Auth bypass in Oppia
CVE-2026-85210
Oppia's AdminRoleHandler GET endpoint in core/controllers/admin.py is decorated with open_access, allowing any registered user to enumerate privileged accounts and roles. Attackers can query the endpoint with filter_criterion parameters to retrieve usernames holding specific roles, banned flags, and managed topic identifiers without authorization.
Vulnerability class: Broken Access Control
Published · last modified .
CVSS v3 metric
CVSS v3 base score 4.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N.
EPSS exploit prediction
EPSS: 0.003 (26.2th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 26th percentile — 26.2% 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: 0.003 · change: +0.001
Affected products
Weakness classification (CWE)
References
- github.com/oppia/oppia (product)
- github.com/oppia/oppia/blob/v3.5.2/core/controllers/admin.py (technical-description)
- github.com/oppia/oppia/issues/26652 (issue-tracking)
- www.vulncheck.com/advisories/oppia-through-3.5.2-missing-authorization-on-admin… (third-party-advisory)
Frequently asked questions
- What is CVE-2026-85210?
- CVE-2026-85210 is a medium-severity vulnerability in Oppia, classified under Missing Authorization. CVSS score: 4.3/10. Published 2026-09-03.
- How severe is CVE-2026-85210?
- Medium severity. CVSS v3 base score is 4.3 out of 10.