CVE-2026-48849 Cross-site scripting in Webmail
Attackers can inject malicious scripts via unsanitized subject fields in restored drafts, affecting shared mailboxes in Roundcube Webmail.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- Available
What is CVE-2026-48849?
CVE-2026-48849 is a medium-severity cross-site scripting vulnerability in Roundcube Webmail, published on 25 May 2026. Any signed-in user can exploit it over the network, and only if a user opens a file or follows a link.
Official description
In Roundcube Webmail 1.6.x before 1.6.16 and 1.7.x before 1.7.1, an unsanitized subject field in the draft restored value could lead to stored XSS/HTML/CSS injection on shared mailboxes.
Weakness: CWE-79
Which versions are affected by CVE-2026-48849?
How do I fix CVE-2026-48849?
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-2026-48849 being exploited?
There is no known exploitation of CVE-2026-48849 in the wild and no public exploit code.
Public exploit code: 1 proofs of concept on GitHub.
Sources
Also known as DEBIAN-CVE-2026-48849, GHSA-2m7q-4j9m-89vh, UBUNTU-CVE-2026-48849.