{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-55839", "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "state": "PUBLISHED", "assignerShortName": "GitHub_M", "dateReserved": "2026-06-17T16:29:38.865Z", "datePublished": "2026-08-18T15:27:18.261Z", "dateUpdated": "2026-08-18T17:46:37.126Z"}, "containers": {"cna": {"title": "Kestra: Stored XSS via custom Markdown [[link]] attribute injection", "problemTypes": [{"descriptions": [{"cweId": "CWE-79", "lang": "en", "description": "CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')", "type": "CWE"}]}], "metrics": [{"cvssV3_1": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "NONE", "baseScore": 8.7, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "LOW", "scope": "CHANGED", "userInteraction": "REQUIRED", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:N", "version": "3.1"}}], "references": [{"name": "https://github.com/kestra-io/kestra/security/advisories/GHSA-34pm-923j-7wf8", "tags": ["x_refsource_CONFIRM"], "url": "https://github.com/kestra-io/kestra/security/advisories/GHSA-34pm-923j-7wf8"}, {"name": "https://github.com/kestra-io/kestra/pull/16835", "tags": ["x_refsource_MISC"], "url": "https://github.com/kestra-io/kestra/pull/16835"}, {"name": "https://github.com/kestra-io/kestra/commit/6c8e6d099ed172cbb6b003b7fb30b7bb1f8f710e", "tags": ["x_refsource_MISC"], "url": "https://github.com/kestra-io/kestra/commit/6c8e6d099ed172cbb6b003b7fb30b7bb1f8f710e"}, {"name": "https://github.com/kestra-io/kestra/releases/tag/v1.3.24", "tags": ["x_refsource_MISC"], "url": "https://github.com/kestra-io/kestra/releases/tag/v1.3.24"}], "affected": [{"vendor": "kestra-io", "product": "kestra", "versions": [{"version": "< 1.3.24", "status": "affected"}]}], "providerMetadata": {"orgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "shortName": "GitHub_M", "dateUpdated": "2026-08-18T15:27:18.261Z"}, "descriptions": [{"lang": "en", "value": "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."}], "source": {"advisory": "GHSA-34pm-923j-7wf8", "discovery": "UNKNOWN"}}, "adp": [{"metrics": [{"other": {"type": "ssvc", "content": {"timestamp": "2026-08-18T17:28:28.962947Z", "id": "CVE-2026-55839", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "total"}], "role": "CISA Coordinator", "version": "2.0.3"}}}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-08-18T17:46:37.126Z"}}]}}

{}

{"affected": [{"affectedData": [{"product": "kestra", "vendor": "kestra-io", "versions": [{"status": "affected", "version": "< 1.3.24"}]}], "source": "security-advisories@github.com"}], "cveTags": [], "descriptions": [{"lang": "en", "value": "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."}], "id": "CVE-2026-55839", "lastModified": "2026-08-18T16:17:53.710", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "NONE", "baseScore": 8.7, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "LOW", "scope": "CHANGED", "userInteraction": "REQUIRED", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:N", "version": "3.1"}, "exploitabilityScore": 2.3, "impactScore": 5.8, "source": "security-advisories@github.com", "type": "Secondary"}]}, "published": "2026-08-18T16:17:53.710", "references": [{"source": "security-advisories@github.com", "url": "https://github.com/kestra-io/kestra/commit/6c8e6d099ed172cbb6b003b7fb30b7bb1f8f710e"}, {"source": "security-advisories@github.com", "url": "https://github.com/kestra-io/kestra/pull/16835"}, {"source": "security-advisories@github.com", "url": "https://github.com/kestra-io/kestra/releases/tag/v1.3.24"}, {"source": "security-advisories@github.com", "url": "https://github.com/kestra-io/kestra/security/advisories/GHSA-34pm-923j-7wf8"}], "sourceIdentifier": "security-advisories@github.com", "vulnStatus": "Received", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-79"}], "source": "security-advisories@github.com", "type": "Primary"}]}

{}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[0,1.3.24)"}}], "enrichment": {"confidence": 100.0, "confidence_source": "matching", "scores": [{"score": 100.0, "source": "matching"}]}, "original": {"product": "kestra", "source": "cna", "vendor": "kestra-io"}, "product": "kestra", "vendor": "kestra-io"}], "created": "2026-08-18T16:30:05.990016+00:00", "updated": "2026-08-18T17:30:15.395106+00:00", "vendors": ["kestra-io", "kestra-io$PRODUCT$kestra"]}