---
cve: "CVE-2026-101049"
severity: "HIGH"
cvss: 8.3
epss: "0.3%"
vendor: "heymrun"
kev: false
exploited: false
published: "2026-09-27 17:16:55"
tags: [cve, security, high]
source: tsecurity.de CVE-Dossier
exported: "2026-10-03T22:32:59+02:00"
---

# CVE-2026-101049

> 8.3 HIGH · 🧪 PoC

## Beschreibung

Heym before 0.0.53 fails to verify Slack request signatures when trigger nodes lack credential IDs or have empty signing secrets. Remote unauthenticated attackers can send forged Slack events to known webhook URLs to trigger workflows with the owner's credentials.

## CNA-Record (Kanon, cvelistV5)

- CNA: **VulnCheck**
- State: PUBLISHED
- Stand: 2026-09-28 14:18:44
- CNA-CVSS: **8.3** (`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-Anreicherung (vulnrichment/ADP)

- CISA-SSVC (Coordinator, v2.0.3):
  - Exploitation: **poc**
  - Automatable: **no**
  - Technical Impact: **partial**

## CVSS-Vektor

```
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
```

| Metrik | Wert | Bewertung |
|---|---|---|
| AV Angriffsvektor | Netzwerk | bad |
| AC Komplexität | Hoch | good |
| PR Privilegien | Keine | bad |
| UI Interaktion | Keine | bad |

## Patch verfügbar (OSV)

- a8ff9b0ed2a0e87a1b66be56ca0a0ea877e19402 (Commit)
- 341d1012367cd74f85c617e1c98dd49e3fcb5e83 (Commit)

## Referenzen

- <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-slack-webhook-signature-verification-bypass>

---
_Exportiert aus dem [tsecurity.de CVE-Dossier](https://tsecurity.de/cve?cve=CVE-2026-101049) · Datenquellen: EUVD (ENISA), NVD, OSV, CISA KEV, FIRST EPSS, Exploit-DB, BSI WID (CSAF)_