GHSA-5PGF-H923-M958
Vulnerability from github – Published: 2026-03-24 16:59 – Updated: 2026-03-25 21:00Summary
An unauthenticated user can call assets/generate-transform with a private assetId, receive a valid transform URL, and fetch transformed image bytes.
The endpoint is anonymous and does not enforce per-asset authorization before returning the transform URL.
Details
Root cause: - Anonymous endpoint accepts user-controlled asset reference. - It creates and returns a transform URL for that asset without checking access rights. - If the transform output is reachable, guest users can read content derived from private assets.
Who is impacted:
- Installations where private source assets can be transformed and transform URLs are reachable.
Security consequence:
- Anonymous users can obtain content derived from private assets without authentication.
Resources
https://github.com/craftcms/cms/commit/7290d91639e
{
"affected": [
{
"database_specific": {
"last_known_affected_version_range": "\u003c= 5.9.13"
},
"package": {
"ecosystem": "Packagist",
"name": "craftcms/cms"
},
"ranges": [
{
"events": [
{
"introduced": "5.0.0-RC1"
},
{
"fixed": "5.9.14"
}
],
"type": "ECOSYSTEM"
}
]
},
{
"database_specific": {
"last_known_affected_version_range": "\u003c= 4.17.7"
},
"package": {
"ecosystem": "Packagist",
"name": "craftcms/cms"
},
"ranges": [
{
"events": [
{
"introduced": "4.0.0-RC1"
},
{
"fixed": "4.17.8"
}
],
"type": "ECOSYSTEM"
}
]
}
],
"aliases": [
"CVE-2026-33160"
],
"database_specific": {
"cwe_ids": [
"CWE-639",
"CWE-862"
],
"github_reviewed": true,
"github_reviewed_at": "2026-03-24T16:59:58Z",
"nvd_published_at": "2026-03-24T18:16:10Z",
"severity": "LOW"
},
"details": "### Summary\n\nAn unauthenticated user can call `assets/generate-transform` with a private `assetId`, receive a valid transform URL, and fetch transformed image bytes.\n\nThe endpoint is anonymous and does not enforce per-asset authorization before returning the transform URL.\n\n### Details\n\nRoot cause:\n- Anonymous endpoint accepts user-controlled asset reference.\n- It creates and returns a transform URL for that asset without checking access rights.\n- If the transform output is reachable, guest users can read content derived from private assets.\n\nWho is impacted:\n\n- Installations where private source assets can be transformed and transform URLs are reachable.\n\nSecurity consequence:\n\n - Anonymous users can obtain content derived from private assets without authentication.\n\n### Resources\n\nhttps://github.com/craftcms/cms/commit/7290d91639e",
"id": "GHSA-5pgf-h923-m958",
"modified": "2026-03-25T21:00:12Z",
"published": "2026-03-24T16:59:58Z",
"references": [
{
"type": "WEB",
"url": "https://github.com/craftcms/cms/security/advisories/GHSA-5pgf-h923-m958"
},
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-33160"
},
{
"type": "WEB",
"url": "https://github.com/craftcms/cms/commit/7290d91639e5e3a4f7e221dfbef95c9b77331860"
},
{
"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"
}
],
"schema_version": "1.4.0",
"severity": [
{
"score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N/E:U",
"type": "CVSS_V4"
}
],
"summary": "Craft CMS may expose private assets through anonymous \"generate transform\" calls via transform URL"
}
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