---
id: CVE-2026-58451
title: Horde IMP < 7.0.1 Path Traversal via Compose.php img src
summary: >-
  Horde IMP before 7.0.1 contains a path traversal vulnerability in
  lib/Compose.php that allows authenticated attackers to read arbitrary files
  from the server filesystem by embedding traversal sequences after a CKEditor
  path prefix in img…
severity: medium
cvss: 6.5
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N'
cvssSource: cna
cwe:
  - CWE-22
vendor: horde
product: imp
affected:
  - imp < 7.0.1
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-07-01T18:41:12.206279Z'
published: '2026-07-01'
updated: '2026-11-08'
sourceUpdated: '2026-11-08T14:07:03.667Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-58451'
references:
  - url: 'https://github.com/horde/imp/releases/tag/v7.0.1'
    label: imp 7.0.1 Release Notes
  - url: 'https://github.com/horde/imp/pull/85'
    label: Fix PR
  - url: >-
      https://github.com/horde/imp/commit/fba972fab72ee6871e5d56e6390bee38593085de
    label: Fix Commit
  - url: 'https://www.horde.org/apps/imp'
    label: Project Webpage
  - url: >-
      https://www.vulncheck.com/advisories/horde-imp-path-traversal-via-compose-php-img-src
  - url: 'https://blog.evan.lat/posts/CVE-2026-58451/'
    label: Researcher Disclosure
tags:
  - cve.org
epss: 0.00564
epssPercentile: 0.47144
ingestedAt: '2026-11-08T14:51:22.291Z'
---

## Overview

Horde IMP before 7.0.1 contains a path traversal vulnerability in lib/Compose.php that allows authenticated attackers to read arbitrary files from the server filesystem by embedding traversal sequences after a CKEditor path prefix in img src URLs. Attackers can bypass the stripos() prefix validation by appending sequences such as traversal segments after the matching prefix, causing file_get_contents() to read sensitive files whose contents are then exfiltrated as MIME parts in outgoing email; unauthenticated exploitation is also achievable via CSRF against an active authenticated session.

## Affected

- `imp < 7.0.1`

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.