CVE-2026-12811 kortix-ai suna Auth Endpoint page.tsx router.push cross site scripting
Attackers can execute arbitrary scripts via the returnURL parameter in the auth endpoint, potentially leading to session hijacking or code execution.
- 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-2026-12811?
CVE-2026-12811 is a medium-severity cross-site scripting vulnerability in kortix-ai suna, published on 21 Jun 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
A weakness has been identified in kortix-ai suna up to 0.8.38. Affected by this issue is the function router.replace/router.push of the file apps/frontend/src/app/auth/page.tsx of the component Auth Endpoint. Executing a manipulation of the argument returnURL can lead to cross site scripting. The attack may be launched remotely. The exploit has been made available to the public and could be used for attacks. Upgrading to version 0.8.39 can resolve this issue. This patch is called f5dec7aa0c1b8fa0125938f292c0f2430ca75f6c. It is advisable to upgrade the affected component. The researcher explains: "The issue was fixed in v0.8.39 without notifying the wider user base via a security disclosure."
Which versions are affected by CVE-2026-12811?
How do I fix CVE-2026-12811?
No fix has been published for CVE-2026-12811 yet. Limit exposure of the affected software until one is available.
Escape output for the context it lands in and set a strict Content Security Policy. Upgrading the affected component is the real fix. More about Cross-site scripting.
Is CVE-2026-12811 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-12811 exists.
Sources
Also known as GHSA-fpgm-v536-ccc8.