{"id":"CVE-2026-108164","title":"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","summary":"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…","severity":"medium","cvss":6.5,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N","cwe":["CWE-639"],"vendor":"opensource-socialnetwork","product":"opensource-socialnetwork","affected":["opensource-socialnetwork <= 10.1"],"published":"2026-10-10","updated":"2026-10-16","sourceUpdated":"2026-10-16T19:18:44.867","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-108164","references":[{"url":"https://github.com/opensource-socialnetwork/opensource-socialnetwork","label":"disclosure@vulncheck.com"},{"url":"https://github.com/opensource-socialnetwork/opensource-socialnetwork/blob/48b53f5b95488187715b2d5b5ae46a993267f83d/components/OssnMessages/ossn_com.php#L149-L156","label":"disclosure@vulncheck.com"},{"url":"https://github.com/opensource-socialnetwork/opensource-socialnetwork/commit/2e9733d8eaafccdaef3d9b498348c8332e51f48b","label":"disclosure@vulncheck.com"},{"url":"https://github.com/opensource-socialnetwork/opensource-socialnetwork/issues/2641","label":"disclosure@vulncheck.com"},{"url":"https://hackmd.io/@leediay/ossn-idor-message-attachment","label":"disclosure@vulncheck.com"},{"url":"https://www.vulncheck.com/advisories/open-source-social-network-ossn-through-10.1-idor-via-message-attachment-route","label":"disclosure@vulncheck.com"}],"tags":["nvd","cve.org","exploit-available"],"epss":0.00257,"epssPercentile":0.17308,"exploitAvailable":true,"ssvc":{"exploitation":"poc","automatable":"no","technicalImpact":"partial","timestamp":"2026-10-13T18:29:08.792260Z"},"ingestedAt":"2026-10-10T15:25:58.082Z","slug":"CVE-2026-108164","body":"## Overview\n\nOpen 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.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"twilight","depthScore":48,"depthScoreParts":{"impact":35.8,"likelihood":0.1,"exploitation":12,"ransomware":0},"changes":[{"seq":221069,"id":"CVE-2026-108164","ts":1792027059087,"field":"exploit_available","old":"false","new":"true"}]}