CVE-2026-35544 describes an insufficient CSS sanitization vulnerability affecting Roundcube Webmail versions prior to 1.5.14 and 1.6.14. This flaw allows a fixed-position mitigation bypass in HTML e-mail messages through the use of "!important" in CSS. Rated with a CVSSv3.1 score of 5.3 (Medium), it has a network attack vector, low attack complexity, and requires no user interaction. The potential impact is limited to low integrity, specifically bypassing a security control, with no direct confidentiality or availability impact. There is currently no evidence of active exploitation, no public exploit code available, and minimal community attention or media coverage.
| Vendor | Product | Version(s) | CPE |
|---|---|---|---|
<= 1.5.13CPE matchmatch criteria | cpe:2.3:a:roundcube:webmail:*:*:*:*:*:*:*:* | ||
>= 1.6.0, <= 1.6.13CPE matchmatch criteria | cpe:2.3:a:roundcube:webmail:*:*:*:*:*:*:*:* | ||
>= 0, < 1.5.14CPE match | cpe:2.3:a:roundcube:webmail:*:*:*:*:*:*:*:* | ||
>= 1.6.0, < 1.6.14CPE match | cpe:2.3:a:roundcube:webmail:*:*:*:*:*:*:*:* |
CVSS version used by this source: 3.1
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.0 Mastodon, and 0.4 GitHub mentions.
No media coverage found for this CVE.
The average CVE in this peer group has 0.0 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.