We just published security updates to the 1.7 and 1.6 LTS versions of Roundcube Webmail. They both contain fixes for recently reported security vulnerabilities.

Security fixes:

• Fix an infinite loop in TNEF (winmail.dat) decoder (#10193), reported

by stafra.

• Fix various vulnerabilities in the password plugin using

session-injected username, reported by Glendaenri and peppersghost.

• Fix stored XSS via unescaped attachment MIME type on the

attachment-validation warning page [CVE-2026-54432], reported by Bohdan Kurinnoy, Samsung R&D Institute Ukraine (SRUKR).

• Fix SSRF bypass via specific local address URLs - two new cases,

reported by Leenear.

• Fix zero-click stored XSS in plain-text rendering [CVE-2026-54433],

reported by Bohdan Kurinnoy, Samsung R&D Institute Ukraine (SRUKR).

• Fix DoS via crafted compressed-RTF size in the TNEF (winmail.dat)

file, reported by h0rk1p.

See the full changelogs in the release notes on the Github download pages for the updated versions.

https://github.com/roundcube/roundcubemail/releases/tag/1.7.2 https://github.com/roundcube/roundcubemail/releases/tag/1.6.17

We strongly recommend to update all productive installations of Roundcube 1.6.x and 1.7.x with this new versions.