What’s Vulnerable › Vulnerabilities
CVE-2026-32101: StudioCMS S3 Storage Manager Authorization Bypass via Missing `await` on Async Auth Check
- Severity: medium (CVSS 6.3 v3.1)
- Exploited in the wild: not listed in CISA KEV
- EPSS: 0.2% probability of exploitation in the next 30 days
- Public exploit or detection template: yes
- Published: 2026-03-11 · updated 2026-06-17
- Weakness: CWE-863
Description
StudioCMS is a server-side-rendered, Astro native, headless content management system. Prior to 0.3.1, the S3 storage manager's isAuthorized() function is declared async (returns Promise<boolean>) but is called without await in both the POST and PUT handlers. Since a Promise object is always truthy in JavaScript, !isAuthorized(type) always evaluates to false, completely bypassing the authorization check. Any authenticated user with the lowest visitor role can upload, delete, rename, and list all files in the S3 bucket. This vulnerability is fixed in 0.3.1.
Affected products
- withstudiocms studiocms: before 0.3.1 — fixed in 0.3.1
How to fix
Upgrade to a fixed version: withstudiocms studiocms 0.3.1. Check the vendor advisory for mitigations.
References
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