CVE-2026-109427

MEDIUM 6.5

Telegram-Stremio 5.1.0 Broken Object Authorization via Stream IDs

CVSS Score

6.5

EPSS Score

0.0%

EPSS Percentile

0th

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.

CWE	CWE-639 CWE-862
Vendor	weebzone
Product	telegram-stremio
Published	Oct 12, 2026

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CVSS v3 Breakdown

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N

Attack Vector

Network

Attack Complexity

Low

Privileges Required

Low

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

None

Availability

None

Affected Versions

weebzone / Telegram-Stremio

0 ≤ 5.1.0

References

NVD ↗ CVE.org ↗ EPSS Data ↗

gist.github.com: https://gist.github.com/mansurmavlankulov/489554cad7b38e07b9651c217f00fffb vulncheck.com: https://www.vulncheck.com/advisories/telegram-stremio-broken-object-authorization-via-stream-ids

Credits

Mansurzhan Mavlankulov