CVE-2026-74998CWE-79cross-site-scripting

CVE-2026-74998

High · published August 17, 2026

CVSS v3.1
7.2
EPSS
0%
Percentile
37.0
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v3.1
7.2 · HIGH
Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N
CVSS v4.0
Not supplied
EPSS
0.00438 · 37.0th percentile
Weakness
CWE-79 · Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
Published
2026-08-17T17:16Z
Affected products (2)
ProductVersionsFixed in
roundcube/webmail≥ 1.6.0, < 1.6.181.6.18
roundcube/webmail≥ 1.7.0, < 1.7.31.7.3
References (5)
https://github.com/roundcube/roundcubemail/commit/62d33c8a0dc3fd0dd03984220dc9709e8e0de43b · [email protected]https://github.com/roundcube/roundcubemail/commit/a2334990c02f7cb77b1a8d6fa97fcd9e1b5cd1fb · [email protected]https://github.com/roundcube/roundcubemail/releases/tag/1.6.18 · [email protected]https://github.com/roundcube/roundcubemail/releases/tag/1.7.3 · [email protected]https://roundcube.net/news/2026/08/09/security-updates-1.6.18-and-1.7.3 · [email protected]
EPSS history
Timeline
  • 17 AUG 12:40Z
    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…
    cvelistv5