PT-2026-22832 · Dify · Dify

Cataliniovita-Snyk · CVE-2026-21866 · Published 2026-03-03 · Updated 2026-03-04

Positive Technologies (AI Summary)

CVSS v3.1

5.4

Medium

Base vector

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

Name of the Vulnerable Software and Affected Versions Dify versions prior to 1.11.2

Description Dify, an open-source LLM app development platform, contains a stored cross-site scripting (XSS) issue when rendering Mermaid diagrams within chats. The issue stems from Dify’s default Mermaid configuration utilizing a securityLevel of loose, which permits the execution of potentially unsafe content.

Recommendations Update to version 1.11.2 or later.

Exploit

Fix

XSS

Weakness Enumeration

CWE-79

Related Identifiers

CVE-2026-21866

GHSA-QPV6-75C2-75H4

Affected Products

Dify

References · 12

• 🔥 https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/21xxx/CVE-2026-21866.json · Exploit
• https://github.com/langgenius/dify/commit/ae17537470bba417a8971fff705dd82ecb043564 · Patch
• https://github.com/langgenius/dify/pull/29811 · Patch
• https://github.com/langgenius/dify/security/advisories/GHSA-qpv6-75c2-75h4 · Vendor Advisory
• https://osv.dev/vulnerability/CVE-2026-21866 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2026-21866 · Security Note
• https://twitter.com/infoflowcloud/status/2028961433770193088 · Twitter Post
• https://t.me/CVEtracker/46240 · Telegram Post
• https://t.me/cveNotify/154165 · Telegram Post
• https://t.me/cveNotify/154046 · Telegram Post
• https://twitter.com/CVEnew/status/2028959725732147456 · Twitter Post
• https://twitter.com/VulmonFeeds/status/2029116210936217907 · Twitter Post