by Kastro
Paper/Archive/CVE-2026-54433

CVE-2026-54433

Roundcube Webmail — 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 mess…

EPSS 0.3%CVSS 10.0
critical.is priorityof 100
35
CVSS 10.0 (NVD)10.0 / 10 × 3030.0Not in CISA KEV+300.0EPSS percentile 24.0.240 × 204.8No public exploit+100.0SSVC exploitation: none+100.0
Description · from the CVE record

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

ProductAffectedFixed inSource
Webmail1.6.0 – < 1.6.171.6.17CNA
Webmail1.7.0 – < 1.7.21.7.2CNA

Scores by source

NVD10.0CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:N
mitre (CNA)7.2CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N
CISA ADPSSVCExploitation: none · Automatable: yes · Technical impact: partial

References

refroundcube.net/news/2026/07/05/security-updates-1.6.17-and-1.7.2