CVE-2026-58200 @jhb.software/payload-cloudinary-plugin: Arbitrary Cloudinary API Parameter Signing
Authenticated users can generate valid Cloudinary signatures for unauthorized parameters, allowing asset replacement and unauthorized uploads when clientUploads is enabled.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-58200?
CVE-2026-58200 is a high-severity missing authorization vulnerability in jhb-software payload-plugins, published on 15 Sep 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official 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.
Weakness: CWE-347
Which versions are affected by CVE-2026-58200?
2 open source packages ship an affected version, including @jhb.software/payload-cloudinary-plugin.
| Package | Affected | Fixed in |
|---|---|---|
@jhb.software/payload-cloudinary-plugin npm | From 0.3.0 | 0.4.0 |
@jhb.software/payload-cloudinary-plugin npm | From 0.3.0 | 0.4.0 |
How do I fix CVE-2026-58200?
Upgrade @jhb.software/payload-cloudinary-plugin to 0.4.0 or later.
Upgrade, and check permissions on every request on the server, not only in the interface. More about Missing authorization.
Is CVE-2026-58200 being exploited?
There is no known exploitation of CVE-2026-58200 in the wild and no public exploit code.
Sources
Also known as GHSA-h5x8-xp6m-x6q4.