nA read-time authorization grant that a write endpoint later trusts. For categories, the structureEditable flag is computed from the view permission (`src/elements/Category.php:205`) instead of the save permission (entries correctly use saveEntries \u2014 `src/elements/Entry.php:341`). When the read-only category index renders, `craft\\base\\Element::indexHtml()` calls `Craft::$app-\u003egetSession()-\u003eauthorize(\u0027editStructure:\u003cstructureId\u003e\u0027);` 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\u2019s 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.",
"id": "GHSA-xxpx-f366-4xpq",
"modified": "2026-09-01T21:18:48Z",
"published": "2026-08-06T21:43:54Z",
"references": [
{
"type": "WEB",
"url": "https://github.com/craftcms/cms/security/advisories/GHSA-xxpx-f366-4xpq"
},
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-72785"
},
{
"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"
},
{
"type": "WEB",
"url": "https://www.vulncheck.com/advisories/craft-cms-before-authorization-bypass-via-structures-move-element"
}
],
"schema_version": "1.4.0",
"severity": [
{
"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",
"type": "CVSS_V4"
}
],
"summary": "Craft CMS: Authorization bypass: view-only Categories user can modify category structure via structures/move-element"
}
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
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- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
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