Auth bypass in Humansignal Label-Studio
CVE-2026-85211
Label Studio fails to apply organization filters when resolving storage URIs for tasks and projects in proxy_api.py endpoints. Attackers can access other tenants' cloud storage objects by creating a separate organization and supplying arbitrary file URIs to presign or stream bucket contents.
Vulnerability class: IDOR (Insecure Direct Object Reference)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.7 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N.
EPSS exploit prediction
EPSS: 0.004 (34.3th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 34th percentile — 34.3% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.002 · newest: 0.004 · change: +0.002
Affected products
Weakness classification (CWE)
References
- github.com/HumanSignal/label-studio (product)
- io_storages/proxy_api.py at 1.23.0 (technical-description)
- GitHub Issue #9924 (issue-tracking)
- VulnCheck Advisory: Label Studio through 1.23.0 Cross-Organization Storage URI Resolution (third-party-advisory)
Frequently asked questions
- What is CVE-2026-85211?
- CVE-2026-85211 is a high-severity vulnerability in Humansignal Label-Studio, classified under Authorization Bypass Through User-Controlled Key. CVSS score: 7.7/10. Published 2026-09-03.
- How severe is CVE-2026-85211?
- High severity. CVSS v3 base score is 7.7 out of 10.