CVE-2026-85021: langgenius dify Splash Layout splash.tsx router.replace cross site scripting
Advisory generated from the CVE record, CISA, Exploit Observer and VEDAS: what it is, whether it is exploited, who is affected, and how to fix and detect it.
Generated by VEDAS. Scores as of 2026-11-01 19:19 UTC. Rebuilt every few hours from cve-scores, CISA KEV and vedas-signatures. How this works and its limits.
What it is
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.
Description quoted from the CVE record (assigned by VulDB, published 2026-09-03).
Weakness: Cross Site Scripting; Code Injection
How it can be exploited
Exploitable over the network with low attack complexity with no special attack requirements needing no privileges and a user must take an action. Impact: confidentiality none, integrity low, availability none. 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 assessment (SSVC): CISA assesses that a public proof of concept exists. Automatable: no. Technical impact: partial.
Public exploit evidence (Exploit Observer)
Also known as: EUVD-2026-70297, GHSA-mf5r-rpc2-6jqp
VEDAS cluster: VEDAS:FRETLESSFROST
Exploit Observer links 3 pieces of public exploit code or detection modules that name this CVE or one of its aliases.
Exploit code and modules (3)
Code that names this CVE. A repository can be a working exploit, a scanner, a fake or malware; read it before running anything.
- Code repository: https://raw.githubusercontent.com/ARPSyndicate/vedas-signatures/main/suricata/2026/CVE-2026-85021.rules
- Code repository: https://raw.githubusercontent.com/ARPSyndicate/vedas-signatures/main/suricata/2026/CVE-2026-85021.rules
- Code repository: https://raw.githubusercontent.com/ARPSyndicate/vedas-signatures/main/suricata/2026/CVE-2026-85021.rules
Vulnerability databases and vendor advisories (4)
Catalogue entries, not exploit evidence.
- Vulnerability database or vendor advisory: https://euvd.enisa.europa.eu/enisa/EUVD-2026-70297
- Vulnerability database or vendor advisory: https://github.com/advisories/GHSA-mf5r-rpc2-6jqp
- Vulnerability database or vendor advisory: https://nvd.nist.gov/vuln/detail/CVE-2026-85021
- Vulnerability database or vendor advisory: https://osv.dev/vulnerability/CVE-2026-85021
2 more references returned by Exploit Observer did not name this CVE or an alias, so they are left out.
VEDAS data as of 2026-11-01T17:12 UTC; fetched 2026-11-02.
Live scores
- EPSS
- 0.005
low predicted chance of attack - VEDAS
- 0.986
strong exploit evidence - On CISA KEV
- Not listed
- Detection rule
- Suricata
Who is affected
| Product | Affected | Not affected |
|---|---|---|
| langgenius dify | version 1.13.0 | Not stated |
Version ranges exactly as the CVE record states them. “Before X” means X is the first fixed version.
How to fix it
No fixed version or vendor advisory is listed in the CVE record yet. Watch the vendor’s security page.
How to detect it
Suricata rules (network detection)
1 rule that alert on traffic matching this exploit: VEDAS CVE-2026-85021 Dify - Client-Side DOM XSS via redirect_url. Add them to your Suricata rule set and reload.
Show the rules
# CVE-2026-85021 - Dify 1.13.0 client-side (DOM) XSS: the Splash share layout
# (web/app/(shareLayout)/components/splash.tsx) passes the redirect_url query parameter to
# router.replace()/window.location, allowing a javascript: URL to execute. No server
# reflection, so this matches the request carrying a javascript: redirect_url value.
alert http $EXTERNAL_NET any -> $HTTP_SERVERS $HTTP_PORTS (msg:"VEDAS CVE-2026-85021 Dify - Client-Side DOM XSS via redirect_url"; flow:established,to_server; http.uri; content:"redirect_url="; nocase; fast_pattern; pcre:"/[?&]redirect_url=[^&]*javascript(?::|%3a)/i"; classtype:web-application-attack; reference:cve,CVE-2026-85021; reference:url,https://www.exploit.observer/?keyword=CVE-2026-85021&match=exact; reference:url,https://subdomain.center/?engine=ammonites&keyword=dify&match=exact; sid:1097807; rev:1;)
CVE-2026-85021.rules on GitHub
References
Exploits and technical analysis
- VDB-398288 | langgenius dify Splash Layout splash.tsx router.replace cross site scripting (vdb-entry, technical-description)
- CVE-2026-85021 | CVE Analysis and Report (third-party-advisory)
- Submit #880601 | langgenius dify 1.13.0 DOM-Based XSS, Open Redirect (third-party-advisory)
- https://gist.github.com/TrebledJ/0e8466e5c39a6fb7dca8a3acdfbe2ddc#file-cvd_dify_vuln1_20260705-md (exploit)
Other references
- VDB-398288 | CTI Indicators (IOB, IOC, TTP, IOA) (signature, permissions-required)
- https://huntr.com/bounties/8ff349b3-db5f-4b56-9ccf-a19abd96e30f (related)
- https://github.com/langgenius/dify/security/advisories/GHSA-7qgm-pqv4-668x (broken-link)
- https://github.com/langgenius/dify/ (product)
Other databases
Where this comes from
This advisory is generated automatically by VEDAS from: CVE.org record, cve-scores (EPSS and VEDAS), Exploit Observer, vedas-signatures. Text in quotes is reproduced from the source; everything else is a fixed template filled with source fields. Nothing here is written by a language model. Check the vendor advisory before acting, and read how VEDAS and Exploit Observer work, and their limits.