# CVE-2025-49113: Roundcube Webmail Vulnerable to Authenticated RCE via PHP Object Deserialization

Source: https://junglewise.ai/threats/cve-2025-49113-roundcube-webmail-php-deserialization-in-upload-php  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2025-06-02. Updated: 2026-05-15  
License: CC BY 4.0 with a link back

CVE-2025-49113 · Severity: critical · CVSS 3.1 · Exploited in the wild · Published 2025-06-02

Roundcube Webmail, a widely used open-source email client, contains a critical security flaw that allows attackers to take full control of the mail server. By sending a specially crafted web request, an authenticated user can execute malicious commands on the underlying system. This vulnerability is currently being exploited in the wild and could lead to total data theft or service disruption.

Technologies: [roundcube/roundcubemail (Packagist)](https://junglewise.ai/threats/technologies/roundcube-roundcubemail), [Roundcube Webmail](https://junglewise.ai/threats/technologies/webmail). Vendors: [Packagist](https://junglewise.ai/threats/vendors/packagist), [Roundcube](https://junglewise.ai/threats/vendors/roundcube).

## Quick answers

**Is CVE-2025-49113 exploited in the wild?** Yes. CVE-2025-49113 is known to be exploited in the wild, first recorded on 20 February 2026. Treat it as urgent.

**How severe is CVE-2025-49113?** Critical severity, with a CVSS score of 3.1, published 2 June 2025.

**Which products and versions are affected?** roundcube/roundcubemail (Packagist) ECOSYSTEM:introduced=0,fixed=1.5.10; Roundcube Webmail before 1.5.10, 1.6.x before 1.6.11.

**Is there a fix for CVE-2025-49113?** Yes. roundcube/roundcubemail (Packagist): upgrade to 1.5.10 or later. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**How is CVE-2025-49113 attacked?** It is attacked over the network, in a network appliance.

**Am I affected by CVE-2025-49113?** Check whether you run roundcube/roundcubemail (Packagist) or Roundcube Webmail at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## How to fix

- roundcube/roundcubemail (Packagist): upgrade to 1.5.10 or later

  ```sh
  composer require roundcube/roundcubemail:^1.5.10
  ```


## Technical details

A PHP Object Deserialization vulnerability exists in Roundcube Webmail's 'upload.php' component due to insufficient validation of the '_from' URL parameter. An authenticated attacker can exploit this by providing a malicious serialized object, which the application then processes, leading to arbitrary remote code execution (RCE). The vulnerability affects versions prior to 1.5.10 and the 1.6.x branch prior to 1.6.11. This flaw is listed in CISA's Known Exploited Vulnerabilities (KEV) catalog, indicating active exploitation. Patches are available in versions 1.5.10 and 1.6.11.

## Affected products

- Roundcube Webmail before 1.5.10, 1.6.x before 1.6.11

## Identifiers

- CVE-2025-49113
- GHSA-8j8w-wwqc-x596

## Timeline

- 2025-06-01: patched: Vendor released security updates 1.6.11 and 1.5.10
- 2025-12-22: disclosed: Initial NVD analysis published
- 2026-02-20: kev added: CISA added to Known Exploited Vulnerabilities catalog

## Related threats

- [Roundcube Webmail improper authentication in multi-host installations](https://junglewise.ai/threats/cve-2026-114732-roundcube-webmail-before-1-6-20-and-1-7-x-before-1-7-5-is)
- [Roundcube Webmail uncontrolled resource consumption in CSS proxy](https://junglewise.ai/threats/cve-2026-114731-roundcube-webmail-before-1-6-20-and-1-7-x-before-1-7-5-is)
- [Roundcube Webmail server-side request forgery filter bypass](https://junglewise.ai/threats/cve-2026-114730-roundcube-webmail-1-6-14-before-1-6-20-and-1-7-0-before-1-7-5-is)
- [Roundcube Webmail content blocking bypass via SVG SMIL](https://junglewise.ai/threats/cve-2026-114729-roundcube-webmail-before-1-6-20-and-1-7-x-before-1-7-5-is)
- [Roundcube Webmail remote content blocking bypass in CSS FuncIRI handling](https://junglewise.ai/threats/cve-2026-114728-roundcube-webmail-before-1-6-20-and-1-7-x-before-1-7-5-is)