Roundcube Webmail up to 1.6.15/1.7.0 cross site scripting

Summaryinfo

A vulnerability classified as problematic was found in Roundcube Webmail up to 1.6.15/1.7.0. Impacted is an unknown function. The manipulation results in cross site scripting. This vulnerability was named CVE-2026-48849. The attack may be performed from remote. There is no available exploit. Upgrading the affected component is advised.

Detailsinfo

A vulnerability was found in Roundcube Webmail up to 1.6.15/1.7.0. It has been classified as problematic. Affected is an unknown function. The manipulation with an unknown input leads to a cross site scripting vulnerability. CWE is classifying the issue as CWE-79. The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users. This is going to have an impact on integrity. CVE summarizes:

In Roundcube Webmail 1.6.x before 1.6.16 and 1.7.x before 1.7.1, an unsanitized subject field in the draft restored value could lead to stored XSS/HTML/CSS injection on shared mailboxes.

The advisory is shared for download at roundcube.net. This vulnerability is traded as CVE-2026-48849 since 05/25/2026. The exploitability is told to be easy. It is possible to launch the attack remotely. Successful exploitation requires user interaction by the victim. There are neither technical details nor an exploit publicly available. The MITRE ATT&CK project declares the attack technique as T1059.007.

The vulnerability scanner Nessus provides a plugin with the ID 316793 (Linux Distros Unpatched Vulnerability : CVE-2026-48849), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 1.6.16 or 1.7.1 eliminates this vulnerability. The upgrade is hosted for download at github.com. Applying the patch 189d30a4890319cd687df959ca9f768a3a613d61 is able to eliminate this problem. The bugfix is ready for download at github.com. The best possible mitigation is suggested to be upgrading to the latest version.

The vulnerability is also documented in the vulnerability database at Tenable (316793). VulDB is the best source for vulnerability data and more expert information about this specific topic.

Productinfo

Type

• Mail Client Software

Vendor

• Roundcube

Name

• Webmail

Version

• 1.0
• 1.1
• 1.2
• 1.3
• 1.4
• 1.5
• 1.6
• 1.6.0
• 1.6.1
• 1.6.2
• 1.6.3
• 1.6.4
• 1.6.5
• 1.6.6
• 1.6.7
• 1.6.8
• 1.6.9
• 1.6.10
• 1.6.11
• 1.6.12
• 1.6.13
• 1.6.14
• 1.6.15
• 1.7.0

License

• free

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CPE 2.2info

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VulDB is the best source for vulnerability data and more expert information about this specific topic.

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