CVE-2026-110628 Kan 0.5.5 through 0.6.0 Unauthenticated SSRF via /api/download/attatchment
Unauthenticated attackers can exploit SSRF in Kan to access internal services and cloud metadata when S3_ENDPOINT is unset.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-110628?
CVE-2026-110628 is a critical server-side request forgery vulnerability in kanbn kan, published on 14 Oct 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
Kan 0.5.5 through 0.6.0 contains an unauthenticated server-side request forgery vulnerability in the /api/download/attatchment route due to an incomplete fix for CVE-2026-32255. When S3_ENDPOINT is unset, attackers can pass arbitrary url query parameters to fetch() to read internal services, localhost ports, and cloud instance metadata.
Weakness: CWE-918
Which versions are affected by CVE-2026-110628?
How do I fix CVE-2026-110628?
No fix has been published for CVE-2026-110628 yet. Limit exposure of the affected software until one is available.
Upgrade, and send outbound requests through an allow-list that blocks internal addresses. More about Server-side request forgery.
Is CVE-2026-110628 being exploited?
There is no known exploitation of CVE-2026-110628 in the wild and no public exploit code.
Sources
Also known as GHSA-8p5c-vr7c-5g49.