What is CVE-2026-48849?

CVE-2026-48849 is a medium-severity vulnerability in Roundcube Webmail, classified under Cross-site Scripting. CVSS score: 4.4/10. Published 2026-05-25.

How severe is CVE-2026-48849?

Medium severity. CVSS v3 base score is 4.4 out of 10.

XSS in Roundcube Webmail

CVE-2026-48849

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.

Vulnerability class: XSS (Cross-Site Scripting)

EPSS: 0.000 (10.0th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 4.4 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:C/C:L/I:L/A:N.

Affected products

Roundcube Webmail — versions 1.6.0, 1.7.0

Weakness classification (CWE)

CWE-79 — Cross-site Scripting

References

cve@mitre.org
cve@mitre.org
cve@mitre.org
cve@mitre.org
cve@mitre.org

Frequently asked questions

What is CVE-2026-48849?: CVE-2026-48849 is a medium-severity vulnerability in Roundcube Webmail, classified under Cross-site Scripting. CVSS score: 4.4/10. Published 2026-05-25.
How severe is CVE-2026-48849?: Medium severity. CVSS v3 base score is 4.4 out of 10.