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Attackers can craft or enumerate sequential msg_id values and set a global flag in the stream_handler endpoint to route requests through the operator's personal Userbot account, exposing private channels, groups, and Saved Messages, while the unauthenticated thumb_handler endpoint further discloses thumbnails from those same chats without any token validation.","state":0,"publishedAt":"2026-10-12T20:35:49.858+00:00","modifiedAt":"2026-10-26T20:33:54.245+00:00","affected":[{"ecosystem":"Vendor product","name":"Telegram-Stremio","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"defaultStatus\": \"unaffected\",\n                    \"vendor\": \"weebzone\",\n                    \"product\": \"Telegram-Stremio\",\n                    \"packageURL\": \"pkg:github/weebzone/Telegram-Stremio\",\n                    \"repo\": \"https://github.com/weebzone/Telegram-Stremio\",\n                    \"versions\": [\n                        {\n                            \"status\": \"affected\",\n                            \"version\": \"0\",\n                            \"versionType\": \"semver\",\n                            \"lessThanOrEqual\": \"5.1.0\"\n                        }\n                    ]\n                }"}],"metrics":[{"system":"CVSS 4.0","vector":"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","score":7.1,"severity":"HIGH"},{"system":"CVSS 3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N","score":6.5,"severity":"MEDIUM"}],"references":["https://gist.github.com/mansurmavlankulov/489554cad7b38e07b9651c217f00fffb","https://www.vulncheck.com/advisories/telegram-stremio-broken-object-authorization-via-stream-ids"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-109427","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-109427","identifiers":["CVE-2026-109427"]},"retained":false,"historicalAffected":[]}],"coverage":[{"source":"cisa-kev:global","scope":"Complete CISA KEV catalog; all vendors. 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