---
cve: "CVE-2026-100859"
severity: "HIGH"
cvss: 7.1
epss: "0.3%"
vendor: "heymrun"
kev: false
exploited: false
published: "2026-09-27 02:17:25"
tags: [cve, security, high]
source: tsecurity.de CVE-Dossier
exported: "2026-09-29T09:07:43+02:00"
---

# CVE-2026-100859

> 7.1 HIGH · 🧪 PoC

## Beschreibung

Heym before 0.0.106 contains a credential exfiltration vulnerability in the POST /api/credentials/test endpoint that allows collaborators with shared credential access to exfiltrate the credential owner's secret. Attackers can override the destination URL in the config parameter to cause the server to send decrypted authentication secrets to attacker-controlled endpoints.

## CNA-Record (Kanon, cvelistV5)

- CNA: **VulnCheck**
- State: PUBLISHED
- Stand: 2026-09-27 01:28:49
- CNA-CVSS: **7.1** (`CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N`)

## CVSS-Vektor

```
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N
```

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

## Patch verfügbar (OSV)

- 57efda5952f685e0498449bf66c1342f84cff377 (Commit)

## Referenzen

- <https://github.com/heymrun/heym/security/advisories/GHSA-39qx-wp7x-69rq>
- <https://www.vulncheck.com/advisories/heym-before-0.0.106-credential-exfiltration-via-url-override>

---
_Exportiert aus dem [tsecurity.de CVE-Dossier](https://tsecurity.de/cve?cve=CVE-2026-100859) · Datenquellen: EUVD (ENISA), NVD, OSV, CISA KEV, FIRST EPSS, Exploit-DB, BSI WID (CSAF)_