SB20260727382 - Cross-site scripting in Dify

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Main Vulnerability Database SB20260727382

SB20260727382 - Cross-site scripting in Dify

Published: July 27, 2026

Security Bulletin ID SB20260727382
CSH Severity
Low
Patch available
YES
Number of vulnerabilities 1
Exploitation vector Remote access
Highest impact Data manipulation

Breakdown by Severity

Low 100%
  • Low
  • Medium
  • High
  • Critical

Description

This security bulletin contains information about 1 vulnerability.


1) Cross-site scripting (CVE-ID: CVE-2026-21866)

CWE-ID: CWE-79 - Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

CVSSv4: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N/E:U/U:Clear


The vulnerability allows a remote user to disclose sensitive information.

The vulnerability exists due to cross-site scripting in the Mermaid diagram rendering component when rendering Mermaid diagrams within chat conversations. A remote user can create a malicious chat containing a javascript: payload to disclose sensitive information.

User interaction is required to click the generated element in a shared chat.


Remediation

Install update from vendor's website.

References