oss-security - Roundcube webmail: Many security fixes in 1.6.18 / 1.7.3

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Message-ID: <20260810093339.6de7b3e7@hboeck.de>
Date: Mon, 10 Aug 2026 09:33:39 +0200
From: Hanno Böck <hanno@...eck.de>
To: oss-security@...ts.openwall.com
Subject: Roundcube webmail: Many security fixes in 1.6.18 / 1.7.3

Release announcement from Roundcube Webmail:
https://roundcube.net/news/2026/08/09/security-updates-1.6.18-and-1.7.3

## 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](https://github.com/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
[1.6.18](https://github.com/roundcube/roundcubemail/releases/tag/1.6.18)
and
[1.7.3](https://github.com/roundcube/roundcubemail/releases/tag/1.7.3).

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

URL:
https://roundcube.net/news/2026/08/09/security-updates-1.6.18-and-1.7.3



-- 
Hanno Böck - Independent security researcher
https://itsec.hboeck.de/
https://badkeys.info/

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