CVE-2026-35539

6.1 MEDIUM

Published: April 03, 2026 Modified: April 07, 2026

Description

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.

AI Explanation

Get an AI-powered plain-language explanation of this vulnerability and remediation steps.

CVSS v3.x Details

0.0 Low Medium High Critical 10.0

Vector String

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

References to Advisories, Solutions, and Tools

Patch Vendor Advisory Exploit Third Party Advisory

https://github.com/roundcube/roundcubemail/commit/10a6d1fa8acac85c727b0a6ae4a6642bfa27bea1

Source: cve@mitre.org

Patch

https://github.com/roundcube/roundcubemail/commit/1b30edf5369668c92fe91dae3d52e477c808aa4f

Source: cve@mitre.org

Patch

https://github.com/roundcube/roundcubemail/commit/d742954ccbcdee7020f8f2e7c49ce0fca5a0efab

Source: cve@mitre.org

Patch

https://github.com/roundcube/roundcubemail/releases/tag/1.5.14

Source: cve@mitre.org

Release Notes

https://github.com/roundcube/roundcubemail/releases/tag/1.6.14

Source: cve@mitre.org

Release Notes

https://github.com/roundcube/roundcubemail/releases/tag/1.7-rc5

Source: cve@mitre.org

Release Notes

https://roundcube.net/news/2026/03/18/security-updates-1.7-rc5-1.6.14-1.5.14

Source: cve@mitre.org

Vendor Advisory

7 reference(s) from NVD

Quick Stats

CVSS v3 Score

6.1 / 10.0

EPSS (Exploit Probability)

0.0%

12th percentile

Exploitation Status

Not in CISA KEV

Weaknesses (CWE)

CWE-79

Affected Vendors

roundcube

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