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CVE-2026-35539mediumCWE-79

CVE-2026-35539

13Vexday Risk Score

No sign of exploitation. No public exploitation artifact known so far.

ssvc Trackcvss 6.1epss 0.3%
exploitation probability
0.3%top 83% of all CVEs
observed exploitation
nono source reports it
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.
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
Affected products
Roundcube · Webmail
References
https://github.com/roundcube/roundcubemail/commit/10a6d1fa8acac85c727b0a6ae4a6642bfa27bea1https://github.com/roundcube/roundcubemail/commit/1b30edf5369668c92fe91dae3d52e477c808aa4fhttps://github.com/roundcube/roundcubemail/commit/d742954ccbcdee7020f8f2e7c49ce0fca5a0efabhttps://github.com/roundcube/roundcubemail/releases/tag/1.5.14https://github.com/roundcube/roundcubemail/releases/tag/1.6.14https://github.com/roundcube/roundcubemail/releases/tag/1.7-rc5https://roundcube.net/news/2026/03/18/security-updates-1.7-rc5-1.6.14-1.5.14