---
id: CVE-2026-105396
title: >-
  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
summary: >-
  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 wo…
severity: medium
cvss: 5.4
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N'
cwe:
  - CWE-346
vendor: heymrun
product: heym
affected:
  - heym < 0.0.112
published: '2026-10-05'
updated: '2026-10-05'
sourceUpdated: '2026-10-05T15:17:20.900'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-105396'
references:
  - url: 'https://github.com/heymrun/heym/security/advisories/GHSA-6rv3-wh25-7pg5'
    label: disclosure@vulncheck.com
  - url: >-
      https://www.vulncheck.com/advisories/heym-before-0.0.112-hitl-review-token-leak-via-spoofable-origin-header
    label: disclosure@vulncheck.com
tags:
  - nvd
  - cve.org
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-10-05T14:13:02.577108Z'
ingestedAt: '2026-10-05T12:19:22.670Z'
---

## Overview

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.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.