CVE-2026-48843
Cross-Site Scripting in Roundcube Webmail
Publication date: 2026-05-25
Last updated on: 2026-05-25
Assigner: MITRE
Description
Description
CVSS Scores
EPSS Scores
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Meta Information
Affected Vendors & Products
| Vendor | Product | Version / Range |
|---|---|---|
| roundcube | roundcube | From 1.6.14 (inc) to 1.6.16 (inc) |
| roundcube | roundcube | to 1.7.1 (exc) |
Helpful Resources
Exploitability
| CWE ID | Description |
|---|---|
| CWE-918 | The web server receives a URL or similar request from an upstream component and retrieves the contents of this URL, but it does not sufficiently ensure that the request is being sent to the expected destination. |
Attack-Flow Graph
AI Powered Q&A
Can you explain this vulnerability to me?
This vulnerability affects Roundcube Webmail versions 1.6.x between 1.6.14 and 1.6.16, and 1.7.x before 1.7.1. It is caused by insufficient sanitization of Cascading Style Sheets (CSS) in HTML email messages. Specifically, if stylesheet links in emails point to local network hosts, this flaw may lead to Server-Side Request Forgery (SSRF) or information disclosure. The issue is related to an incomplete fix for a previous vulnerability identified as CVE-2026-35540.
How can this vulnerability impact me? :
The vulnerability can allow attackers to perform SSRF attacks or gain unauthorized access to sensitive information. By exploiting the insufficient CSS sanitization, attackers may cause the server to make unintended requests to internal network hosts or disclose information that should be protected, potentially compromising confidentiality and security.