CVE-2026-35543 Roundcube Webmail: Bypass of remote image blocking via SVG content (with animate attributes) in an e-mail message
Attackers can bypass remote image blocking in Roundcube Webmail using SVG animations, potentially leading to information disclosure or access-control bypass.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-35543?
CVE-2026-35543 is a medium-severity vulnerability in Roundcube Webmail, published on 3 Apr 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
An issue was discovered in Roundcube Webmail before 1.5.14 and 1.6.14. The remote image blocking feature can be bypassed via SVG content (with animate attributes) in an e-mail message. This may lead to information disclosure or access-control bypass.
Weakness: CWE-669
Which versions are affected by CVE-2026-35543?
2 open source packages ship an affected version, including roundcube/roundcubemail. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
roundcube/roundcubemail Packagist | From 1.7-beta | 1.7-rc5 |
roundcube/roundcubemail Packagist | From 1.7-beta | 1.7-rc5 |
Products include Roundcube Webmail.
How do I fix CVE-2026-35543?
Upgrade roundcube/roundcubemail to 1.7-rc5 or later.
Is CVE-2026-35543 being exploited?
There is no known exploitation of CVE-2026-35543 in the wild and no public exploit code.
Other vulnerabilities in Roundcube Webmail
Sources
Also known as DEBIAN-CVE-2026-35543, GHSA-j2g6-8rvg-7mf6, UBUNTU-CVE-2026-35543.