{"id":"CVE-2026-103397","url":"https://www.cyber-defence.io/tools/cve/CVE-2026-103397","generatedAt":"2026-10-28T04:18:11.564Z","title":"OpenSave before 2.4.0-beta.1 fails to validate sender identity in WAN relay requests, allowing unpaired room members to impersonate paired devices by spoofing the RelayMessage From field.","description":"OpenSave before 2.4.0-beta.1 fails to validate sender identity in WAN relay requests, allowing unpaired room members to impersonate paired devices by spoofing the RelayMessage From field. Attackers who know the room code can join, read paired peer identifiers from announcements, and send forged requests to access protected sync routes including save data, snapshots, and file operations.","published":"2026-09-30T15:22:29.000Z","lastModified":"2026-10-02T17:17:02.000Z","status":"Deferred","sourceIdentifier":"disclosure@vulncheck.com","cvss":{"version":"4.0","score":6.3,"severity":"MEDIUM","vector":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/M"},"cwe":["CWE-290"],"affected":[],"epss":{"score":0.00219,"percentile":0.12289,"date":"2026-10-27","history":[{"date":"2026-10-01","score":0.0038,"percentile":0.29586}]},"kev":{"listed":false},"exploits":{"count":0,"verified":false,"firstPublished":null,"source":"Exploit-DB (https://gitlab.com/exploit-database/exploitdb)","entries":[]},"verdict":{"level":"low","text":"Lower severity and a low EPSS score (0.22%). Track it; it rarely justifies an emergency change on its own."},"changes":[{"kind":"new","label":"New CVE","at":"2026-09-30T15:22:29.000Z","detail":{"score":"6.3","severity":"MEDIUM","publishedAt":"2026-09-30T15:22:28.530Z"},"summary":"New CVE, medium severity (CVSS 6.3)."}],"references":[{"url":"https://gist.github.com/mansurmavlankulov/2ca66f95965fb9d4aab353bcf2434cdb","source":"disclosure@vulncheck.com"},{"url":"https://github.com/Liquid-co/OpenSave","source":"disclosure@vulncheck.com"},{"url":"https://github.com/Liquid-co/OpenSave/blob/v2.3.1/internal/p2p/wanclient_handlers.go#L268-L282","source":"disclosure@vulncheck.com"},{"url":"https://github.com/Liquid-co/OpenSave/commit/2f2612b13233ac123e01a03cb3008c44bacaeae3","source":"disclosure@vulncheck.com"},{"url":"https://www.vulncheck.com/advisories/opensave-before-2.4.0-beta.1-authentication-bypass-via-spoofed-relay-sender","source":"disclosure@vulncheck.com"}],"sources":{"nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-103397","epss":"https://www.first.org/epss/","kev":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog","exploitdb":"https://www.exploit-db.com/"},"licence":"CC BY 4.0 — link back to the CVE Explorer if you publish the results; upstream data remains subject to its own terms."}