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Security updates 1.7.6 and 1.6.21 released
by Aleksander Machniak 09 Nov '26

09 Nov '26

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 open redirect via IMAP error recovery on attachment get, reported by Santhoshkumar S. - Fix so Received: header includes only trusted hostname and forwarded IP from a trusted proxy, reported by Squirt1e, Atum, N0b0dy, Gh0u1L5. - Fix bug where some managesieve destructive actions could have been triggered cross-site via GET, reported by Squirt1e, Atum, N0b0dy, Gh0u1L5. - Fix Sieve script injection via a rule operator, reported by Squirt1e, Atum, N0b0dy, Gh0u1L5. - Fix Sieve script injection via set/include modifiers, reported by Squirt1e, Atum, N0b0dy, Gh0u1L5. - Fix bug where resolve_url() ignored trusted host setting, reported by Squirt1e, Atum, N0b0dy, Gh0u1L5. - Fix mail header injection via a MDN subject, reported by Squirt1e, Atum, N0b0dy, Gh0u1L5 - Fix HTTP request injection via the spellcheck ATD backend, reported by Squirt1e, Atum, N0b0dy, Gh0u1L5. - Fix IMAP command injection via CRLF in _uid parameter with messages_cache enabled, reported by dexx-tech. - Fix SSRF in CSS proxy via incomplete is_local_url() nip.io/sslip.io bypass, reported by blacksw0rd. - Fix CSRF validation bypass for file-only POST requests, reported by skad00sh. - Fix `disabled_actions` restriction bypass by writing '_' instead of '-' in the action name, reported by skad00sh. - Fix CSRF validation bypass for mail purge/expunge commands, reported by threalwinky. - Fix passing potentally unsafe attachment content into ImageMagick on image type conversion, reported by José Luis Sánchez Pérez - Cybersecurity Blue & Red Team. - Fix Unbounded CPU loop/DoS in rcube_session::unserialize() via a negative length token, reported by Guang. - Fix SSRF filter (is_local_url()) bypass via 6to4 (2002::/16) addresses, reported by wyx98765. - Fix so IMAP host input is validated more strictly, reported by Mohamed Elgzouli. See the full changelogs in the release notes on the Github download pages for the updated versions. https://github.com/roundcube/roundcubemail/releases/tag/1.7.6 https://github.com/roundcube/roundcubemail/releases/tag/1.6.21 We strongly recommend to update all productive installations of Roundcube 1.6.x and 1.7.x with this new versions. WARNING: The 1.6 branch is four years old. Please, plan your upgrade to 1.7 soon. Backporting security patches became increasingly time consuming, annoying and error prone. 1.6 will be discontinued rather soon. -- Alec

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Calendar Plugin Bug / Patch
by list＠ptld.com 08 Nov '26

08 Nov '26

I couldn't see where to report this bug on github, there is no issue tab on the repo. The issue is that when calendar.php decides who to send email notices to, it skips addresses that are in the user's roundcube identities. That skipping of the user ends up canceling the event for that user, because it also skips adding the user to $current. The cancellation code incorrectly treats it as a removed attendee. This should fix it. --- a/plugins/calendar/calendar.php +++ b/plugins/calendar/calendar.php @@ -2505,12 +2505,17 @@ $sent = 0; $current = []; foreach ((array) $event['attendees'] as $attendee) { + if (empty($attendee['email'])) { + continue; + } + + // Track all current attendees, including identities we do not notify. + $current[] = strtolower($attendee['email']); + // skip myself for obvious reasons - if (empty($attendee['email']) || in_array(strtolower($attendee['email']), $emails)) { + if (in_array(strtolower($attendee['email']), $emails)) { continue; } - - $current[] = strtolower($attendee['email']); // skip if notification is disabled for this attendee if (!empty($attendee['noreply']) && $itip_notify & 2) { If i could get an acknowledgement from someone at Kolab, so i don't have to keep trying to find a way to let them know. Thanks.

