CVE-2026-48846 Security feature bypass in Webmail
Attackers can bypass remote image blocking in Roundcube Webmail via crafted CSS, 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-2026-48846?
CVE-2026-48846 is a medium-severity vulnerability in Roundcube Webmail, published on 25 May 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
In Roundcube Webmail 1.6.x before 1.6.16 and 1.7.x before 1.7.1, the remote image blocking feature can be bypassed via a crafted CSS var() value in an e-mail message, which may lead to information disclosure or access-control bypass.
Weakness: CWE-669
Which versions are affected by CVE-2026-48846?
How do I fix CVE-2026-48846?
Upgrade to a fixed version.
Is CVE-2026-48846 being exploited?
There is no known exploitation of CVE-2026-48846 in the wild and no public exploit code.
Sources
Also known as DEBIAN-CVE-2026-48846, GHSA-xx87-33v7-6x23, UBUNTU-CVE-2026-48846.