Note: Message originally sent on 2026-08-09, but not delivered because
of the mailing list issues.
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:
- Add basic validation for content proxied by the css proxy
- Fix SSRF bypass via specific local address URLs using 100.64.0.0/10
and fe80::/10 nets, reported by Dmytro Ivanenko
- Fix SSRF filter bypass via various forms of nip.io/sslip.io hostnames
evading is_local_url() check, reported by Milan Hoppe
- Fix remote content blocking bypass via unclosed url() in a FuncIRI
attribute, reported by Milan Hoppe
- Fix LDAP filter injection via unescaped %u/%fu/%d substitution into
the `search_filter`, reported by Milan Hoppe
- Fix arbitrary Sieve script injection via a filter rule name bypassing
`managesieve_disabled_actions`, reported by Milan Hoppe
- Fix RCE via cmd_learn driver of markasjunk plugin, reported by nept1337
- Fix IMAP command injection via mail search and LITERAL+ byte-count
desynchronization, reported by Zach Hanley of Horizon3.ai
- Fix password's modoboa driver leak of an authentication token to a
user-controlled host, reported by meifukun
- Fix stored XSS in "Add to address book" action, reported by Paulos
Yibelo from pwn.ai
- Fix HTML/CSS sanitization bypass via SVG animate `by` attribute,
reported by vectrain
See the full changelogs in the release notes on the Github download
pages for the updated versions.
https://github.com/roundcube/roundcubemail/releases/tag/1.7.3https://github.com/roundcube/roundcubemail/releases/tag/1.6.18
We strongly recommend to update all productive installations of
Roundcube 1.6.x and 1.7.x with this new versions.
--
Alec
