Ce mail provient de l'extérieur, restons vigilants

=====================================================================


                            CERT-Renater

                Note d'Information No. 2026/VULN1049
_____________________________________________________________________

DATE                : 19/10/2026

HARDWARE PLATFORM(S): /

OPERATING SYSTEM(S): Systems running Roundcube Webmail versions prior
                                      to 1.6.20, 1.7.5.

====================================================================
https://roundcube.net/news/2026/10/19/security-updates-1.6.20-and-1.7.5
_____________________________________________________________________

Security updates 1.6.20 and 1.7.5 released

Published: 19 October 2026

    Tags: releases updates security 

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


Security fixes

    Fix IMAP command injection via CRLF in _uid parameter of
mail/headers and mail/viewsource action, reported by Wahab “NeoX” K.

    Fix bug where an alias login wasn’t qualified by IMAP host,
reported by Milan Hoppe.

    Add a size limit to the CSS proxy content processing, reported by
Milan Hoppe.

    Fix SSRF filter (is_local_url()) bypass via NAT64 64:ff9b::/96,
reported by dizconnect.

    Fix remote content blocking bypass via SVG SMIL by attribute,
reported by Milan Hoppe.

    Fix remote content blocking bypass via CSS escapes in FuncIRI
attributes (again), reported by Milan Hoppe.

    Fix passing potentally unsafe attachment content into ImageMagick
on image resize, reported by Paulos Yibelo

    Fix mail header injection via the From display-name in the Bounce
(resend) action, reported by Clay.

    Fix mail header injection via References/In-Reply-To/Message-ID/From
parameters, reported by Sunil Tripathy.

    Fix object injection primitive in rcube_session::unserialize()
via “!”-prefixed session keys, reported by Oli Z.

    Fix ImageMagick resource limits bypass by GD fallback during
thumbnail generation, reported by GoldenSW.

    Fix CSS scoping bypass in HTML messages using at-rules,
reported by GoldenSW.

    Fix bug where deprecated action aliases bypassed disabled_actions
setting, reported by Squirt1e, Atum, N0b0dy, and Gh0u1L5.

    Fix IMAP command injection via CRLF in _flag parameter of
mail/mark action, reported by Squirt1e, Atum, N0b0dy, and Gh0u1L5.

    Fix CSRF validation bypass in the mark-as-junk action, reported
by Squirt1e, Atum, N0b0dy, and Gh0u1L5.

    Fix XSS issue in handling of password driver error responses,
reported by Squirt1e, Atum, N0b0dy, and Gh0u1L5.

    Fix mail header injection via subject of a message forwarded as
attachment, reported by Squirt1e, Atum, N0b0dy, and Gh0u1L5.

    Fix mail header injection via media type in an inline image
data URI, reported by Squirt1e, Atum, N0b0dy, and Gh0u1L5.

    Fix bug where Password Modoboa driver could change password for
another account, reported by Squirt1e, Atum, N0b0dy, and Gh0u1L5.

    Fix unsafe use of a login name in SquirrelMail import file path,
reported by Squirt1e, Atum, N0b0dy, and Gh0u1L5.

See the full changelogs in the release notes on the Github download
pages for the updated versions 1.6.20 and 1.7.5.

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



=========================================================
+ CERT-RENATER        |    tel : 01-53-94-20-44         +
+ 23/25 Rue Daviel    |    fax : 01-53-94-20-41         +
+ 75013 Paris         |   email:cert@support.renater.fr +
=========================================================