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CVE-2026-65053— Horde IMP before 7.2.0 Stored Cross-Site Scripting via AppleDouble Viewer Part Name

Quick assessment

Affected
horde imp
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Horde imp是Horde组织开源的一个基于 web 的网络邮件系统。 Horde imp 7.2.0之前版本存在跨站脚本漏洞，该漏洞源于AppleDouble MIME viewer将攻击者控制的附件名称写入HTML状态块时未转义，可能导致存储型跨站脚本攻击，在用户上下文中执行脚本。

CVSS 6.1 · Medium EPSS 0.41% · P34

Affected Version Matrix 1

VendorProduct Version RangeStatus
horde imp < 7.2.0 affected
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I. Basic Information for CVE-2026-65053

Vulnerability Information
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Vulnerability Title
Horde IMP before 7.2.0 Stored Cross-Site Scripting via AppleDouble Viewer Part Name
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
在Web页面生成时对输入的转义处理不恰当(跨站脚本)
Source: CVE Program / CVE List V5
Vulnerability Title
Horde imp 跨站脚本漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Horde imp是Horde组织开源的一个基于 web 的网络邮件系统。 Horde imp 7.2.0之前版本存在跨站脚本漏洞，该漏洞源于AppleDouble MIME viewer将攻击者控制的附件名称写入HTML状态块时未转义，可能导致存储型跨站脚本攻击，在用户上下文中执行脚本。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
horde imp 0 ~ 7.2.0 -

II. Public POCs for CVE-2026-65053

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III. Intelligence Information for CVE-2026-65053

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Patches & Fixes for CVE-2026-65053 (2)

Vendor Advisories for CVE-2026-65053 (1)

Security Blog Posts for CVE-2026-65053 (1)

Vendor Pages for CVE-2026-65053 (2)

IV. Related Vulnerabilities

Same product: imp
Same vendor: horde
Same weakness: CWE-79

V. Comments for CVE-2026-65053

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