CVE-2025-27802

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This allowed an authenticated attacker to execute malicious JavaScript code in the victim's browser.<br></span><br>RTE properties (text fields), which could be used in the \"Edit\" section of the CMS,\nallowed the input of arbitrary text. It was possible to input malicious JavaScript \ncode in these properties that would be executed if a user visits the previewed \npage. Attackers needed at least the role \"WebEditor\" in order to exploit this issue.<br><br>Affected products: Version 11.X: EPiServer.CMS.Core (&lt;11.21.4) with EPiServer.CMS.UI (&lt;11.37.5), Version 12.X: EPiServer.CMS.Core (&lt;12.22.1) with EPiServer.CMS.UI (&lt;11.37.3)"}], "value": "The Episerver Content Management System (CMS) by Optimizely was affected by multiple Stored Cross-Site Scripting (XSS) vulnerabilities. This allowed an authenticated attacker to execute malicious JavaScript code in the victim's browser.\n\nRTE properties (text fields), which could be used in the \"Edit\" section of the CMS,\nallowed the input of arbitrary text. It was possible to input malicious JavaScript \ncode in these properties that would be executed if a user visits the previewed \npage. Attackers needed at least the role \"WebEditor\" in order to exploit this issue.\n\nAffected products: Version 11.X: EPiServer.CMS.Core (<11.21.4) with EPiServer.CMS.UI (<11.37.5), Version 12.X: EPiServer.CMS.Core (<12.22.1) with EPiServer.CMS.UI (<11.37.3)"}], "impacts": [{"capecId": "CAPEC-63", "descriptions": [{"lang": "en", "value": "CAPEC-63 Cross-Site Scripting (XSS)"}]}], "metrics": [{"cvssV4_0": {"Automatable": "NOT_DEFINED", "Recovery": "NOT_DEFINED", "Safety": "NOT_DEFINED", "attackComplexity": "LOW", "attackRequirements": "NONE", "attackVector": "NETWORK", "baseScore": 4.8, "baseSeverity": "MEDIUM", "privilegesRequired": "HIGH", "providerUrgency": "NOT_DEFINED", "subAvailabilityImpact": "NONE", "subConfidentialityImpact": "LOW", "subIntegrityImpact": "LOW", "userInteraction": "PASSIVE", "valueDensity": "NOT_DEFINED", "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:P/VC:N/VI:L/VA:L/SC:L/SI:L/SA:N", "version": "4.0", "vulnAvailabilityImpact": "LOW", "vulnConfidentialityImpact": "NONE", "vulnIntegrityImpact": "LOW", "vulnerabilityResponseEffort": "NOT_DEFINED"}, "format": "CVSS", "scenarios": [{"lang": "en", "value": "GENERAL"}]}, {"cvssV3_1": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "NONE", "baseScore": 4.8, "baseSeverity": "MEDIUM", "confidentialityImpact": "LOW", "integrityImpact": "LOW", "privilegesRequired": "HIGH", "scope": "CHANGED", "userInteraction": "REQUIRED", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:N", "version": "3.1"}, "format": "CVSS", "scenarios": [{"lang": "en", "value": "GENERAL"}]}], "problemTypes": [{"descriptions": [{"cweId": "CWE-79", "description": "CWE-79 Improper Neutralization of Input During Web Page Generation (XSS or 'Cross-site Scripting')", "lang": "en", "type": "CWE"}]}], "providerMetadata": {"orgId": "551230f0-3615-47bd-b7cc-93e92e730bbf", "shortName": "SEC-VLab", "dateUpdated": "2025-07-29T09:38:19.993Z"}, "references": [{"tags": ["patch"], "url": "https://api.nuget.optimizely.com/packages/episerver.cms.core/11.21.4#"}, {"tags": ["patch"], "url": "https://api.nuget.optimizely.com/packages/episerver.cms.core/12.22.1#"}, {"tags": ["third-party-advisory"], "url": "https://r.sec-consult.com/optimizely"}], "solutions": [{"lang": "en", "supportingMedia": [{"base64": false, "type": "text/html", "value": "The vendor already provides a security patch (updated packages) which should be \ninstalled immediately.<br>"}], "value": "The vendor already provides a security patch (updated packages) which should be \ninstalled immediately."}], "source": {"discovery": "UNKNOWN"}, "title": "Stored Cross-Site Scripting in Episerver Content Management System (CMS) Edit Preview", "x_generator": {"engine": "Vulnogram 0.2.0"}}, "adp": [{"metrics": [{"other": {"type": "ssvc", "content": {"timestamp": "2025-07-28T15:33:56.065661Z", "id": "CVE-2025-27802", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "partial"}], "role": "CISA Coordinator", "version": "2.0.3"}}}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2025-07-28T15:51:13.287Z"}}, {"title": "CVE Program Container", "references": [{"url": "http://seclists.org/fulldisclosure/2025/Aug/18"}], "providerMetadata": {"orgId": "af854a3a-2127-422b-91ae-364da2661108", "shortName": "CVE", "dateUpdated": "2025-11-03T19:46:27.417Z"}}]}}

