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Vulnerability record · CVE-2026-100859 · published 27 September 2026

CVE-2026-100859: Server-side request forgery (SSRF) vulnerability

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.

7.1 CVSS 4.0 High CWE-918 · Server-side request forgery (SSRF) Received
7.1CVSS 4.0 base score
—EPSS exploitation probability, 30 days
NoNot in CISA KEV
0Affected product versions listed by NVD
2References
27 Sep 2026Last modified by NVD

Description

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.

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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:

References

LinkTags
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

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Source: NIST National Vulnerability Database (record CVE-2026-100859), CISA KEV, FIRST EPSS. This page is refreshed as NVD updates the record.