CVE-2026-109426 HIGH

CVE-2026-109426: Telegram-Stremio 5.1.0 Insecure Session Storage via encode_string

Vendor Weebzone
Product Telegram-Stremio
Weakness CWE-312 · Cleartext storage
Published October 12, 2026
Last update October 13, 2026

CVSS base score

8.2/10
Attack vector Network
Attack complexity Low
Privileges required None
User interaction None
Confidentiality —
Integrity —

CVSS vector

CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N

What the vulnerability does

01Description

Telegram-Stremio through 5.1.0 contains an insecure storage vulnerability that allows attackers with access to the MongoDB database, backups, or logs to recover the operator's authenticated Telegram session string, which is protected only by a keyless, reversible encoding transform rather than actual encryption. Attackers can round-trip the stored value through the repository's own decode_string function with no secret key to obtain a fully authenticated Telegram session, granting complete control of the operator's Telegram account even when two-step verification is enabled.

Key dates

02Disclosure timeline

October 12, 2026 CVE published
October 13, 2026 Record updated