CVE-2026-100859CWE-918ssrf

CVE-2026-100859

Medium · published September 27, 2026

CVSS v3.1
6.5
EPSS
0%
Percentile
16.0
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v3.1
6.5 · MEDIUM
Vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
CVSS v4.0
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
EPSS
0.00253 · 16.0th percentile
Weakness
CWE-918 · Server-Side Request Forgery (SSRF)
Published
2026-09-27T06:17Z
References (2)
https://github.com/heymrun/heym/security/advisories/GHSA-39qx-wp7x-69rq · [email protected]https://www.vulncheck.com/advisories/heym-before-0.0.106-credential-exfiltration-via-url-override · [email protected]
EPSS history
Timeline
  • 28 SEP 03:25Z
    EPSS moved — → 0%
    epss
  • 27 SEP 01:28Z
    Heym before 0.0.106 Credential Exfiltration via URL Override
    cvelistv5