Vulnerability · Published Jul 14, 2026 · Assigned by mitre
CVE-2026-54433
High 7.2
In plain English
A high-severity cross-site scripting in Webmail from Roundcube. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 32% of all known vulnerabilities). Ready-made attack tooling exists: public proof-of-concept code. Fixed versions are available - upgrade the affected package.
Official description
In Roundcube Webmail before 1.6.17 and 1.7.x before 1.7.2, there is Stored Cross-Site Scripting (XSS) via a crafted plain-text email message. The attacker-controlled JavaScript executes within the victim's authenticated session simply by opening or previewing the message (zero-click).
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian:12 | roundcube | 1.6.5+dfsg-1+deb12u10 | DEBIAN-CVE-2026-54433 |
| Debian:13 | roundcube | 1.6.17+dfsg-0+deb13u1 | DEBIAN-CVE-2026-54433 |
| Debian:14 | roundcube | 1.6.17+dfsg-1 | DEBIAN-CVE-2026-54433 |
| Ubuntu:25.10 | roundcube | no fix listed | UBUNTU-CVE-2026-54433 |
| Ubuntu:26.10 | roundcube | no fix listed | UBUNTU-CVE-2026-54433 |
Affected products (as reported)
Weakness: CWE-79 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N