{"id":"CVE-2025-27800","state":"PUBLISHED","title":"Stored Cross-Site Scripting in Episerver Content Management System (CMS) Admin Dashboard","description":"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\n\n\nThe Admin dashboard offered the functionality to add gadgets to the dashboard.\nThis included the \"Notes\" gadget. An authenticated attacker with the corresponding\naccess rights (such as \"WebAdmin\") that was impersonating the victim could insert\nmalicious JavaScript code in these notes that would be executed if the victim\nvisited the dashboard.\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)","publishedAt":"2025-07-28T08:33:24.304Z","updatedAt":"2025-11-03T19:46:24.615Z","severity":{"score":4.8,"label":"Medium","version":"4.0","vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N","source":"SEC-VLab"},"assigner":"SEC-VLab","products":["Optimizely Episerver Content Management System (CMS)"],"affected":[{"vendor":"Optimizely","product":"Episerver Content Management System (CMS)","defaultStatus":"unaffected","versions":[{"version":"11.x","status":"affected","lessThan":"11.21.4","versionType":"custom"},{"version":"12.x","status":"affected","lessThan":"12.22.1","versionType":"custom"}],"modules":["EPiServer.CMS.Core"]}],"references":["https://api.nuget.optimizely.com/packages/episerver.cms.core/11.21.4#","https://api.nuget.optimizely.com/packages/episerver.cms.core/12.22.1#","https://r.sec-consult.com/optimizely","http://seclists.org/fulldisclosure/2025/Aug/18"],"weaknesses":["CWE-79"],"ingestedAt":"2026-10-29T20:08:47.682Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2025/27xxx/CVE-2025-27800.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2025-27800","state":"PUBLISHED","datePublished":"2025-07-28T08:33:24.304Z","dateUpdated":"2025-11-03T19:46:24.615Z","assignerShortName":"SEC-VLab","assignerOrgId":"551230f0-3615-47bd-b7cc-93e92e730bbf","dateReserved":"2025-03-07T06:46:34.308Z"},"containers":{"cna":{"title":"Stored Cross-Site Scripting in Episerver Content Management System (CMS) Admin Dashboard","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\n\n\nThe Admin dashboard offered the functionality to add gadgets to the dashboard.\nThis included the \"Notes\" gadget. An authenticated attacker with the corresponding\naccess rights (such as \"WebAdmin\") that was impersonating the victim could insert\nmalicious JavaScript code in these notes that would be executed if the victim\nvisited the dashboard.\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)"}],"affected":[{"vendor":"Optimizely","product":"Episerver Content Management System (CMS)","defaultStatus":"unaffected","versions":[{"version":"11.x","status":"affected","lessThan":"11.21.4","versionType":"custom"},{"version":"12.x","status":"affected","lessThan":"12.22.1","versionType":"custom"}],"modules":["EPiServer.CMS.Core"]}],"references":[{"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":["patch"]},{"url":"https://r.sec-consult.com/optimizely","tags":["third-party-advisory"]}],"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:N/VA:N/SC:L/SI:L/SA:N","version":"4.0","vulnAvailabilityImpact":"NONE","vulnConfidentialityImpact":"NONE","vulnIntegrityImpact":"NONE","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":{"shortName":"SEC-VLab","orgId":"551230f0-3615-47bd-b7cc-93e92e730bbf","dateUpdated":"2025-07-29T09:36:10.631Z"},"credits":[{"lang":"en","type":"finder","value":"Kai Zimmermann, SEC Consult Vulnerability Lab"},{"lang":"en","type":"finder","value":"Felix Beie, SEC Consult Vulnerability Lab"}],"impacts":[{"capecId":"CAPEC-63","descriptions":[{"lang":"en","value":"CAPEC-63 Cross-Site Scripting (XSS)"}]}],"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>\n\n<br>"}],"value":"The vendor already provides a security patch (updated packages) which should be \ninstalled immediately."}],"source":{"discovery":"UNKNOWN"},"x_generator":{"engine":"Vulnogram 0.2.0"}},"adp":[{"title":"CISA ADP Vulnrichment","metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2025-07-28T16:53:49.798098Z","id":"CVE-2025-27800","options":[{"Exploitation":"none"},{"Automatable":"no"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2025-07-28T16:54:13.180Z"}},{"title":"CVE Program Container","references":[{"url":"http://seclists.org/fulldisclosure/2025/Aug/18"}],"providerMetadata":{"shortName":"CVE","orgId":"af854a3a-2127-422b-91ae-364da2661108","dateUpdated":"2025-11-03T19:46:24.615Z"}}]}}}