{"id":"CVE-2026-109392","state":"PUBLISHED","title":"Pimcore through 2026.3.1 Stored XSS via ExternalImage Field Version Preview","description":"Pimcore through 2026.3.1 contains a stored cross-site scripting vulnerability that allows authenticated backend users to inject scripts by storing unescaped URLs in ExternalImage fields. Attackers with data object edit permission can store attribute-breaking payloads that execute JavaScript in the admin origin when other users open version preview or diff views.","publishedAt":"2026-10-12T15:16:39.934Z","updatedAt":"2026-10-13T18:22:20.725Z","severity":{"score":5.1,"label":"Medium","version":"4.0","vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:L/VI:L/VA:N/SC:L/SI:L/SA:N","source":"VulnCheck"},"assigner":"VulnCheck","products":["Pimcore Pimcore"],"affected":[{"vendor":"Pimcore","product":"Pimcore","packageURL":"pkg:composer/pimcore/pimcore","defaultStatus":"unaffected","versions":[{"version":"0","status":"affected","lessThanOrEqual":"2026.3.1","versionType":"custom"}],"repo":"https://github.com/pimcore/pimcore"}],"references":["https://hackmd.io/@1ExmmukzRMWN7B4gQ4W-4Q/rJCbgCKjMe","https://github.com/pimcore/pimcore/blob/v2026.3.1/models/DataObject/ClassDefinition/Data/ExternalImage.php#L169-L203","https://github.com/pimcore/admin-ui-classic-bundle/blob/2.3/templates/admin/data_object/data_object/preview_version.html.twig#L198","https://github.com/pimcore/pimcore","https://www.vulncheck.com/advisories/pimcore-through-2026.3.1-stored-xss-via-externalimage-field-version-preview"],"weaknesses":["CWE-79"],"ingestedAt":"2026-10-29T20:10:33.477Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/109xxx/CVE-2026-109392.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-109392","state":"PUBLISHED","datePublished":"2026-10-12T15:16:39.934Z","dateUpdated":"2026-10-13T18:22:20.725Z","assignerShortName":"VulnCheck","assignerOrgId":"83251b91-4cc7-4094-a5c7-464a1b83ea10","dateReserved":"2026-10-12T14:40:42.449Z"},"containers":{"cna":{"title":"Pimcore through 2026.3.1 Stored XSS via ExternalImage Field Version Preview","descriptions":[{"lang":"en","value":"Pimcore through 2026.3.1 contains a stored cross-site scripting vulnerability that allows authenticated backend users to inject scripts by storing unescaped URLs in ExternalImage fields. Attackers with data object edit permission can store attribute-breaking payloads that execute JavaScript in the admin origin when other users open version preview or diff views."}],"affected":[{"vendor":"Pimcore","product":"Pimcore","packageURL":"pkg:composer/pimcore/pimcore","defaultStatus":"unaffected","versions":[{"version":"0","status":"affected","lessThanOrEqual":"2026.3.1","versionType":"custom"}],"repo":"https://github.com/pimcore/pimcore"}],"references":[{"url":"https://hackmd.io/@1ExmmukzRMWN7B4gQ4W-4Q/rJCbgCKjMe","tags":["technical-description","exploit"],"name":"Researcher Disclosure"},{"url":"https://github.com/pimcore/pimcore/blob/v2026.3.1/models/DataObject/ClassDefinition/Data/ExternalImage.php#L169-L203","tags":["technical-description"]},{"url":"https://github.com/pimcore/admin-ui-classic-bundle/blob/2.3/templates/admin/data_object/data_object/preview_version.html.twig#L198","tags":["technical-description"]},{"url":"https://github.com/pimcore/pimcore","tags":["product"]},{"url":"https://www.vulncheck.com/advisories/pimcore-through-2026.3.1-stored-xss-via-externalimage-field-version-preview","name":"VulnCheck Advisory: Pimcore through 2026.3.1 Stored XSS via ExternalImage Field Version Preview","tags":["third-party-advisory"]}],"metrics":[{"format":"CVSS","cvssV4_0":{"version":"4.0","vectorString":"CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:L/VI:L/VA:N/SC:L/SI:L/SA:N","attackVector":"NETWORK","attackComplexity":"LOW","attackRequirements":"NONE","privilegesRequired":"LOW","userInteraction":"PASSIVE","vulnConfidentialityImpact":"LOW","vulnIntegrityImpact":"LOW","vulnAvailabilityImpact":"NONE","subConfidentialityImpact":"LOW","subIntegrityImpact":"LOW","subAvailabilityImpact":"NONE","baseScore":5.1,"baseSeverity":"MEDIUM"}},{"format":"CVSS","cvssV3_1":{"version":"3.1","vectorString":"CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N","attackVector":"NETWORK","attackComplexity":"LOW","privilegesRequired":"LOW","userInteraction":"REQUIRED","scope":"CHANGED","confidentialityImpact":"LOW","integrityImpact":"LOW","availabilityImpact":"NONE","baseScore":5.4,"baseSeverity":"MEDIUM"}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-79","lang":"en","description":"Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')","type":"CWE"}]}],"providerMetadata":{"shortName":"VulnCheck","orgId":"83251b91-4cc7-4094-a5c7-464a1b83ea10","dateUpdated":"2026-10-12T15:16:39.934Z"},"datePublic":"2026-10-12T00:00:00.000Z","cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:a:pimcore:pimcore:*:*:*:*:*:*:*:*","versionEndIncluding":"2026.3.1"}]}]}],"credits":[{"lang":"en","value":"hieuPenguinnn","type":"finder"}],"x_generator":{"engine":"vulncheck-endgame"}},"adp":[{"title":"CISA ADP Vulnrichment","metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-10-13T18:21:59.198477Z","id":"CVE-2026-109392","options":[{"Exploitation":"poc"},{"Automatable":"no"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-10-13T18:22:20.725Z"}}]}}}