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Security updates 1.7.5 and 1.6.20 released
by Aleksander Machniak 19 Oct '26

19 Oct '26

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 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. https://github.com/roundcube/roundcubemail/releases/tag/1.7.5 https://github.com/roundcube/roundcubemail/releases/tag/1.6.20 We strongly recommend to update all productive installations of Roundcube 1.6.x and 1.7.x with this new versions. -- Alec

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[Roundcube Announce] Security updates 1.7.4 and 1.6.19 released
by Aleksander Machniak 06 Sep '26

06 Sep '26

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 CSS declaration smuggling via un-encoded ampersand emission, reported by Zach Hanley of Horizon3.ai - Fix CSS property injection via body `background` attribute, reported by zenithhostingevan - Fix email header injection via bare CR in the subject field, reported by CVE-Hunter-Leo - Fix email header injection via C-escape \r in the recipient display name, reported by dogeshark - Fix email header injection via identity's organization field, reported by dogeshark - Fix zero-click stored XSS via TNEF MIME tag injection in the attachment URL, reported by nakko - Fix XSS in the HTML editor using text/enriched part content, reported by Joshua Rogers - Fix cross-user access in contact group membership (add/remove) in the SQL address book, reported by Joshua Rogers - Fix is_local_url() bypass via trailing-dot FQDN in stylesheet URL, reported by nept1337 - Fix remote content blocking bypass via CSS escapes in FuncIRI attributes, reported by neoxed - Fix remote-content blocker bypass via SVG SMIL src animation - Fix SSRF bypass in Roundcube CSS proxy via hexadecimal IPv6-mapped IPv4 addresses, reported by faceless0x7 and Harish Annavisamy See the full changelogs in the release notes on the Github download pages for the updated versions. https://github.com/roundcube/roundcubemail/releases/tag/1.7.4 https://github.com/roundcube/roundcubemail/releases/tag/1.6.19 We strongly recommend to update all productive installations of Roundcube 1.6.x and 1.7.x with this new versions. -- Alec

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Security updates 1.7.3 and 1.6.18 released
by Aleksander Machniak 27 Aug '26

27 Aug '26

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/1.7.3 https://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

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Security updates 1.7.2 and 1.6.17 released
by Aleksander Machniak 05 Jul '26

05 Jul '26

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. -- Alec

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Proposal: Send Later plugin for Roundcube
by Piotr Chyżyński 30 Jun '26

30 Jun '26

2 1

disable the new MouseOverMenue
by aschwab＠schwartech.de 17 Jun '26

17 Jun '26

Dear all, in the newest Version a MouseOverMenue was integrated. For my usual workflow it bothers me quite a bit so I was searching were to disable it but could not find the option. Neither in the "settings" menue nor in the "config.inc.php" Does anybody know where to disable this new MouseOverMenue? Best, Arne

3 6

date format question
by maintenance＠clearlytahoe.com 14 Jun '26

14 Jun '26

Hello, I'm a employee at Clearly Tahoe kayak rentals around Tahoe lake in California. I was wondering is there a way to format the date to reflect the local customs for presenting it (mm/dd/yy)? I did see that you can change the format for how it looks but not necessarily change the placement of day/month/year values. Please let me know is it possible to change the date format to month/day/year and where to do it since _settings>preferences>user interface_ deals only with the visual aspect not the actual formatting of the date. will appreciate any input and/or guidance how to address this. thank you, Radoslaw Jeziorski maintenance coordinator

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Security updates 1.7.1 and 1.6.16 released
by Aleksander Machniak 24 May '26

24 May '26

Here's the same message with corrected subject. Sorry about that. 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 stored XSS/HTML/CSS injection in subject field of the draft restore dialog, reported by zazy - Fix CSS injection bypass in HTML sanitizer via SVG `<animate attributeName="style">`, reported by wooseokdotkim - Fix pre-auth SQL injection in virtuser_query plugin via preg_replace backslash escape bypass, reported by skull - Fix SSRF bypass via specific local address URLs - Fix local/private URL fetch bypass when remote resources were not allowed, reported by Orange Cyberdefense Vulnerability Disclosure Team - Fix bypass of remote image blocking via CSS var(), reported by Geame - Fix pre-auth arbitrary file delete via redis/memcache session poisoning bypass, reported by valent1 - Fix code injection vulnerability - remove support for code evaluation in LDAP `autovalues` option, reported by Glendaenri See the full changelogs in the release notes on the Github download pages for the updated versions 1.7.1 and 1.6.16. https://github.com/roundcube/roundcubemail/releases/tag/1.7.1 https://github.com/roundcube/roundcubemail/releases/tag/1.6.16 We strongly recommend to update all productive installations of Roundcube 1.6.x and 1.7.x with this new versions. -- Alec

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