CVE-2026-26079 Cross-site scripting in Webmail
Attackers can inject malicious CSS into Roundcube Webmail, potentially leading to script execution and account compromise.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- Available
What is CVE-2026-26079?
CVE-2026-26079 is a medium-severity cross-site scripting vulnerability in Roundcube Webmail, published on 11 Feb 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Official description
Roundcube Webmail before 1.5.13 and 1.6 before 1.6.13 allows Cascading Style Sheets (CSS) injection, e.g., because comments are mishandled.
Weakness: CWE-829
Which versions are affected by CVE-2026-26079?
How do I fix CVE-2026-26079?
Upgrade to a fixed version.
Escape output for the context it lands in and set a strict Content Security Policy. Upgrading the affected component is the real fix. More about Cross-site scripting.
Is CVE-2026-26079 being exploited?
There is no known exploitation of CVE-2026-26079 in the wild and no public exploit code.
Sources
Also known as DEBIAN-CVE-2026-26079, GHSA-pw24-qgf8-7qm8, UBUNTU-CVE-2026-26079.