CVE-2026-101050: Heym before 0.0.53 Authentication Bypass via Telegram Webhook

Severity: medium (CVSS 6.5 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.4% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-09-27 · updated 2026-09-28
Weakness: CWE-287

Description

Heym before 0.0.53 fails to verify the X-Telegram-Bot-Api-Secret-Token header on Telegram webhook endpoints when credential_id is absent or secret_token is empty. Remote unauthenticated attackers can post forged Telegram updates to trigger workflows with the owner's configured credentials and execute actions on attacker-supplied input.

Affected products

heymrun heym: before 0.0.53 — fixed in 0.0.53

How to fix

Upgrade to a fixed version: heymrun heym 0.0.53. Check the vendor advisory for mitigations.

References

https://github.com/heymrun/heym/commit/341d1012367cd74f85c617e1c98dd49e3fcb5e83
https://github.com/heymrun/heym/security/advisories/GHSA-pm6h-x3h5-j38h
https://www.vulncheck.com/advisories/heym-before-0.0.53-authentication-bypass-via-telegram-webhook
https://github.com/heymrun/heym/security/advisories/GHSA-pm6h-x3h5-j38h

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