What is CVE-2026-74999?

CVE-2026-74999 is a medium-severity vulnerability in Roundcube Webmail, classified under Cross-site Scripting. CVSS score: 5.4/10. Published 2026-08-17.

How severe is CVE-2026-74999?

Medium severity. CVSS v3 base score is 5.4 out of 10.

XSS in Roundcube Webmail

CVE-2026-74999

In Roundcube Webmail before 1.6.18 and 1.7.x before 1.7.3, the "Add to address book" action was subject to stored XSS.

Vulnerability class: XSS (Cross-Site Scripting)

CVSS v3 metric

CVSS v3 base score 5.4 (Medium). Vector: CVSS:3.1/AV:N/AC:L/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-2026-74999?: CVE-2026-74999 is a medium-severity vulnerability in Roundcube Webmail, classified under Cross-site Scripting. CVSS score: 5.4/10. Published 2026-08-17.
How severe is CVE-2026-74999?: Medium severity. CVSS v3 base score is 5.4 out of 10.