RCE in Kortix-Ai Suna
CVE-2026-12811
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."
Vulnerability class: XSS (Cross-Site Scripting)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 4.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N.
EPSS exploit prediction
EPSS: 0.005 (40.7th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 41st percentile — 40.7% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.005 · newest: 0.005 · change: 0.000
Affected products
- Kortix-Ai Suna — versions 0.8.0, 0.8.1, 0.8.2
Weakness classification (CWE)
References
- vuldb.com/vuln/372605 (technical-description, vdb-entry)
- vuldb.com/vuln/372605/cti (signature, permissions-required)
- vuldb.com/cve/CVE-2026-12811 (third-party-advisory)
- vuldb.com/submit/837175 (third-party-advisory)
- gist.github.com/TrebledJ/fe7241910ac0aaeff86243fc88e9ffed (exploit)
- github.com/kortix-ai/suna/commit/f5dec7aa0c1b8fa0125938f292c0f2430ca75f6c (patch)
- github.com/kortix-ai/suna/releases/tag/v0.8.39 (patch)
- github.com/kortix-ai/suna/ (product)
Frequently asked questions
- What is CVE-2026-12811?
- CVE-2026-12811 is a medium-severity vulnerability in Kortix-Ai Suna, classified under Cross-site Scripting. CVSS score: 4.3/10. Published 2026-06-21.
- How severe is CVE-2026-12811?
- Medium severity. CVSS v3 base score is 4.3 out of 10.