CVE-2026-108164highCWE-639

CVE-2026-108164: high-severity vulnerability in opensource-socialnetwork

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

Published 10 Oct 2026 · Updated 13 Oct 2026

41Vexday Risk Score

No sign of exploitation. It has a public proof of concept.

ssvc Attendcvss 7.1epss 0.3%

exploitation probability

0.3%top 84% of all CVEs

observed exploitation

nono source reports it

1 public exploit(s)

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:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N

Affected products

opensource-socialnetwork · opensource-socialnetwork

public PoCs found — 1

cve_referencehackmd.io/@leediay/ossn-idor-message-attachmentunverified

⚠ Public resources, to assess the exposure of systems you control or are authorized to test. Test only with authorization.

Related CVEs — opensource-socialnetwork

In the same product, most dangerous first.

CVE-2026-41309HIGHOpen Source Social Network (OSSN) Vulnerable to Resource Exhaustion via Malicious Image ProcessingEPSS 0.7%CVE-2026-108950MEDIUMOpen Source Social Network (OSSN) through 10.1 Missing Authorization via Album Photo RoutesEPSS 0.3%

References