Auth bypass in Onearmy Community-Platform
CVE-2026-116018
ONEARMY community-platform before 2.165.2 contains an insecure direct object reference vulnerability that allows authenticated users to mark other users' notifications as read via POST /api/notifications/:id/read. Attackers can iterate sequential notification IDs to suppress unread indicators of users in the same tenant, causing them to miss replies, comments and new-content notices.
Vulnerability class: IDOR (Insecure Direct Object Reference)
Published .
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:N/I:L/A:N.
EPSS exploit prediction
No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.
Affected products
Weakness classification (CWE)
References
- github.com/ONEARMY/community-platform/issues/5022 (issue-tracking)
- github.com/ONEARMY/community-platform/pull/5011 (issue-tracking, patch)
- github.com/ONEARMY/community-platform/commit/571732c26caf1a0a46e5335d275cef2e19… (patch)
- github.com/ONEARMY/community-platform/releases/tag/v2.165.2 (release-notes)
- github.com/ONEARMY/community-platform/blob/v2.163.2/src/routes/api.notification… (technical-description)
- hackmd.io/@hieuPenguinnn/onearmy-community-platform-notification-read-idor (third-party-advisory)
- www.vulncheck.com/advisories/onearmy-community-platform-before-2.165.2-idor-via… (third-party-advisory)
Frequently asked questions
- What is CVE-2026-116018?
- CVE-2026-116018 is a medium-severity vulnerability in Onearmy Community-Platform, classified under Authorization Bypass Through User-Controlled Key. CVSS score: 4.3/10. Published 2026-10-24.
- How severe is CVE-2026-116018?
- Medium severity. CVSS v3 base score is 4.3 out of 10.