Quick answers
- Is CVE-2026-85021 exploited in the wild?
- No. Junglewise Threat Intelligence has no report of CVE-2026-85021 being exploited in the wild.
- How severe is CVE-2026-85021?
- Medium severity, with a CVSS score of 4.3, published 3 September 2026.
- Which products and versions are affected?
- Langgenius Dify 1.13.0.
- Is there a fix for CVE-2026-85021?
- No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.
- How is CVE-2026-85021 attacked?
- It is attacked over the network.
- Am I affected by CVE-2026-85021?
- Check whether you run Langgenius Dify at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.
Technical details
A DOM-based XSS vulnerability exists in the Splash layout component (web/app/(shareLayout)/components/splash.tsx) where the redirect_url query parameter is passed unsanitized to Next.js router.replace(), which ultimately passes it to window.location. The vulnerable code reads the redirect_url parameter from search params and passes it directly to router.replace without sanitizing for the javascript: protocol. An attacker can craft a malicious URL that satisfies the application's URL parsing requirements and executes arbitrary JavaScript in the context of the victim's browser. The attack is network-accessible and does not require authentication; it relies on social engineering to trick a user into clicking a malicious link. No patch has been released by the vendor despite early disclosure on 2026-03-10.
Affected products
- langgenius Dify 1.13.0
Timeline
- 2026-03-10: disclosed: Disclosed to maintainers on GHSA
- 2026-09-03: advisory: CVE-2026-85021 published
- 2026-03-13: other: Also disclosed on Huntr