Description
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.
References8
- github.com/ONEARMY/community-platform/blob/v2.163.2/src/routes/…
- github.com/ONEARMY/community-platform/commit/571732c26caf1a0a46…
- github.com/ONEARMY/community-platform/issues/5022
- github.com/ONEARMY/community-platform/pull/5011
- github.com/ONEARMY/community-platform/releases/tag/v2.165.2
- hackmd.io/@hieuPenguinnn/onearmy-community-platform-notificatio…
- www.vulncheck.com/advisories/onearmy-community-platform-before-…
- hackmd.io/@hieuPenguinnn/onearmy-community-platform-notificatio…
Metrics
- CVSS 3.1
-
4.3
MEDIUM
Score source: CNA
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N - CVSS 4.0
-
5.3
MEDIUM
Score source: CNA
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X - EPSS — exploit probability
- 0% percentile: 12 · as of 8 November 2026
- CWE
- CWE-639
Could this be exploited in your environment?
A patch closes the known hole. A penetration test shows what an attacker can still reach — with proof.