{"id":"CVE-2026-108164","summary":"Open Source Social Network (OSSN) through 10.1 IDOR via Message Attachment Route","details":"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.","modified":"2026-10-12T02:30:59.080450399Z","published":"2026-10-10T13:55:14.834Z","database_specific":{"cna_assigner":"VulnCheck","cwe_ids":["CWE-639"],"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/108xxx/CVE-2026-108164.json"},"references":[{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/108xxx/CVE-2026-108164.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-108164"},{"type":"ADVISORY","url":"https://www.vulncheck.com/advisories/open-source-social-network-ossn-through-10.1-idor-via-message-attachment-route"},{"type":"REPORT","url":"https://github.com/opensource-socialnetwork/opensource-socialnetwork/issues/2641"},{"type":"FIX","url":"https://github.com/opensource-socialnetwork/opensource-socialnetwork/commit/2e9733d8eaafccdaef3d9b498348c8332e51f48b"},{"type":"PACKAGE","url":"https://github.com/opensource-socialnetwork/opensource-socialnetwork"},{"type":"ARTICLE","url":"https://github.com/opensource-socialnetwork/opensource-socialnetwork/blob/48b53f5b95488187715b2d5b5ae46a993267f83d/components/OssnMessages/ossn_com.php#L149-L156"},{"type":"EVIDENCE","url":"https://hackmd.io/@leediay/ossn-idor-message-attachment"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/opensource-socialnetwork/opensource-socialnetwork","events":[{"introduced":"0"},{"fixed":"966f264bee01ac4d3d215c81647ab98dda0c03ed"},{"fixed":"2e9733d8eaafccdaef3d9b498348c8332e51f48b"}],"database_specific":{"extracted_events":[{"introduced":"0"},{"fixed":"10.1"}],"source":["DESCRIPTION","REFERENCES"]}}],"versions":["10.0","9.11","9.10","9.9","9.8","9.7","9.6","9.5","9.4","9.3","9.2","9.1","9.0","8.9","8.8","8.7","8.6","8.5","8.4","8.3","8.2","8.1","8.0","7.6","7.5","7.4","7.3","7.2","7.1","7.0","6.6","6.5.0","6.5","6.4","6.3","6.2","6.1","v6.0","5.6"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-108164.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V4","score":"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"}]}