Heym before v0.0.112 contains a token leakage vulnerability in build_public_base_url() that allows unauthenticated attackers to redirect HITL review links by spoofing Origin or X-Forwarded-Host headers. Attackers can trigger anonymous workflows with forged headers so reviewer notifications point to attacker domains, capturing capability tokens to submit decisions executed with owner credentials.
{
"cna_assigner": "VulnCheck",
"cwe_ids": [
"CWE-346"
],
"osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/105xxx/CVE-2026-105396.json"
}{
"extracted_events": [
{
"introduced": "0"
},
{
"fixed": "0.0.112"
},
{
"fixed": "v0.0.112"
}
],
"source": [
"AFFECTED_FIELD",
"DESCRIPTION"
]
}