CVE-2026-108164Open Source Social Network (OSSN) through 10.1 IDOR via Message Attachment Route
Updated under an hour ago ()
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It affects opensource-socialnetwork. Add what you run to find out whether that includes you.
No exploitation reported and no EPSS estimate yet.
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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.
- CVSS
- 6.5 MEDIUM (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
- Weakness (CWE)
- CWE-639
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- VulnCheck
- NVD analysis
- Deferred
- Record last updated
- Oct 13, 2026
- First seen by InfoSec Signals
- Oct 10, 2026
Affected products
opensource-socialnetwork opensource-socialnetwork opensource_socialnetwork:opensource_socialnetwork (from the name) | through 10.1 | CNA record |
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-attachmentexploit, technical-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
- https://www.vulncheck.com/advisories/open-source-social-network-ossn-through-10.1-idor-via-message-attachment-routethird-party-advisory
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.