CVE-2026-108164
Open Source Social Network (OSSN) through 10.1 IDOR via Message Attachment Route
CVSS Score
6.5
EPSS Score
0.0%
EPSS Percentile
0th
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.
| CWE | CWE-639 |
| Vendor | opensource-socialnetwork |
| Product | opensource-socialnetwork |
| Published | Oct 10, 2026 |
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CVSS v3 Breakdown
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N Attack Vector
Network
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
None
Availability
None
Affected Versions
opensource-socialnetwork / opensource-socialnetwork
0 ≤ 10.1
References
github.com: https://github.com/opensource-socialnetwork/opensource-socialnetwork/issues/2641 github.com: https://github.com/opensource-socialnetwork/opensource-socialnetwork/commit/2e9733d8eaafccdaef3d9b498348c8332e51f48b hackmd.io: https://hackmd.io/@leediay/ossn-idor-message-attachment github.com: https://github.com/opensource-socialnetwork/opensource-socialnetwork/blob/48b53f5b95488187715b2d5b5ae46a993267f83d/components/OssnMessages/ossn_com.php#L149-L156 github.com: https://github.com/opensource-socialnetwork/opensource-socialnetwork vulncheck.com: https://www.vulncheck.com/advisories/open-source-social-network-ossn-through-10.1-idor-via-message-attachment-route
Credits
leediay153 from Viettel Post