EUVD-2026-78825Severity by source
AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:L
Primary rating from Vendor (GitHub_M) · only source for this CVE.
CVSS VectorVendor: GitHub_M
Lifecycle Timeline
5DescriptionCVE.org
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.
AnalysisAI
Any authenticated user of a Payload CMS instance running @jhb.software/payload-cloudinary-plugin (0.3.0 through 0.3.x, fixed in 0.4.0) can obtain a cryptographically valid Cloudinary HMAC-SHA1 upload signature for parameters of their choosing, because the client-upload signing endpoint POST /api/cloudinary-generate-signature forwards attacker-controlled 'paramsToSign' straight to cloudinary.utils.api_sign_request() with no key allowlist, folder policy, or timestamp check. With that signature plus the intentionally client-visible Cloudinary API key, an attacker can overwrite existing assets, flip upload visibility with type=private, register notification_url callbacks to attacker-chosen hosts, force cache invalidation, and write files outside the intended upload folder. …
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