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Vulnerability Details :

CVE-2026-21866

Summary
Assigner-GitHub_M
Assigner Org ID-a0819718-46f1-4df5-94e2-005712e83aaa
Published At-03 Mar, 2026 | 21:42
Updated At-03 Mar, 2026 | 21:43
Rejected At-
Credits

Dify - Stored XSS in chat

Dify is an open-source LLM app development platform. Prior to 1.11.2, Dify is vulnerable to a stored XSS issue when rendering Mermaid diagrams within chats. This occurs because Dify’s default Mermaid configuration uses securityLevel: loose, which allows potentially unsafe content to execute. This vulnerability is fixed in 1.11.2.

Vendors
-
Not available
Products
-
Metrics (CVSS)
VersionBase scoreBase severityVector
Weaknesses
Attack Patterns
Solution/Workaround
References
HyperlinkResource Type
EPSS History
Score
Latest Score
-
N/A
No data available for selected date range
Percentile
Latest Percentile
-
N/A
No data available for selected date range
Stakeholder-Specific Vulnerability Categorization (SSVC)
▼Common Vulnerabilities and Exposures (CVE)
cve.org
Assigner:GitHub_M
Assigner Org ID:a0819718-46f1-4df5-94e2-005712e83aaa
Published At:03 Mar, 2026 | 21:42
Updated At:03 Mar, 2026 | 21:43
Rejected At:
▼CVE Numbering Authority (CNA)
Dify - Stored XSS in chat

Dify is an open-source LLM app development platform. Prior to 1.11.2, Dify is vulnerable to a stored XSS issue when rendering Mermaid diagrams within chats. This occurs because Dify’s default Mermaid configuration uses securityLevel: loose, which allows potentially unsafe content to execute. This vulnerability is fixed in 1.11.2.

Affected Products
Vendor
langgenius
Product
dify
Versions
Affected
  • < 1.11.2
Problem Types
TypeCWE IDDescription
CWECWE-79CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
Type: CWE
CWE ID: CWE-79
Description: CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
Metrics
VersionBase scoreBase severityVector
4.05.1MEDIUM
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
Version: 4.0
Base score: 5.1
Base severity: MEDIUM
Vector:
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
Metrics Other Info
Impacts
CAPEC IDDescription
Solutions

Configurations

Workarounds

Exploits

Credits

Timeline
EventDate
Replaced By

Rejected Reason

References
HyperlinkResource
https://github.com/langgenius/dify/security/advisories/GHSA-qpv6-75c2-75h4
x_refsource_CONFIRM
https://github.com/langgenius/dify/pull/29811
x_refsource_MISC
https://github.com/langgenius/dify/commit/ae17537470bba417a8971fff705dd82ecb043564
x_refsource_MISC
Hyperlink: https://github.com/langgenius/dify/security/advisories/GHSA-qpv6-75c2-75h4
Resource:
x_refsource_CONFIRM
Hyperlink: https://github.com/langgenius/dify/pull/29811
Resource:
x_refsource_MISC
Hyperlink: https://github.com/langgenius/dify/commit/ae17537470bba417a8971fff705dd82ecb043564
Resource:
x_refsource_MISC
Information is not available yet
▼National Vulnerability Database (NVD)
nvd.nist.gov
Source:security-advisories@github.com
Published At:03 Mar, 2026 | 22:16
Updated At:03 Mar, 2026 | 22:16

Dify is an open-source LLM app development platform. Prior to 1.11.2, Dify is vulnerable to a stored XSS issue when rendering Mermaid diagrams within chats. This occurs because Dify’s default Mermaid configuration uses securityLevel: loose, which allows potentially unsafe content to execute. This vulnerability is fixed in 1.11.2.

CISA Catalog
Date AddedDue DateVulnerability NameRequired Action
N/A
Date Added: N/A
Due Date: N/A
Vulnerability Name: N/A
Required Action: N/A
Metrics
TypeVersionBase scoreBase severityVector
Secondary4.05.1MEDIUM
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:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Type: Secondary
Version: 4.0
Base score: 5.1
Base severity: MEDIUM
Vector:
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:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
CPE Matches

Weaknesses
CWE IDTypeSource
CWE-79Primarysecurity-advisories@github.com
CWE ID: CWE-79
Type: Primary
Source: security-advisories@github.com
Evaluator Description

Evaluator Impact

Evaluator Solution

Vendor Statements

References
HyperlinkSourceResource
https://github.com/langgenius/dify/commit/ae17537470bba417a8971fff705dd82ecb043564security-advisories@github.com
N/A
https://github.com/langgenius/dify/pull/29811security-advisories@github.com
N/A
https://github.com/langgenius/dify/security/advisories/GHSA-qpv6-75c2-75h4security-advisories@github.com
N/A
Hyperlink: https://github.com/langgenius/dify/commit/ae17537470bba417a8971fff705dd82ecb043564
Source: security-advisories@github.com
Resource: N/A
Hyperlink: https://github.com/langgenius/dify/pull/29811
Source: security-advisories@github.com
Resource: N/A
Hyperlink: https://github.com/langgenius/dify/security/advisories/GHSA-qpv6-75c2-75h4
Source: security-advisories@github.com
Resource: N/A

Change History

0
Information is not available yet

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||
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CWE ID-CWE-79
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