CVE-2026-105396 Heym before v0.0.112 HITL Review Token Leak via Spoofable Origin Header
Attackers can spoof headers to leak HITL review tokens, enabling unauthorized decision submission with owner privileges.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- None listed
What is CVE-2026-105396?
CVE-2026-105396 is a medium-severity vulnerability in heymrun heym, published on 5 Oct 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Official description
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.
Weakness: CWE-346
Which versions are affected by CVE-2026-105396?
How do I fix CVE-2026-105396?
No fix has been published for CVE-2026-105396 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-105396 being exploited?
There is no known exploitation of CVE-2026-105396 in the wild and no public exploit code.
Sources
Also known as GHSA-6rv3-wh25-7pg5, GHSA-84cp-gph2-pv3x.