{"id":"CVE-2025-27802","aliases":["EUVD-2025-22862","GHSA-hwcj-2grf-hc24"],"status":"published","title":"Stored Cross-Site Scripting in Episerver Content Management System (CMS) Edit Preview","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\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 (\u003c11.21.4) with EPiServer.CMS.UI (\u003c11.37.5), Version 12.X: EPiServer.CMS.Core (\u003c12.22.1) with EPiServer.CMS.UI (\u003c11.37.3)","severity":{"version":"4.0","score":4.8,"vector":"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","level":"medium","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-11","score":0.00365,"percentile":0.30693,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-79"],"published":"2025-07-28T08:47:43Z","modified":"2026-06-17T09:04:14Z","products":[{"vendor":"optimizely","product":"episerver content management system (cms)"}],"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"]},{"url":"http://seclists.org/fulldisclosure/2025/Aug/18"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2025-27802"},{"url":"https://support.optimizely.com/hc/en-us/articles/30886353301645-2025-Optimizely-CMS-11-PaaS-release-notes#h_01K09MR1SZS4FEAPD4478GQ0FR"},{"url":"https://support.optimizely.com/hc/en-us/articles/37757063222029-2024-Optimizely-CMS-12-PaaS-release-notes#h_01JN4AZV48WKNADH3KWC2GYDS5"},{"url":"https://github.com/advisories/GHSA-hwcj-2grf-hc24"}],"sources":{"cve":[{"id":"CVE-2025-27802","title":"Stored Cross-Site Scripting in Episerver Content Management System (CMS) Edit Preview","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\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 (\u003c11.21.4) with EPiServer.CMS.UI (\u003c11.37.5), Version 12.X: EPiServer.CMS.Core (\u003c12.22.1) with EPiServer.CMS.UI (\u003c11.37.3)","status":"published","published":"2025-07-28T08:47:43.486Z","modified":"2025-11-03T19:46:27.417Z","cvss":[{"version":"4.0","score":4.8,"vector":"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","level":"medium","assessor":"cna"},{"version":"3.1","score":4.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:N","level":"medium","assessor":"cna"}],"cwes":["CWE-79"],"updated_at":"2026-11-02T14:32:42.411662Z"}],"euvd":[{"id":"EUVD-2025-22862","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\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 (\u003c11.21.4) with EPiServer.CMS.UI (\u003c11.37.5), Version 12.X: EPiServer.CMS.Core (\u003c12.22.1) with EPiServer.CMS.UI (\u003c11.37.3)","status":"published","published":"2025-07-28T08:47:43Z","modified":"2025-11-03T19:46:27Z","cvss":[{"version":"4.0","score":4.8,"vector":"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","level":"medium"}],"updated_at":"2026-11-02T19:49:33.269212Z"}],"ghsa":[{"id":"GHSA-hwcj-2grf-hc24","title":"The Episerver Content Management System (CMS) by Optimizely was affected by multiple Stored Cross...","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\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 (\u003c11.21.4) with EPiServer.CMS.UI (\u003c11.37.5), Version 12.X: EPiServer.CMS.Core (\u003c12.22.1) with EPiServer.CMS.UI (\u003c11.37.3)","status":"published","published":"2025-07-28T09:31:17Z","modified":"2025-11-03T21:34:12Z","cvss":[{"version":"4.0","score":4.6,"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:A/VC:N/VI:N/VA:N/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","level":"medium"},{"version":"3.1","score":4.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:N","level":"medium"}],"cwes":["CWE-79"],"updated_at":"2026-11-02T15:04:23.841448Z"}],"nvd":[{"id":"CVE-2025-27802","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\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 (\u003c11.21.4) with EPiServer.CMS.UI (\u003c11.37.5), Version 12.X: EPiServer.CMS.Core (\u003c12.22.1) with EPiServer.CMS.UI (\u003c11.37.3)","status":"published","published":"2025-07-28T09:15:34.747Z","modified":"2026-06-17T09:04:14.883Z","cvss":[{"version":"4.0","score":4.8,"vector":"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","level":"medium","assessor":"secondary"},{"version":"3.1","score":4.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:N","level":"medium","assessor":"secondary"}],"cwes":["CWE-79"],"updated_at":"2026-11-02T14:11:21.132141Z"}]}}