CVE-2026-108164
Open Source Social Network (OSSN) through 10.1 IDOR via Message Attachment Route
- State
- Published
- Severity
- 7.1 High
- Published
- Oct 10, 2026
- Updated
- Oct 13, 2026
- Reserved
- Oct 9, 2026
Description
Open Source Social Network (OSSN) through 10.1 contains an insecure direct object reference vulnerability in components/OssnMessages/ossn_com.php that allows authenticated users to read other users' private message attachments. Attackers can request the /messages/attachment/{guid} route with sequential or guessed file GUIDs to retrieve attachments from private conversations without sender or recipient verification.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 4.0 | 7.1 High | CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N | VulnCheck |
| 3.1 | 6.5 Medium | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N | VulnCheck |
Weaknesses
- CWE-639 Authorization Bypass Through User-Controlled Key
Affected Products
| Product | Versions |
|---|---|
opensource-socialnetworkopensource-socialnetwork |
|
References
- https://github.com/opensource-socialnetwork/opensource-socialnetwork/issues/2641issue-tracking
- https://github.com/opensource-socialnetwork/opensource-socialnetwork/commit/2e9733d8eaafccdaef3d9b498348c8332e51f48bpatch
- https://hackmd.io/@leediay/ossn-idor-message-attachmentexploittechnical-description
- https://github.com/opensource-socialnetwork/opensource-socialnetwork/blob/48b53f5b95488187715b2d5b5ae46a993267f83d/components/OssnMessages/ossn_com.php#L149-L156technical-description
- https://github.com/opensource-socialnetwork/opensource-socialnetworkproduct
- VulnCheck Advisory: Open Source Social Network (OSSN) through 10.1 IDOR via Message Attachment Routethird-party-advisory
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