---
id: CVE-2026-109426
title: >-
  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 onl…
summary: >-
  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 onl…
severity: high
cvss: 7.5
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N'
cwe:
  - CWE-312
published: '2026-10-12'
updated: '2026-10-12'
sourceUpdated: '2026-10-12T21:17:11.310'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-109426'
references:
  - url: 'https://gist.github.com/mansurmavlankulov/489554cad7b38e07b9651c217f00fffb'
    label: disclosure@vulncheck.com
  - url: >-
      https://www.vulncheck.com/advisories/telegram-stremio-insecure-session-storage-via-encode-string
    label: disclosure@vulncheck.com
tags:
  - nvd
ingestedAt: '2026-10-12T22:05:40.356Z'
---

## Overview

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.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.