Vulnerabilities in pkg:npm/@payloadcms/storage-gcs

PACKAGE
Advisory Identifier: GHSA-frq9-7j6g-v74x
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Advisory Summary

CVE-2026-34750 is a MODERATE (CVSS 6.5) payload has insufficient filename validation vulnerability (CWE-22: Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')) affecting @payloadcms/storage azure libraries in the npm ecosystem. The issue involves payload has insufficient filename validation in client-upload signed-url endpoints. Remediation is available by upgrading affected packages to version 3.78.0.

1 Known Advisory Record(s)
Package Vulnerability Intelligence

pkg:npm/@payloadcms/storage-gcs

1 Known Advisory Record(s)

Vulnerability advisories affecting package pkg:npm/@payloadcms/storage-gcs. Select an advisory below to view technical details or fixes.

Advisory ID CVE / NVD Severity Summary
GHSA-frq9-7j6g-v74x CVE-2026-34750 MODERATE Payload has Insufficient Filename Validation in Client-Upload Signed-URL Endpoints

CVE-2026-34750 at a Glance

CVE Identifier CVE-2026-34750
GHSA Identifier GHSA-frq9-7j6g-v74x
Severity MODERATE
CVSS v3.1 Base Score 6.5
CWE Classification CWE-22: Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')
Affected Product @payloadcms/storage azure
Package Ecosystem npm
Published Date
Last Updated

Security Impact

CVSS: 6.5

The security impact metrics below are parsed directly from the CVSS v3.1 vector string (CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N).

Attack Vector Network (AV:N)
Attack Complexity Low (AC:L)
Privileges Required Low (PR:L)
User Interaction None (UI:N)
Scope Unchanged (S:U)
Confidentiality None (C:N)
Integrity High (I:H)
Availability None (A:N)

How to Fix CVE-2026-34750

To remediate this vulnerability, upgrade all affected @payloadcms/storage azure dependencies to a patched release. Both direct and transitive dependencies should be checked, as frameworks or security libraries may pull in vulnerable versions transitively.

@payloadcms/storage-azure fixed: 3.78.0 
npm install @payloadcms/storage-azure@3.78.0
@payloadcms/storage-gcs fixed: 3.78.0 
npm install @payloadcms/storage-gcs@3.78.0
@payloadcms/storage-r2 fixed: 3.78.0 
npm install @payloadcms/storage-r2@3.78.0
@payloadcms/storage-s3 fixed: 3.78.0 
npm install @payloadcms/storage-s3@3.78.0
Verify Direct and Transitive Dependencies

Run the following command in your project directory to verify that all resolved dependencies use the patched release: 

npm ls @payloadcms/storage-azure

How to Check if You Are Affected

To determine whether your Node.js application is affected by CVE-2026-34750, inspect your project dependencies using npm:

npm ls @payloadcms/storage-azure

Analyze the terminal output to locate any version of @payloadcms/storage azure in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 3.78.0), your application is affected.

Note: The npm ls @payloadcms/storage-azure command inspects dependencies declared in your package.json and lockfile; it does not perform automated runtime dynamic scanning.

Technical Details

Vulnerability Mechanism & Technical Analysis

This vulnerability is classified under CWE-22: Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal'), where the product uses external input to construct a pathname that is intended to identify a file or directory that is located underneath a restricted parent directory, but the product does not properly neutralize special elements within the pathname that can cause the pathname to resolve to a location that is outside of the restricted directory. In @payloadcms/storage azure, software state validation or input boundaries are circumvented during processing. Review the official source advisory statement below for specific affected components, classes, and reproduction details.

Source Advisory Statement

### Impact 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. Consumers are affected if ALL of these are true: - Payload version **< v3.78.0** - Using client-upload signed-URL endpoints for any supported storage adapter ## Patches This vulnerability has been patched in **v3.78.0**. Filename validation has been hardened for client uploads. Consumers should upgrade to **v3.78.0** or later. ## Workarounds Consumers can upgrade: - Limit access to client-upload signed-URL endpoints to trusted users only.

