{"id":"CVE-2026-108164","published":"2026-10-10T14:16:37.663","lastModified":"2026-10-16T19:18:44.867","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.","cvssScore":6.5,"cvssSeverity":"MEDIUM","cvssVector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N","cwes":["CWE-639"],"vendors":[],"products":[],"references":[{"url":"https://github.com/opensource-socialnetwork/opensource-socialnetwork","tags":[]},{"url":"https://github.com/opensource-socialnetwork/opensource-socialnetwork/blob/48b53f5b95488187715b2d5b5ae46a993267f83d/components/OssnMessages/ossn_com.php#L149-L156","tags":[]},{"url":"https://github.com/opensource-socialnetwork/opensource-socialnetwork/commit/2e9733d8eaafccdaef3d9b498348c8332e51f48b","tags":[]},{"url":"https://github.com/opensource-socialnetwork/opensource-socialnetwork/issues/2641","tags":[]},{"url":"https://hackmd.io/@leediay/ossn-idor-message-attachment","tags":[]},{"url":"https://www.vulncheck.com/advisories/open-source-social-network-ossn-through-10.1-idor-via-message-attachment-route","tags":[]}],"exploitRefs":[{"url":"https://github.com/opensource-socialnetwork/opensource-socialnetwork","tags":[]},{"url":"https://github.com/opensource-socialnetwork/opensource-socialnetwork/blob/48b53f5b95488187715b2d5b5ae46a993267f83d/components/OssnMessages/ossn_com.php#L149-L156","tags":[]},{"url":"https://github.com/opensource-socialnetwork/opensource-socialnetwork/commit/2e9733d8eaafccdaef3d9b498348c8332e51f48b","tags":[]},{"url":"https://github.com/opensource-socialnetwork/opensource-socialnetwork/issues/2641","tags":[]}],"hasPoc":true,"ai":null}