CVE-2026-32101 — StudioCMS S3 Storage Manager Authorization Bypass via Missing `await` on Async Auth Check

Description (CNA)

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 (CNA)

Vendor / product	Versions
@studiocms / s3-storage	affected < 0.3.1

CWE

CWE-863

References

https://github.com/withstudiocms/studiocms/security/advisories/GHSA-mm78-fgq8-6pgr

ADP enrichment

CISA-ADP

No English description supplied.

No references supplied.