CVE-2026-58200
@jhb.software/payload-cloudinary-plugin: Arbitrary Cloudinary API Parameter Signing
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.
- Affected
- jhb-software · payload-plugins
- CVSS v3.1 GITHUB
- 7.1 HIGH
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:L - EPSS
- 0.31% chance of exploitation in the next 30 days, 23rd percentile
- Published
- 2026-09-15
Proof-of-concept exploits (2)
- jhb-software/payload-plugins/security/advisories/GHSA-h5x8-xp6m-x6q4
- jhb-software/payload-plugins/pull/155104★ · 2026-10-10