{"id":"CVE-2026-123206","summary":"EdgeChat before 2.20.3 Missing Authentication for Attachment Download via GET /files/:key","details":"EdgeChat before 2.20.3 contains a missing authentication vulnerability in the GET /files/:key route that allows unauthenticated or banned users to download decrypted public-channel attachments because canAccessFile() accepts a null user id. Attackers holding an attachment object key can omit or supply an invalid token to retrieve plaintext attachments without a session or channel membership.","modified":"2026-11-05T21:32:25.540661256Z","published":"2026-11-05T18:16:41.120Z","database_specific":{"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/123xxx/CVE-2026-123206.json","unresolved_ranges":[{"extracted_events":[{"range":[{"fixed":"2.20.3"}],"source":"AFFECTED_FIELD","strategy":"StandardRange"}]},{"extracted_events":[{"source":"DESCRIPTION","range":[{"fixed":"2.20.3"}]}]}],"cna_assigner":"VulnCheck","cwe_ids":["CWE-306"]},"references":[{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/123xxx/CVE-2026-123206.json"},{"type":"PACKAGE","url":"https://github.com/aozorae/Edgechat"},{"type":"ARTICLE","url":"https://github.com/aozorae/Edgechat/blob/1288c66997d5e2f9eefc515cf60b2072f8d655be/worker/src/data/uploaded-files.js#L146"},{"type":"FIX","url":"https://github.com/aozorae/Edgechat/commit/38cb5cf42d8014ca64624d4f4d565419b2fbeda9"},{"type":"REPORT","url":"https://github.com/aozorae/Edgechat/issues/58"},{"type":"ARTICLE","url":"https://hackmd.io/@hieund/edgechat-files-unauthenticated-public-attachment-disclosure"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-123206"},{"type":"ADVISORY","url":"https://www.vulncheck.com/advisories/edgechat-before-2.20.3-missing-authentication-for-attachment-download-via-get-files-key"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/aozorae/edgechat","events":[{"introduced":"0"},{"fixed":"38cb5cf42d8014ca64624d4f4d565419b2fbeda9"}],"database_specific":{"extracted_events":[{"source":"REFERENCES_COMMIT","range":[{"fixed":"38cb5cf42d8014ca64624d4f4d565419b2fbeda9"}]}]}}],"versions":["v2.1.2","android-v0.2.0-beta.1","android-v0.1.0-beta.1"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-123206.json"}}],"schema_version":"1.9.2","severity":[{"type":"CVSS_V4","score":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N"}]}