Auth bypass in Studiocms
CVE-2026-32638
StudioCMS is a server-side-rendered, Astro native, headless content management system. Prior to 0.4.4, the REST API `getUsers` endpoint in StudioCMS uses the attacker-controlled `rank` query parameter to decide whether owner accounts should be filtered from the result set. As a result, an admin token can request `rank=owner` and receive owner account records, including IDs, usernames, display names, and email addresses, even though the adjacent `getUser` endpoint correctly blocks admins from viewing owner users. This is an authorization inconsistency inside the same user-management surface. Version 0.4.4 fixes the issue.
Vulnerability class: IDOR (Insecure Direct Object Reference)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 2.7 (Low). Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:L/I:N/A:N.
EPSS exploit prediction
EPSS: 0.004 (29.4th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 29th percentile — 29.4% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.004 · newest: 0.004 · change: +0.000
Affected products
- Studiocms
- Withstudiocms Studiocms — versions < 0.4.4
Weakness classification (CWE)
References
- github.com/withstudiocms/studiocms/security/advisories/GHSA-xvf4-ch4q-2m24 (Exploit, Mitigation, Vendor Advisory)
- github.com/withstudiocms/studiocms/commit/aebe8bcb3618bb07c6753e3f5c982c1fe6ade… (Patch)
- github.com/withstudiocms/studiocms/releases/tag/studiocms@0.4.4 (Product, Release Notes)
Frequently asked questions
- What is CVE-2026-32638?
- CVE-2026-32638 is a low-severity vulnerability in Studiocms, classified under Authorization Bypass Through User-Controlled Key. CVSS score: 2.7/10. Published 2026-03-18.
- How severe is CVE-2026-32638?
- Low severity. CVSS v3 base score is 2.7 out of 10.