PT-2026-29982 · Roundcube+1 · Roundcube Webmail+1

Nullcathedral · Published 2026-03-18 · Updated 2026-05-07 · CVE-2026-35543

Positive Technologies (AI Summary)

CVSS v3.1

5.3

Medium

Base vector

AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

Name of the Vulnerable Software and Affected Versions Roundcube Webmail versions prior to 1.5.14 and prior to 1.6.14

Description A flaw exists in Roundcube Webmail that allows bypassing the remote image blocking feature. This bypass is achieved through specially crafted SVG content, specifically utilizing animate attributes within an email message. Successful exploitation could lead to information disclosure or access-control bypass.

Recommendations Update Roundcube Webmail to version 1.5.14 or later. Update Roundcube Webmail to version 1.6.14 or later.

Fix

Weakness Enumeration

CWE-669

Related Identifiers

BDU:2026-06324

CVE-2026-35543

GHSA-J2G6-8RVG-7MF6

Affected Products

Red Os

Roundcube Webmail

References · 21

• https://github.com/roundcube/roundcubemail/commit/39471343ee081ce1d31696c456a2c163462daae3 · Patch
• https://github.com/roundcube/roundcubemail/commit/1a63e01542bff42aaa71c00c4c279a09ef31f20c · Patch
• https://github.com/roundcube/roundcubemail/commit/82ab5eca7b332fce7a174b2b987f0957a66377cd · Patch
• https://ubuntu.com/security/CVE-2026-35543 · Vendor Advisory
• https://cve.org/CVERecord?id=CVE-2026-35543 · Security Note
• https://roundcube.net/news/2026/03/18/security-updates-1.7-rc5-1.6.14-1.5.14 · Vendor Advisory
• https://osv.dev/vulnerability/GHSA-j2g6-8rvg-7mf6 · Vendor Advisory
• https://osv.dev/vulnerability/UBUNTU-CVE-2026-35543 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2026-35543 · Security Note
• https://security-tracker.debian.org/tracker/CVE-2026-35543 · Vendor Advisory
• https://bdu.fstec.ru/vul/2026-06324 · Security Note
• https://osv.dev/vulnerability/DEBIAN-CVE-2026-35543 · Vendor Advisory
• https://github.com/roundcube/roundcubemail/releases/tag/1.7-rc5 · Note
• https://github.com/roundcube/roundcubemail/releases/tag/1.5.14 · Note
• https://github.com/roundcube/roundcubemail/releases/tag/1.6.14 · Note