In Roundcube Webmail before 1.6.18 and 1.7.x before 1.7.3, responses from the CSS (Cascading Style Sheets) proxy were not validated, which may result in information disclosure or XSS (cross-site scripting) via MIME sniffing.
Metrics
Affected Vendors & Products
References
History
Mon, 17 Aug 2026 15:15:00 +0000
| Type | Values Removed | Values Added |
|---|---|---|
| Title | Unvalidated CSS Proxy Response Causing XSS and Information Disclosure in Roundcube Webmail |
Mon, 17 Aug 2026 13:00:00 +0000
| Type | Values Removed | Values Added |
|---|---|---|
| Description | In Roundcube Webmail before 1.6.18 and 1.7.x before 1.7.3, responses from the CSS (Cascading Style Sheets) proxy were not validated, which may result in information disclosure or XSS (cross-site scripting) via MIME sniffing. | |
| First Time appeared |
Roundcube
Roundcube webmail |
|
| Weaknesses | CWE-79 | |
| CPEs | cpe:2.3:a:roundcube:webmail:*:*:*:*:*:*:*:* | |
| Vendors & Products |
Roundcube
Roundcube webmail |
|
| References |
|
|
| Metrics |
cvssV3_1
|
Status: PUBLISHED
Assigner: mitre
Published:
Updated: 2026-08-17T16:01:16.269Z
Reserved: 2026-08-17T12:40:29.556Z
Link: CVE-2026-74998
No data.
Status : Received
Published: 2026-08-17T13:16:54.270
Modified: 2026-08-17T16:17:51.297
Link: CVE-2026-74998
No data.
OpenCVE Enrichment
Updated: 2026-08-17T15:00:08Z