CVE-2026-109426 Telegram-Stremio 5.1.0 Insecure Session Storage via encode_string
Attackers with database access can recover the operator's Telegram session string due to weak encoding, allowing full account takeover.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-109426?
CVE-2026-109426 is a high-severity vulnerability in weebzone Telegram-Stremio, published on 12 Oct 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official 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.
Weakness: CWE-312
Which versions are affected by CVE-2026-109426?
How do I fix CVE-2026-109426?
No fix has been published for CVE-2026-109426 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-109426 being exploited?
There is no known exploitation of CVE-2026-109426 in the wild and no public exploit code.
Sources
Also known as GHSA-f4vq-cf7c-pvmv.