CVE-2026-100859

MEDIUM 6.5

Heym before 0.0.106 Credential Exfiltration via URL Override

CVSS Score

6.5

EPSS Score

0.0%

EPSS Percentile

0th

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.

CWE	CWE-918
Vendor	heymrun
Product	heym
Published	Sep 27, 2026

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CVSS v3 Breakdown

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N

Attack Vector

Network

Attack Complexity

Low

Privileges Required

Low

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

None

Availability

None

Affected Versions

heymrun / heym

0 < 0.0.106

References

NVD ↗ CVE.org ↗ EPSS Data ↗

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

Credits

🔍 roonakyadav mbakgun