HIGH 7.1 NVD
CVE-2026-109427
Telegram-Stremio through 5.1.0 contains a broken object-level authorization vulnerability that allows authenticated token holders to access arbitrary chat messa
Telegram-Stremio through 5.1.0 contains a broken object-level authorization vulnerability that allows authenticated token holders to access arbitrary chat messages by forging unsigned, unauthenticated stream IDs decoded via encode_string/decode_string functions. 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.
References
- https://gist.github.com/mansurmavlankulov/489554cad7b38e07b9651c217f00fffb
- https://www.vulncheck.com/advisories/telegram-stremio-broken-object-authorization-via-stre
This high severity vulnerability with a CVSS score of 7.1 was published on 2026-10-12 via NVD.
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