CVE-2026-100859

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.

• 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