CVE-2026-35539 MEDIUM

CVE-2026-35539

Vendor Roundcube

Product Webmail

Weakness CWE-79 · XSS

Published April 3, 2026

Last update April 3, 2026

View on NVD All CVEs

CVSS base score

6.1/10

Attack vector Network

Attack complexity Low

Privileges required None

User interaction Required

Confidentiality Low

Integrity Low

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

What the vulnerability does

01Description

An issue was discovered in Roundcube Webmail before 1.5.14 and 1.6.14. XSS exists because of insufficient HTML attachment sanitization in preview mode. A victim must preview a text/html attachment.

Key dates

02Disclosure timeline

April 3, 2026 CVE published

April 3, 2026 Record updated

External resources

03References

NVD — National Vulnerability Database https://nvd.nist.gov/vuln/detail/CVE-2026-35539 CWE — Common Weakness Enumeration https://cwe.mitre.org/data/definitions/79.html

Related vulnerabilities

Identifiers

CVE CVE-2026-35539

CWE CWE-79

CVSS 6.1 / MEDIUM

Affected versions

Vendor Roundcube

Product Webmail

Affected < 1.5.14

Vendor Roundcube

Product Webmail

Affected ≥ 1.6.0 and < 1.6.14

CVE-2026-35539

01Description

02Disclosure timeline

03References

04Related CVE