CVE-2026-108164CWE-639

CVE-2026-108164

Medium · published October 10, 2026

CVSS v3.1
6.5
EPSS
0%
Percentile
16.4
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v3.1
6.5 · MEDIUM
Vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
CVSS v4.0
7.1 · 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
EPSS
0.00257 · 16.4th percentile
Weakness
CWE-639 · Authorization Bypass Through User-Controlled Key
Published
2026-10-10T18:16Z
References (6)
https://github.com/opensource-socialnetwork/opensource-socialnetwork · [email protected]https://github.com/opensource-socialnetwork/opensource-socialnetwork/blob/48b53f5b95488187715b2d5b5ae46a993267f83d/components/OssnMessages/ossn_com.php#L149-L156 · [email protected]https://github.com/opensource-socialnetwork/opensource-socialnetwork/commit/2e9733d8eaafccdaef3d9b498348c8332e51f48b · [email protected]https://github.com/opensource-socialnetwork/opensource-socialnetwork/issues/2641 · [email protected]https://hackmd.io/@leediay/ossn-idor-message-attachment · [email protected]https://www.vulncheck.com/advisories/open-source-social-network-ossn-through-10.1-idor-via-message-attachment-route · [email protected]
EPSS history
Timeline
  • 12 OCT 03:26Z
    EPSS moved — → 0%
    epss
  • 10 OCT 13:55Z
    Open Source Social Network (OSSN) through 10.1 IDOR via Message Attachment Route
    cvelistv5
  • 10 OCT 13:55Z
    Open Source Social Network (OSSN) through 10.1 IDOR via Message Attachment Route
    cvelistv5