What is CVE-2026-42138?

CVE-2026-42138 is a medium-severity vulnerability in Langgenius Dify, classified under Cross-site Scripting. CVSS score: 6.1/10. Published 2026-05-04.

How severe is CVE-2026-42138?

Medium severity. CVSS v3 base score is 6.1 out of 10.

XSS in Langgenius Dify

CVE-2026-42138

Dify is an open-source LLM app development platform. Prior to version 1.13.1, using the method POST /api/files/upload, any unauthenticated user can upload an SVG file with XSS. The method POST /v1/files/upload, which requires authenticatio…

Vulnerability class: XSS (Cross-Site Scripting)

EPSS: 0.001 (24.1th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 6.1 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N.

Affected products

Langgenius Dify — versions < 1.13.1

Weakness classification (CWE)

CWE-79 — Cross-site Scripting

References

security-advisories@github.com (x_refsource_CONFIRM, Exploit, Vendor Advisory)
security-advisories@github.com (x_refsource_MISC, Release Notes)

Frequently asked questions

What is CVE-2026-42138?: CVE-2026-42138 is a medium-severity vulnerability in Langgenius Dify, classified under Cross-site Scripting. CVSS score: 6.1/10. Published 2026-05-04.
How severe is CVE-2026-42138?: Medium severity. CVSS v3 base score is 6.1 out of 10.