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This allowed an authenticated attacker to execute malicious JavaScript code in the victim's browser.\n\nRTE properties (text fields), which could be used in the \"Edit\" section of the CMS,\nallowed the input of arbitrary text. It was possible to input malicious JavaScript \ncode in these properties that would be executed if a user visits the previewed \npage. Attackers needed at least the role \"WebEditor\" in order to exploit this issue.\n\nAffected products: Version 11.X: EPiServer.CMS.Core (<11.21.4) with EPiServer.CMS.UI (<11.37.5), Version 12.X: EPiServer.CMS.Core (<12.22.1) with EPiServer.CMS.UI (<11.37.3)", "supportingMedia": [{"type": "text/html", "value": "<span style=\"background-color: rgb(255, 255, 255);\">The Episerver Content Management System (CMS) by Optimizely was affected by multiple Stored Cross-Site Scripting (XSS) vulnerabilities. This allowed an authenticated attacker to execute malicious JavaScript code in the victim's browser.<br></span><br>RTE properties (text fields), which could be used in the \"Edit\" section of the CMS,\nallowed the input of arbitrary text. It was possible to input malicious JavaScript \ncode in these properties that would be executed if a user visits the previewed \npage. Attackers needed at least the role \"WebEditor\" in order to exploit this issue.<br><br>Affected products: Version 11.X: EPiServer.CMS.Core (&lt;11.21.4) with EPiServer.CMS.UI (&lt;11.37.5), Version 12.X: EPiServer.CMS.Core (&lt;12.22.1) with EPiServer.CMS.UI (&lt;11.37.3)", "base64": false}]}], "problemTypes": [{"descriptions": [{"lang": "en", "type": "CWE", "cweId": "CWE-79", "description": "CWE-79 Improper Neutralization of Input During Web Page Generation (XSS or 'Cross-site Scripting')"}]}], "providerMetadata": {"orgId": "551230f0-3615-47bd-b7cc-93e92e730bbf", "shortName": "SEC-VLab", "dateUpdated": "2025-07-29T09:38:19.993Z"}}}, "cveMetadata": {"cveId": "CVE-2025-27802", "state": "PUBLISHED", "dateUpdated": "2025-07-29T09:38:19.993Z", "dateReserved": "2025-03-07T06:46:34.309Z", "assignerOrgId": "551230f0-3615-47bd-b7cc-93e92e730bbf", "datePublished": "2025-07-28T08:47:43.486Z", "assignerShortName": "SEC-VLab"}, "dataVersion": "5.1"}

