CVE-2026-109427Telegram-Stremio 5.1.0 Broken Object Authorization via Stream IDs
Updated under an hour ago ()
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No exploitation reported and no EPSS estimate yet.
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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.
- CVSS
- 6.5 MEDIUM (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
- Weakness (CWE)
- CWE-639, CWE-862
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- VulnCheck
- NVD analysis
- Deferred
- Record last updated
- Oct 12, 2026
- First seen by InfoSec Signals
- Oct 12, 2026
Affected products
weebzone Telegram-Stremio weebzone:telegram_stremio (from the name) | through 5.1.0 | CNA record |
References
- https://gist.github.com/mansurmavlankulov/489554cad7b38e07b9651c217f00fffbtechnical-description
- https://www.vulncheck.com/advisories/telegram-stremio-broken-object-authorization-via-stream-idsthird-party-advisory
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.