Auth bypass in Growilabs Growi
CVE-2026-84204
GROWI contains an access control vulnerability in the GET /_api/v3/attachment/:id endpoint that fails to validate page access permissions. Authenticated attackers can retrieve attachment metadata from pages they cannot view by supplying known attachment identifiers.
Vulnerability class: Broken Access Control
Published · last modified .
CVSS v3 metric
CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/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/growilabs/growi (product)
- github.com/growilabs/growi/pull/11810 (issue-tracking, patch)
- github.com/growilabs/growi/commit/d298e0b1dbbf568c99db657fa0f7e90f72ddc59b (patch)
- github.com/growilabs/growi/blob/v8.0.2/apps/app/src/server/routes/apiv3/attachm… (technical-description)
- www.vulncheck.com/advisories/growi-through-8.0.2-missing-authorization-on-apiv3… (third-party-advisory)
Frequently asked questions
- What is CVE-2026-84204?
- CVE-2026-84204 is a medium-severity vulnerability in Growilabs Growi, classified under Missing Authorization. CVSS score: 6.5/10. Published 2026-09-01.
- How severe is CVE-2026-84204?
- Medium severity. CVSS v3 base score is 6.5 out of 10.