---
id: CVE-2026-114724
title: >-
  Roundcube Webmail before 1.6.20 and 1.7.x before 1.7.5 contains an object
  injection primitive in rcube_session::unserialize()
summary: >-
  Roundcube Webmail before 1.6.20 and 1.7.x before 1.7.5 contains an object
  injection primitive in rcube_session::unserialize(). A session key prefixed
  with “!” was treated as having no value, and the reconstructed serialized
  string was em…
severity: high
cvss: 7.4
cvssVector: 'CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H'
cvssSource: cna
cwe:
  - CWE-502
vendor: Roundcube
product: Webmail
affected:
  - Webmail >= 1.6.0 < 1.6.20
  - Webmail >= 1.7.0 < 1.7.5
published: '2026-10-22'
updated: '2026-10-22'
sourceUpdated: '2026-10-22T01:48:23.338Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-114724'
references:
  - url: 'https://bugs.debian.org/1151279'
  - url: >-
      https://github.com/roundcube/roundcubemail/commit/93284f3f0e13f99af37fc3b81861e142eea8a922
  - url: 'https://roundcube.net/news/2026/10/19/security-updates-1.6.20-and-1.7.5'
  - url: 'https://github.com/roundcube/roundcubemail/releases/tag/1.7.5'
  - url: 'https://github.com/roundcube/roundcubemail/releases/tag/1.6.20'
  - url: >-
      https://github.com/roundcube/roundcubemail/commit/833770d3d3c35cfde74cc2614d368f25a75b6f99
tags:
  - cve.org
ingestedAt: '2026-10-22T02:23:25.181Z'
---

## Overview

Roundcube Webmail before 1.6.20 and 1.7.x before 1.7.5 contains an object injection primitive in rcube_session::unserialize(). A session key prefixed with “!” was treated as having no value, and the reconstructed serialized string was emitted with a key but no corresponding value, desynchronizing the remainder of the input so that following session data was interpreted as a serialized value. This yields a PHP object injection primitive for an attacker able to influence stored session data. Upstream fixed this in the commit “Fix object injection primitive in rcube_session::unserialize() via “!”-prefixed session keys”, which rejects such keys.

## Affected

- `Webmail >= 1.6.0 < 1.6.20`
- `Webmail >= 1.7.0 < 1.7.5`

## Remediation

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