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.

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

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.

Affected products

Growilabs Growi

Weakness classification (CWE)

CWE-862 — Missing Authorization

References

disclosure@vulncheck.com (product)
disclosure@vulncheck.com (issue-tracking, patch)
disclosure@vulncheck.com (patch)
disclosure@vulncheck.com (technical-description)
disclosure@vulncheck.com (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.