Medium
Payload has Insufficient Filename Validation in Client-Upload Signed-URL Endpoints
Type: advisorySources: OSV
Payload is a free and open source headless content management system. Prior to version 3.78.0 in @payloadcms/storage-azure, @payloadcms/storage-gcs, @payloadcms/storage-r2, and @payloadcms/storage-s3, the client-upload signed-URL endpoints for S3, GCS, Azure, and R2 did not properly sanitize filenames. An attacker could craft filenames to escape the intended storage location. This issue has been patched in version 3.78.0 for @payloadcms/storage-azure, @payloadcms/storage-gcs, @payloadcms/storage-r2, and @payloadcms/storage-s3.
- Products
- Not specified
- Affected versions
- Not specified
- Fixed versions
- Not specified
- CVEs
- CVE-2026-34750
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 3 Nov 2026, 07:36 UTC · Revision 1
Source evidence
Payload has Insufficient Filename Validation in Client-Upload Signed-URL Endpoints
core-osv · Original sourcePublished 1 Apr 2026, 19:51 UTC
Payload is a free and open source headless content management system. Prior to version 3.78.0 in @payloadcms/storage-azure, @payloadcms/storage-gcs, @payloadcms/storage-r2, and @payloadcms/storage-s3, the client-upload signed-URL endpoints for S3, GCS, Azure, and R2 did not properly sanitize filenames. An attacker could craft filenames to escape the intended storage location. This issue has been patched in version 3.78.0 for @payloadcms/storage-azure, @payloadcms/storage-gcs, @payloadcms/storage-r2, and @payloadcms/storage-s3.
osv:CVE-2026-34750
Complete source record
{
"id": "2c94d3a77fa80611b593c0106bb0c560d936aff59010256b2ff53b4b95c94dc1",
"url": "https://osv.dev/vulnerability/CVE-2026-34750",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "Payload has Insufficient Filename Validation in Client-Upload Signed-URL Endpoints",
"summary": "Payload is a free and open source headless content management system. Prior to version 3.78.0 in @payloadcms/storage-azure, @payloadcms/storage-gcs, @payloadcms/storage-r2, and @payloadcms/storage-s3, the client-upload signed-URL endpoints for S3, GCS, Azure, and R2 did not properly sanitize filenames. An attacker could craft filenames to escape the intended storage location. This issue has been patched in version 3.78.0 for @payloadcms/storage-azure, @payloadcms/storage-gcs, @payloadcms/storage-r2, and @payloadcms/storage-s3.",
"evidence": "osv:CVE-2026-34750",
"products": [],
"severity": "medium",
"structured": {
"id": "CVE-2026-34750",
"aliases": [
"CVE-2026-34750",
"GHSA-frq9-7j6g-v74x"
],
"metrics": [
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N"
}
],
"affected": [
{
"ranges": [
{
"repo": "https://github.com/payloadcms/payload",
"type": "GIT",
"events": [
{
"introduced": "0"
},
{
"fixed": "05e818e3d19f289031e4edc4cfd8d09e166247af"
}
],
"database_specific": {
"extracted_events": [
{
"range": [
{
"introduced": "0"
},
{
"fixed": "3.78.0"
}
],
"source": "AFFECTED_FIELD",
"strategy": "StringRangeExpression"
},
{
"cpe": "cpe:2.3:a:payloadcms:payload:*:*:*:*:*:node.js:*:*",
"range": [
{
"introduced": "0"
},
{
"fixed": "3.78.0"
}
],
"source": "CPE_RANGE"
}
]
}
}
],
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"database_specific": {
"source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-34750.json"
}
}
],
"modified": "2026-10-28T02:30:26.599976697Z",
"provider": "osv",
"references": [
"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/34xxx/CVE-2026-34750.json",
"https://github.com/payloadcms/payload/security/advisories/GHSA-frq9-7j6g-v74x",
"https://nvd.nist.gov/vuln/detail/CVE-2026-34750"
],
"provider_metadata": {
"cwe_ids": [
"CWE-22"
],
"cna_assigner": "GitHub_M",
"osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/34xxx/CVE-2026-34750.json"
}
},
"related_cves": [
{
"value": "CVE-2026-34750",
"evidence": "/id"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 493437,
"published_at": "2026-04-01T19:51:59.689+00:00"
}