CVE-2026-108164

Open Source Social Network (OSSN) through 10.1 IDOR via Message Attachment Route

Published Oct 10, 2026 CVSS 4.0 · 7.1 High EPSS < 1% KEV · Not listed
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.

Remediation

No solution or workaround provided in the CVE record

Tracking

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Advisories

No advisories available
History
Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'poc', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Type Values Removed Values Added
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.
Title Open Source Social Network (OSSN) through 10.1 IDOR via Message Attachment Route
First Time appeared Opensource-socialnetwork
Opensource-socialnetwork open Source Social Network
Weaknesses CWE-639
CPEs cpe:2.3:a:opensource-socialnetwork:open_source_social_network:*:*:*:*:*:*:*:*
Vendors & Products Opensource-socialnetwork
Opensource-socialnetwork open Source Social Network
References
Metrics cvssV3_1

{'score': 6.5, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N'}

cvssV4_0

{'score': 7.1, 'vector': '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'}

Weaknesses

Sources

Status
PUBLISHED
Assigner
VulnCheck
Published
Updated
Oct 13, 2026, 6:29 PM
Reserved
Oct 9, 2026, 3:41 PM
Status
Deferred
Published
Oct 10, 2026, 2:16 PM
Modified
Oct 16, 2026, 7:18 PM