What is GHSA-x4q5-8j5g-hpjc?

GHSA-x4q5-8j5g-hpjc is a security advisory published by GitHub Security Advisories with Medium severity. Roundcube Webmail: Insufficient HTML attachment sanitization in preview mode

Which CVE IDs does GHSA-x4q5-8j5g-hpjc cover?

GHSA-x4q5-8j5g-hpjc covers the following CVE IDs: CVE-2026-35539. Each CVE has its own detail page on EchelonGraph Pulse with the synthesized EG score.

What is the CVSS v3 score of GHSA-x4q5-8j5g-hpjc?

GHSA-x4q5-8j5g-hpjc has a CVSS v3 base score of 6.1, published by GitHub Security Advisories.

Which products are affected by GHSA-x4q5-8j5g-hpjc?

GHSA-x4q5-8j5g-hpjc affects 1 product, including: composer/roundcube/roundcubemail:\u003e= 1.7-beta, \u003c 1.7-rc5.

GHSA-x4q5-8j5g-hpjcMediumCVSS 6.1

Roundcube Webmail: Insufficient HTML attachment sanitization in preview mode

Vendor

GitHub Security Advisories

Published

April 3, 2026

Last Modified

April 4, 2026

🔗 CVE IDs covered (1)

CVE-2026-35539 →

📋 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.

🎯 Affected products1

composer/roundcube/roundcubemail:>= 1.7-beta, < 1.7-rc5

🔗 References (9)

https://nvd.nist.gov/vuln/detail/CVE-2026-35539
https://github.com/roundcube/roundcubemail/commit/10a6d1fa8acac85c727b0a6ae4a6642bfa27bea1
https://github.com/roundcube/roundcubemail/commit/1b30edf5369668c92fe91dae3d52e477c808aa4f
https://github.com/roundcube/roundcubemail/commit/d742954ccbcdee7020f8f2e7c49ce0fca5a0efab
https://github.com/roundcube/roundcubemail/releases/tag/1.5.14
https://github.com/roundcube/roundcubemail/releases/tag/1.6.14
https://github.com/roundcube/roundcubemail/releases/tag/1.7-rc5
https://roundcube.net/news/2026/03/18/security-updates-1.7-rc5-1.6.14-1.5.14
https://github.com/advisories/GHSA-x4q5-8j5g-hpjc