CVE-2026-55839

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Source
https://cve.org/CVERecord?id=CVE-2026-55839
Import Source
https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-55839.json
JSON Data
https://api.osv.dev/v1/vulns/CVE-2026-55839
Aliases
Published
2026-08-18T15:27:18Z
Modified
2026-11-05T08:04:53Z
Severity
  • 8.7 (High) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:N CVSS Calculator
Summary
Kestra: Stored XSS via custom Markdown [[link]] attribute injection
Details

Kestra is an open-source, event-driven orchestration platform. Prior to 1.3.24, Kestra's custom Markdown parser in ui/src/utils/markdown_plugins/link.ts allows a user with permission to create or update a Flow description to inject JavaScript event-handler attributes through the custom [[link]] syntax, causing stored cross-site scripting when another user opens the description or information panel in the Flow list. This issue is fixed in version 1.3.24.

Database specific 
{
    "cna_assigner": "GitHub_M",
    "cwe_ids": [
        "CWE-79"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/55xxx/CVE-2026-55839.json"
}
References

Affected packages

Git / github.com/kestra-io/kestra

Affected ranges

Type
GIT
Repo
https://github.com/kestra-io/kestra
Events
Introduced
0 Unknown introduced commit / All previous commits are affected
Fixed
3be7399585d749b691376d5cdca2d5f305d3e69d
Fixed
6c8e6d099ed172cbb6b003b7fb30b7bb1f8f710e
Database specific
Show details 
{
    "extracted_events": [
        {
            "range": [
                {
                    "introduced": "0"
                },
                {
                    "fixed": "1.3.24"
                }
            ],
            "source": "AFFECTED_FIELD",
            "strategy": "StringRangeExpression"
        },
        {
            "range": [
                {
                    "fixed": "6c8e6d099ed172cbb6b003b7fb30b7bb1f8f710e"
                }
            ],
            "source": "REFERENCES_COMMIT"
        },
        {
            "original_tag": "v1.3.24",
            "range": [
                {
                    "fixed": "3be7399585d749b691376d5cdca2d5f305d3e69d"
                }
            ],
            "source": "REFERENCES_TAG"
        }
    ]
}

Affected versions

v0.*
v0.0.1234
v0.19.0
v0.7.0
v0.7.1
v0.8.0
v0.8.1
v0.9.0
v0.9.1
v1.*
v1.3.0
v1.3.0-rc0
v1.3.0-rc1
v1.3.1
v1.3.11
v1.3.13
v1.3.14
v1.3.15
v1.3.16
v1.3.17
v1.3.18
v1.3.19
v1.3.2
v1.3.20
v1.3.21
v1.3.22
v1.3.23
v1.3.3
v1.3.4
v1.3.5
v1.3.6
v1.3.7
v1.3.8
v1.3.9

Database specific

source 
"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-55839.json"
vanir_signatures 
[
    {
        "deprecated": false,
        "digest": {
            "line_hashes": [
                "297296202572655022527630577790639371610",
                "30705252038256403133496644765897357474",
                "212190519357542103839624906608607500834",
                "276126490498029006060330253724748037899"
            ],
            "threshold": 0.9
        },
        "id": "CVE-2026-55839-1625b25f",
        "signature_type": "Line",
        "signature_version": "v1",
        "source": "https://github.com/kestra-io/kestra/commit/3be7399585d749b691376d5cdca2d5f305d3e69d",
        "target": {
            "file": "webserver/src/test/java/io/kestra/webserver/controllers/api/ExecutionControllerRunnerTest.java"
        }
    },
    {
        "deprecated": false,
        "digest": {
            "line_hashes": [
                "46972420862113599697996894423951981611",
                "7680089198672985873628785540808024205",
                "294497054261628931218525196717287575320",
                "94335990106726955021473242635693351811"
            ],
            "threshold": 0.9
        },
        "id": "CVE-2026-55839-20a2d883",
        "signature_type": "Line",
        "signature_version": "v1",
        "source": "https://github.com/kestra-io/kestra/commit/3be7399585d749b691376d5cdca2d5f305d3e69d",
        "target": {
            "file": "core/src/main/java/io/kestra/core/services/ExecutionService.java"
        }
    },
    {
        "deprecated": false,
        "digest": {
            "line_hashes": [
                "95195020528107239059128110597504566298",
                "245428653107967460522412049027340721427",
                "329998110817472970329760349110478630017",
                "97610014912616081293346116682297909611"
            ],
            "threshold": 0.9
        },
        "id": "CVE-2026-55839-40429fff",
        "signature_type": "Line",
        "signature_version": "v1",
        "source": "https://github.com/kestra-io/kestra/commit/3be7399585d749b691376d5cdca2d5f305d3e69d",
        "target": {
            "file": "executor/src/main/java/io/kestra/executor/ExecutorService.java"
        }
    },
    {
        "deprecated": false,
        "digest": {
            "function_hash": "155755684596433115604489316648613726670",
            "length": 1934
        },
        "id": "CVE-2026-55839-7c5ca84f",
        "signature_type": "Function",
        "signature_version": "v1",
        "source": "https://github.com/kestra-io/kestra/commit/3be7399585d749b691376d5cdca2d5f305d3e69d",
        "target": {
            "file": "core/src/main/java/io/kestra/core/services/ExecutionService.java",
            "function": "markAs"
        }
    },
    {
        "deprecated": false,
        "digest": {
            "function_hash": "225400789072083043127980763915076276357",
            "length": 497
        },
        "id": "CVE-2026-55839-be20be1c",
        "signature_type": "Function",
        "signature_version": "v1",
        "source": "https://github.com/kestra-io/kestra/commit/3be7399585d749b691376d5cdca2d5f305d3e69d",
        "target": {
            "file": "executor/src/main/java/io/kestra/executor/ExecutorService.java",
            "function": "handleChildNext"
        }
    }
]
vanir_signatures_modified 
"2026-11-05T08:04:53Z"