CVE-2026-58200
HighCVSS 7.1Exploitation Probability (EPSS)
Low risk22th percentile - higher than 22% of all known CVEs
Summary
The @jhb.software/payload-cloudinary-plugin from 0.3.0 until 0.4.0, with clientUploads enabled, exposes POST /api/cloudinary-generate-signature, which passes attacker-controlled parameters directly to Cloudinary's signing function without any restrictions. Any authenticated Payload user can obtain a valid HMAC-SHA1 signature for unauthorized parameters such as overwrite, type, notification_url, invalidate, folder, and public_id.
Risk Assessment
The signature can authorize asset replacement, upload visibility changes, callbacks to attacker-selected URLs, cache invalidation, and uploads outside the intended folder. This leads to unauthorized modification and disclosure of Cloudinary assets.
Recommendation
Upgrade the plugin to version 0.4.0 or later. Until then, consider disabling clientUploads or restricting access to the signature generation endpoint.
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Original NVD description (English source)
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.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS

