CVE-2026-35539 | THREATINT

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.

PUBLISHED Reserved 2026-04-03 | Published 2026-04-03 | Updated 2026-04-03 | Assigner mitre

MEDIUM: 6.1CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

Problem types

CWE-79 Improper Neutralization of Input During Web Page Generation (XSS or 'Cross-site Scripting')

Product status

Default status

unaffected

Any version before 1.5.14

affected

1.6.0 (semver) before 1.6.14

affected

References

roundcube.net/...3/18/security-updates-1.7-rc5-1.6.14-1.5.14

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

github.com/...ommit/1b30edf5369668c92fe91dae3d52e477c808aa4f

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

github.com/...ommit/10a6d1fa8acac85c727b0a6ae4a6642bfa27bea1

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

github.com/...ommit/d742954ccbcdee7020f8f2e7c49ce0fca5a0efab

cve.org (CVE-2026-35539)

nvd.nist.gov (CVE-2026-35539)

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