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CVE-2026-109427— Telegram-Stremio 5.1.0 Broken Object Authorization via Stream IDs

Quick assessment

Affected
weebzone Telegram-Stremio
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Telegram-Stremio 版本 5.1.0 及更早版本存在一个损坏的对象级授权（Broken Object-Level Authorization, BOLA）漏洞。该漏洞允许持有认证令牌的攻击者通过伪造未签名、未认证的流 ID（这些流 ID 经由 encode_string/decode_string 函数解码），从而访问任意的聊天消息。 攻击者可以构造或枚举连续的 msg_id 值，并在 stream_handler 端点中设置全局标志，将请求路由到操作员的个人 Userbot 账户，从而导致私有频道、

CVSS 6.5 · Medium EPSS 0.21% · P10

Possible ATT&CK Techniques 1 AI

T1135 · Network Share Discovery

Affected Version Matrix 1

VendorProduct Version RangeStatus
weebzone Telegram-Stremio ≤ 5.1.0 affected
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I. Basic Information for CVE-2026-109427

Vulnerability Information
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Vulnerability Title
Telegram-Stremio 5.1.0 Broken Object Authorization via Stream IDs
Source: CVE Program / CVE List V5
Vulnerability Description
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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
通过用户控制密钥绕过授权机制
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
weebzone Telegram-Stremio 0 ~ 5.1.0 -

II. Public POCs for CVE-2026-109427

# POC Description Source Link Shenlong Link
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III. Intelligence Information for CVE-2026-109427

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Vendor Advisories for CVE-2026-109427 (1)

Proof of Concept for CVE-2026-109427 (1)

IV. Related Vulnerabilities

Same product: Telegram-Stremio
Same vendor: weebzone
Same weakness: CWE-639

V. Comments for CVE-2026-109427

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