CVE-2026-34750 Affected @payloadcms/storage azure Versions

4 component(s)
Fixed Versions:
3.78.0
Product / Package Ecosystem Affected Versions Fixed Version
@payloadcms/storage-azure
npm/@payloadcms/storage-azure
npm
< 3.78.0
3.78.0
@payloadcms/storage-gcs
npm/@payloadcms/storage-gcs
npm
< 3.78.0
3.78.0
@payloadcms/storage-r2
npm/@payloadcms/storage-r2
npm
< 3.78.0
3.78.0
@payloadcms/storage-s3
npm/@payloadcms/storage-s3
npm
< 3.78.0
3.78.0

References

GitHub Advisory / Wiki ADVISORY
https://github.com/payloadcms/payload/security/advisories/GHSA-frq9-7j6g-v74x
NVD — CVE-2026-34750 NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-34750
@payloadcms/storage azure Source Repository REPOSITORY
https://github.com/payloadcms/payload

Frequently Asked Questions

What is CVE-2026-34750?
CVE-2026-34750 is a security vulnerability in @payloadcms/storage azure involving Payload has Insufficient Filename Validation in Client-Upload Signed-URL Endpoints under CWE-22: Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal').
Which @payloadcms/storage azure versions are affected?
Affected versions include releases prior to 3.78.0 across affected packages: @payloadcms/storage-azure, @payloadcms/storage-gcs, @payloadcms/storage-r2, @payloadcms/storage-s3.
What version fixes CVE-2026-34750?
Upgrading to 3.78.0 (or the latest patched release for your respective branch) resolves the vulnerability.
Is @payloadcms/storage-azure affected?
Yes, @payloadcms/storage-azure is affected in releases prior to 3.78.0. Upgrade your dependency to 3.78.0 or later.
Is @payloadcms/storage-gcs affected?
Yes, @payloadcms/storage-gcs is affected in releases prior to 3.78.0. Upgrade your dependency to 3.78.0 or later.
What is the CVSS score of CVE-2026-34750?
CVE-2026-34750 has a CVSS v3.1 base score of 6.5 (MODERATE) with vector string CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N.
What CWE is associated with CVE-2026-34750?
CVE-2026-34750 is classified under CWE-22: Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal') (The product uses external input to construct a pathname that is intended to identify a file or directory that is located underneath a restricted parent directory, but the product does not properly neutralize special elements within the pathname that can cause the pathname to resolve to a location that is outside of the restricted directory.).
How can I check npm dependencies for CVE-2026-34750?
Run the dependency tree command: 'npm ls @payloadcms/storage-azure'. This command lists direct and transitive dependencies in your build configuration so you can verify if a vulnerable version is resolved.
Machine-readable OSV JSON OSV v1.5 Schema
Normalized schema output
View Raw JSON 
{
  "schema_version" : "1.4.0",
  "id" : "GHSA-frq9-7j6g-v74x",
  "modified" : "2026-04-01T21:44:09Z",
  "published" : "2026-04-01T21:44:09Z",
  "aliases" : [ "CVE-2026-34750" ],
  "summary" : "Payload has Insufficient Filename Validation in Client-Upload Signed-URL Endpoints",
  "details" : "### Impact\n\nThe 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.\n\nConsumers are affected if ALL of these are true:\n\n- Payload version **< v3.78.0**\n- Using client-upload signed-URL endpoints for any supported storage adapter\n\n  ## Patches\n\nThis vulnerability has been patched in **v3.78.0**. Filename validation has been hardened for client uploads.\n\nConsumers should upgrade to **v3.78.0** or later.\n\n## Workarounds\n\nConsumers can upgrade:\n\n- Limit access to client-upload signed-URL endpoints to trusted users only.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "npm",
      "name" : "@payloadcms/storage-azure"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "3.78.0"
      } ]
    } ]
  }, {
    "package" : {
      "ecosystem" : "npm",
      "name" : "@payloadcms/storage-gcs"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "3.78.0"
      } ]
    } ]
  }, {
    "package" : {
      "ecosystem" : "npm",
      "name" : "@payloadcms/storage-r2"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "3.78.0"
      } ]
    } ]
  }, {
    "package" : {
      "ecosystem" : "npm",
      "name" : "@payloadcms/storage-s3"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "3.78.0"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "WEB",
    "url" : "https://github.com/payloadcms/payload/security/advisories/GHSA-frq9-7j6g-v74x"
  }, {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2026-34750"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/payloadcms/payload"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-22" ],
    "severity" : "MODERATE",
    "github_reviewed" : true,
    "github_reviewed_at" : "2026-04-01T21:44:09Z",
    "nvd_published_at" : "2026-04-01T20:16:27Z"
  }
}