Stored XSS in Roundcube Webmail

Publication date: 2026-05-25

Last updated on: 2026-05-25

Assigner: MITRE

Description

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.

CVSS Scores

EPSS Scores

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Meta Information

Published

2026-05-25

Last Modified

2026-05-25

Generated

2026-07-06

AI Q&A

2026-05-26

EPSS Evaluated

2026-07-04

NVD

CVE-2026-48849

EUVD

EUVD-2026-31728

Affected Vendors & Products

Vendor	Product	Version / Range
roundcube	roundcube	to 1.6.16 (exc)
roundcube	roundcube	to 1.7.1 (exc)

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
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.

Attack-Flow Graph

Executive Summary

This vulnerability exists in Roundcube Webmail versions 1.6.x before 1.6.16 and 1.7.x before 1.7.1. It involves an unsanitized subject field in the draft restored value, which can lead to stored cross-site scripting (XSS) or HTML/CSS injection attacks on shared mailboxes.

Impact Analysis

The vulnerability can allow an attacker to inject malicious scripts or HTML/CSS into the subject field of email drafts in shared mailboxes. This stored XSS can be executed when other users access the affected mailbox, potentially leading to unauthorized actions, data theft, or session hijacking.

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