{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "modules": ["EPiServer.CMS.Core"], "product": "Episerver Content Management System (CMS)", "vendor": "Optimizely", "versions": [{"lessThan": "11.21.4", "status": "affected", "version": "11.x", "versionType": "custom"}, {"lessThan": "12.22.1", "status": "affected", "version": "12.x", "versionType": "custom"}]}], "source": "551230f0-3615-47bd-b7cc-93e92e730bbf"}], "cveTags": [], "descriptions": [{"lang": "en", "value": "The Episerver Content Management System (CMS) by Optimizely was affected by multiple Stored Cross-Site Scripting (XSS) vulnerabilities. This allowed an authenticated attacker to execute malicious JavaScript code in the victim's browser.\n\nRTE properties (text fields), which could be used in the \"Edit\" section of the CMS,\nallowed the input of arbitrary text. It was possible to input malicious JavaScript \ncode in these properties that would be executed if a user visits the previewed \npage. Attackers needed at least the role \"WebEditor\" in order to exploit this issue.\n\nAffected products: Version 11.X: EPiServer.CMS.Core (<11.21.4) with EPiServer.CMS.UI (<11.37.5), Version 12.X: EPiServer.CMS.Core (<12.22.1) with EPiServer.CMS.UI (<11.37.3)"}, {"lang": "es", "value": "Episerver Content Management System (CMS) by Optimizely se vio afectado por m\u00faltiples vulnerabilidades de Cross-Site Scripting (XSS) almacenado. Esto permiti\u00f3 que un atacante autenticado ejecutara c\u00f3digo JavaScript malicioso en el navegador de la v\u00edctima. Las propiedades RTE (campos de texto), que se pod\u00edan usar en la secci\u00f3n \"Edit\" del CMS, permit\u00edan la introducci\u00f3n de texto arbitrario. Era posible introducir c\u00f3digo JavaScript malicioso en estas propiedades, que se ejecutaba si un usuario visitaba la p\u00e1gina previsualizada. Los atacantes necesitaban al menos el rol \"WebEditor\" para explotar este problema. Productos afectados: Versi\u00f3n 11.X: EPiServer.CMS.Core (&lt;11.21.4) con EPiServer.CMS.UI (&lt;11.37.5), Versi\u00f3n 12.X: EPiServer.CMS.Core (&lt;12.22.1) con EPiServer.CMS.UI (&lt;11.37.3)."}], "id": "CVE-2025-27802", "lastModified": "2026-06-17T09:04:14.883", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "NONE", "baseScore": 4.8, "baseSeverity": "MEDIUM", "confidentialityImpact": "LOW", "integrityImpact": "LOW", "privilegesRequired": "HIGH", "scope": "CHANGED", "userInteraction": "REQUIRED", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:N", "version": "3.1"}, "exploitabilityScore": 1.7, "impactScore": 2.7, "source": "551230f0-3615-47bd-b7cc-93e92e730bbf", "type": "Secondary"}], "cvssMetricV40": [{"cvssData": {"Automatable": "NOT_DEFINED", "Recovery": "NOT_DEFINED", "Safety": "NOT_DEFINED", "attackComplexity": "LOW", "attackRequirements": "NONE", "attackVector": "NETWORK", "availabilityRequirement": "NOT_DEFINED", "baseScore": 4.8, "baseSeverity": "MEDIUM", "confidentialityRequirement": "NOT_DEFINED", "exploitMaturity": "NOT_DEFINED", "integrityRequirement": "NOT_DEFINED", "modifiedAttackComplexity": "NOT_DEFINED", "modifiedAttackRequirements": "NOT_DEFINED", "modifiedAttackVector": "NOT_DEFINED", "modifiedPrivilegesRequired": "NOT_DEFINED", "modifiedSubAvailabilityImpact": "NOT_DEFINED", "modifiedSubConfidentialityImpact": "NOT_DEFINED", "modifiedSubIntegrityImpact": "NOT_DEFINED", "modifiedUserInteraction": "NOT_DEFINED", "modifiedVulnAvailabilityImpact": "NOT_DEFINED", "modifiedVulnConfidentialityImpact": "NOT_DEFINED", "modifiedVulnIntegrityImpact": "NOT_DEFINED", "privilegesRequired": "HIGH", "providerUrgency": "NOT_DEFINED", "subAvailabilityImpact": "NONE", "subConfidentialityImpact": "LOW", "subIntegrityImpact": "LOW", "userInteraction": "PASSIVE", "valueDensity": "NOT_DEFINED", "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:P/VC:N/VI:L/VA:L/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", "version": "4.0", "vulnAvailabilityImpact": "LOW", "vulnConfidentialityImpact": "NONE", "vulnIntegrityImpact": "LOW", "vulnerabilityResponseEffort": "NOT_DEFINED"}, "source": "551230f0-3615-47bd-b7cc-93e92e730bbf", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2025-27802", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2025-07-28T15:33:56.065661Z", "version": "2.0.3"}}]}, "published": "2025-07-28T09:15:34.747", "references": [{"source": "551230f0-3615-47bd-b7cc-93e92e730bbf", "url": "https://api.nuget.optimizely.com/packages/episerver.cms.core/11.21.4#"}, {"source": "551230f0-3615-47bd-b7cc-93e92e730bbf", "url": "https://api.nuget.optimizely.com/packages/episerver.cms.core/12.22.1#"}, {"source": "551230f0-3615-47bd-b7cc-93e92e730bbf", "url": "https://r.sec-consult.com/optimizely"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "url": "http://seclists.org/fulldisclosure/2025/Aug/18"}], "sourceIdentifier": "551230f0-3615-47bd-b7cc-93e92e730bbf", "vulnStatus": "Deferred", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-79"}], "source": "551230f0-3615-47bd-b7cc-93e92e730bbf", "type": "Secondary"}]}

{}

{"created": "2025-07-28T15:24:22.168164+00:00", "updated": "2025-07-28T15:24:22.168234+00:00", "vendors": ["episerver", "episerver$PRODUCT$episerver", "episerver$PRODUCT$episerver_cms"]}