{"id":"CVE-2025-34401","title":"MailEnable versions prior to 10.54 contain a reflected cross-site scripting (XSS) vulnerability in the FieldBcc parameter of /Mondo/lang/sys/Forms/AddressBook.aspx","summary":"MailEnable versions prior to 10.54 contain a reflected cross-site scripting (XSS) vulnerability in the FieldBcc parameter of /Mondo/lang/sys/Forms/AddressBook.aspx. The FieldBcc value is not properly sanitized when processed via a GET re…","severity":"medium","cvss":6.1,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N","cwe":["CWE-79"],"vendor":"mailenable","product":"mailenable","affected":["mailenable < 10.54"],"patched":["mailenable 10.54"],"published":"2025-12-09","updated":"2026-10-14","sourceUpdated":"2026-10-14T21:10:00.183","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2025-34401","references":[{"url":"https://mailenable.com/Standard-ReleaseNotes.txt","label":"disclosure@vulncheck.com"},{"url":"https://www.mailenable.com/","label":"disclosure@vulncheck.com"},{"url":"https://www.vulncheck.com/advisories/mailenable-reflected-xss-in-fieldbcc-parameter-of-addressbook-aspx","label":"disclosure@vulncheck.com"}],"tags":["nvd"],"epss":0.00395,"epssPercentile":0.31973,"ingestedAt":"2026-10-14T21:57:04.753Z","slug":"CVE-2025-34401","body":"## Overview\n\nMailEnable versions prior to 10.54 contain a reflected cross-site scripting (XSS) vulnerability in the FieldBcc parameter of /Mondo/lang/sys/Forms/AddressBook.aspx. The FieldBcc value is not properly sanitized when processed via a GET request and is reflected inside a <script> block in the JavaScript variable var BCCFieldProvided. By supplying a crafted payload that terminates the existing LoadCurAddresses() function, inserts attacker-controlled script, and comments out remaining code, a remote attacker can execute arbitrary JavaScript in a victim’s browser during normal email composition. Successful exploitation can redirect victims to malicious sites, steal non-HttpOnly cookies, inject arbitrary HTML or CSS, and perform actions as the authenticated user.\n\n## Affected\n\n- `mailenable < 10.54`\n\n## Remediation\n\nUpgrade past the affected range:\n\n- `mailenable 10.54`","depth":"sunlit","depthScore":34,"depthScoreParts":{"impact":33.6,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[]}