CVE-2026-21866

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Source
https://cve.org/CVERecord?id=CVE-2026-21866
Import Source
https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-21866.json
JSON Data
https://api.osv.dev/v1/vulns/CVE-2026-21866
Aliases
  • GHSA-qpv6-75c2-75h4
Published
2026-03-03T21:42:25.311Z
Modified
2026-07-08T07:15:45.648907127Z
Severity
  • 5.1 (Medium) CVSS_V4 - 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 CVSS Calculator
Summary
Dify - Stored XSS in chat
Details

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.

Database specific 
{
    "cna_assigner": "GitHub_M",
    "cwe_ids": [
        "CWE-79"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/21xxx/CVE-2026-21866.json"
}
References

Affected packages

Git / github.com/langgenius/dify

Affected ranges

Type
GIT
Repo
https://github.com/langgenius/dify
Events
Introduced
0 Unknown introduced commit / All previous commits are affected
Fixed
0c4233e7df51f146b9d007132f3aca71d36919cb
Fixed
ae17537470bba417a8971fff705dd82ecb043564
Database specific 
{
    "extracted_events": [
        {
            "introduced": "0"
        },
        {
            "fixed": "1.11.2"
        }
    ],
    "cpe": "cpe:2.3:a:dify:dify:*:*:*:*:*:*:*:*",
    "source": [
        "CPE_RANGE",
        "REFERENCES"
    ]
}

Affected versions

0.*
0.10.0
0.10.1
0.10.2
0.11.0
0.11.1
0.11.2
0.12.0
0.12.1
0.13.0
0.13.1
0.13.2
0.14.0
0.14.1
0.14.2
0.15.0
0.15.1
0.15.2
0.15.3
0.2.1
0.2.2
0.3.0
0.3.1
0.3.10
0.3.11
0.3.12
0.3.13
0.3.14
0.3.15
0.3.16
0.3.17
0.3.18
0.3.19
0.3.2
0.3.20
0.3.21
0.3.22
0.3.23
0.3.24
0.3.25
0.3.26
0.3.27
0.3.28
0.3.29
0.3.3
0.3.30
0.3.31
0.3.31-fix1
0.3.31-fix2
0.3.31-fix3
0.3.32
0.3.33
0.3.34
0.3.4
0.3.5
0.3.6
0.3.7
0.3.8
0.3.9
0.4.0
0.4.1
0.4.2
0.4.3
0.4.4
0.4.5
0.4.6
0.4.7
0.4.8
0.4.9
0.5.0
0.5.1
0.5.10
0.5.11
0.5.11-fix1
0.5.2
0.5.3
0.5.4
0.5.5
0.5.6
0.5.7
0.5.8
0.5.9
0.6.0
0.6.0-fix1
0.6.1
0.6.10
0.6.11
0.6.12
0.6.12-fix1
0.6.13
0.6.14
0.6.15
0.6.16
0.6.2
0.6.3
0.6.4
0.6.5
0.6.6
0.6.7
0.6.8
0.6.9
0.7.0
0.7.1
0.7.2
0.7.3
0.8.0
0.8.1
0.8.2
0.8.3
0.9.0
0.9.1
0.9.2
1.*
1.0.0
1.0.1
1.1.0
1.1.1
1.1.2
1.1.3
1.10.0
1.10.1
1.11.0
1.11.1
1.2.0
1.3.0
1.3.1
1.4.0
1.4.1
1.4.2
1.4.3
1.5.0
1.5.1
1.6.0
1.7.0
1.7.1
1.7.2
1.8.0
1.8.1
1.9.0
1.9.1

Database specific

source 
"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-21866.json"