CVE-2026-42138

Description

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 authentication through the application API, is also vulnerable. This issue has been patched in version 1.13.1.

CVSS v3.1 Score

6.1

MEDIUM

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

EPSS — Exploit Prediction

0.0006

Probability of exploitation

0.19%

Percentile rank

EPSS estimates the probability that this vulnerability will be exploited in the wild within the next 30 days. A higher score means more likely to be exploited.

Weakness Type (CWE)

CWE-79 Cross-site Scripting (XSS)

Affected Products

Vendor	Product	Versions
langgenius	dify	< 1.13.1

References

Advisories & Patches

https://github.com/langgenius/dify/security/advisories/GHSA-cg94-8v83-7hjj https://github.com/langgenius/dify/security/advisories/GHSA-cg94-8v83-7hjj

Exploits

https://github.com/langgenius/dify/security/advisories/GHSA-cg94-8v83-7hjj https://github.com/langgenius/dify/security/advisories/GHSA-cg94-8v83-7hjj

Other References

https://github.com/langgenius/dify/releases/tag/1.13.1

Frequently Asked Questions

What is 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 authentication through the application API, is also vulnerable. This issue has been patched in version 1.13.1. It has a CVSS v3.1 base score of 6.1 (MEDIUM).

How severe is CVE-2026-42138? +

CVE-2026-42138 has a CVSS v3.1 score of 6.1 out of 10, rated MEDIUM. This is a medium-severity vulnerability that should be remediated as part of regular maintenance. The EPSS score is 0.0006, placing it in the 0th percentile for exploitation probability.

What products are affected by CVE-2026-42138? +

CVE-2026-42138 affects products from langgenius, specifically: dify. Check the affected products table above for specific version ranges.

How do I check if I'm vulnerable to CVE-2026-42138? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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