Cross-Site Scripting Vulnerability in Kortix AI Suna Auth Endpoint
CVE-2026-12811

5.3MEDIUM

Key Information:

Vendor

Kortix-ai

Status
Suna
Vendor
CVE Published:
21 June 2026

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2026-12811?

A cross-site scripting vulnerability has been identified in the Auth Endpoint of Kortix AI Suna, up to version 0.8.38. This issue allows a remote attacker to manipulate the returnURL parameter in the function router.replace/router.push within the file apps/frontend/src/app/auth/page.tsx. This vulnerability could potentially allow attackers to execute arbitrary scripts in the context of the user's session. It is important for users of the affected product to upgrade to version 0.8.39, which includes a security patch addressing this issue. Notably, the update was released without prior notification to the user base, emphasizing the need for prompt attention to security advisories.

Affected Version(s)

suna 0.8.0

suna 0.8.1

suna 0.8.2

Exploit Proof of Concept (PoC)

PoC code is written by security researchers to demonstrate the vulnerability can be exploited. PoC code is also a key component for weaponization which could lead to ransomware.

CVE-2026-12811 - Proof of Concept

References

https://vuldb.com/vuln/372605
vdb-entrytechnical-description
https://vuldb.com/vuln/372605/cti
signaturepermissions-required
https://vuldb.com/cve/CVE-2026-12811
third-party-advisory

CVSS V4

Score:
5.3
Severity:
MEDIUM
Confidentiality:
None
Integrity:
Low
Availability:
None
Attack Vector:
Network
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
Unknown

Timeline

  • 🟡

    Public PoC available

  • 👾

    Exploit known to exist

  • Vulnerability published

  • Vulnerability Reserved

Credit

trebledj (VulDB User)
VulDB CNA Team
.