@jhb.software/payload-cloudinary-plugin: Arbitrary Cloudinary API Parameter Signing

Exploitation

No confirmed exploitation recorded. Patch Next marks exploitation only from CISA KEV.

CVSS

7.1 · CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:L

EPSS

• CVE-2026-58200: 0.31% estimated exploitation activity in the next 30 days; percentile 24.38 (FIRST EPSS, 2026-11-03). This is a model estimate, not proof of exploitation or customer exposure.

As published by the source; long descriptions are shortened.

Arbitrary Cloudinary API Parameter Signing in @jhb.software/payload-cloudinary-plugin Summary @jhb.software/payload-cloudinary-plugin v0.3.4 exposes a server-side signing endpoint (POST /api/cloudinary-generate-signature) that passes attacker-supplied paramsToSign directly to cloudinary.utils.apisignrequest() without any allowlist, key filtering, or policy enforcement. Any authenticated Payload user can obtain a cryptographically valid Cloudinary HMAC-SHA1 signature for arbitrary upload parameters — including overwrite=true, type=private, notificationurl, and path-traversal folder values — enabling unauthorized asset replacement, access-control bypass, and potential SSRF within the configured Cloudinary account. Details When clientUploads: true is configured, the plugin registers a signing handler at cloudinary/src/index.ts:74-79. The handler is implemented in cloudinary/src/getGenerateSignature.ts. Vulnerable code path (step by step): 1. cloudinary/src/index.ts:58 —…

Published by the source

19 Jun 2026, 22:10 UTC

Last modified by the source

16 Sep 2026, 03:56 UTC

Source last checked

26 Oct 2026, 12:56 UTC

1. Revision 2 · amended · 26 Oct 2026

   Amended from ghsa record GHSA-h5x8-xp6m-x6q4

2. Revision 1 · created · 24 Oct 2026

   Published from osv record GHSA-h5x8-xp6m-x6q4

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# Patch Next advisory brief: CVE-2026-58200

Advisory: @jhb.software/payload-cloudinary-plugin: Arbitrary Cloudinary API Parameter Signing
IDs: CVE-2026-58200, GHSA-h5x8-xp6m-x6q4
Record: https://patchnext.com/advisories/cve-2026-58200 (revision 2, source checked 26 Oct 2026, 12:56 UTC)
Inventory: none attached. This brief comes from a public page and does not say whether any deployment is affected.
Severity: High (CVSS 7.1)
Exploitation: no confirmed exploitation recorded. Patch Next confirms exploitation only from CISA KEV.
Vendor response: Vendor fix available; fixed versions by package: @jhb.software/payload-cloudinary-plugin 0.4.0. A vendor fix does not mean a deployment is fixed.

## Affected components
- npm @jhb.software/payload-cloudinary-plugin: affected >= 0.3.0, < 0.4.0; fixed in 0.4.0

## Suggested inspection (read-only)
- `npm ls @jhb.software/payload-cloudinary-plugin --all`: lists every installed copy and version, including transitive ones. Run in the project root after `npm ci`.

## Supported action
Upgrade each affected component to a fixed version on its release line. For a transitive dependency, upgrade the parent package or add an override or constraint, then regenerate the lockfile. Redeploy every environment that ran an affected version.

## Required regression checks
- Run the test suite and a production build.
- Exercise the features that depend on @jhb.software/payload-cloudinary-plugin.
- Repeat the inspection and confirm that only fixed versions remain installed.

## Rollback considerations
- Keep the previous lockfile and deployment artifact. Rolling back reinstates the vulnerable version, so apply any documented mitigation while you fix forward.

## Unresolved questions
- Which deployments run an affected version?
- Exploitation status can change. Check again before lowering the priority.
- Mark the work resolved only after the fixed version is verified in production.

## Sources
- Verified: https://osv.dev/vulnerability/GHSA-h5x8-xp6m-x6q4 (OSV record GHSA-h5x8-xp6m-x6q4 lists affected ranges: npm @jhb.software/payload-cloudinary-plugin >=0.3.0 <0.4.0 (fixed))
- Verified: https://github.com/advisories/GHSA-h5x8-xp6m-x6q4 (GitHub-reviewed advisory GHSA-h5x8-xp6m-x6q4 lists affected ranges: npm @jhb.software/payload-cloudinary-plugin >=0.3.0 <0.4.0)

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