CyberRota Analysis
AI-GeneratedThe vulnerability affects Horde IMP's AppleDouble MIME viewer, which improperly handles attacker-controlled attachment names, allowing for potential cross-site scripting (XSS) attacks. This flaw enables an attacker to craft a malicious email that, when viewed, executes scripts in the context of the user, with the payload persisting in the mailbox. Organizations using affected versions of Horde IMP should prioritize patching this vulnerability, especially those with users who frequently interact with email attachments.
Public Exploit Signal
A public exploit, PoC, GitHub repository or Metasploit reference was detected for this CVE.
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Original NVD Description
Horde IMP's AppleDouble MIME viewer writes an attacker-controlled attachment name into an HTML status block without escaping it. In lib/Mime/Viewer/Appledouble.php, _IMPrender() obtains the name of the data part with IMP_Contents::getPartName(), which returns the MIME part's own name parameter as supplied by the message, and passes it through sprintf into the text of an IMP_Mime_Status object. IMP_Mime_Status::__toString() concatenates each text entry directly into the surrounding table markup, so the value reaches the rendered page verbatim. A message crafted as multipart/appledouble whose data part carries markup in its name parameter therefore executes script in the context of any user who views it, and the payload persists in the mailbox. Exploitation requires no account on the target system, only the ability to send mail to a user. Version 7.2.0 escapes the value with htmlspecialchars(). The researcher additionally chains this flaw with the arbitrary file read of CVE-2026-58451, and reports that script running in an administrator's session can reach an application code-execution path.