CVE-2026-26079

Roundcube Webmail before 1.5.13 and 1.6 before 1.6.13 allows Cascading Style Sheets (CSS) injection, e.g., because comments are mishandled.

Roundcube Webmail before 1.5.13 and 1.6 before 1.6.13 allows Cascading Style Sheets (CSS) injection, e.g., because comments are mishandled.

Roundcube Webmail before 1.5.13 and 1.6 before 1.6.13 allows Cascading Style Sheets (CSS) injection, e.g., because comments are mishandled.

Roundcube Webmail before 1.5.13 and 1.6 before 1.6.13 allows Cascading Style Sheets (CSS) injection, e.g., because comments are mishandled.

Roundcube Webmail before 1.5.13 and 1.6 before 1.6.13 allows Cascading Style Sheets (CSS) injection, e.g., because comments are mishandled.

Roundcube Webmail before 1.5.13 and 1.6 before 1.6.13 allows Cascading Style Sheets (CSS) injection, e.g., because comments are mishandled.

Roundcube Webmail before 1.5.13 and 1.6 before 1.6.13 allows Cascading Style Sheets (CSS) injection, e.g., because comments are mishandled.

Fix pre-auth arbitrary file write via unsafe deserialization in redis/memcache session handler, reported by y0us. Fix bug where a password could get changed without providing the old password, reported by flydragon777. Fix IMAP Injection + CSRF bypass in mail search, reported by Martila Security Research Team. Fix remote image blocking bypass via various SVG animate attributes, reported by nullcathedral. Fix remote image blocking bypass via a crafted body background attribute, reported by nullcathedral. Fix fixed position mitigation bypass via use of !important, reported by nullcathedral. Fix XSS issue in a HTML attachment preview, reported by aikido_security. Fix SSRF + Information Disclosure via stylesheet links to a local network hosts, reported by Georgios Tsimpidas (aka Frey), Security Researcher at https://i0.rs/.

This update for roundcubemail fixes the following issues:

Changes to roundcubemail:

Update to 1.6.13:

This is a security update to the stable version 1.6 of Roundcube Webmail. It provides fixes to recently reported security vulnerabilities:

• Fix CSS injection vulnerability reported by CERT Polska (boo#1258052, CVE-2026-26079).
• Fix remote image blocking bypass via SVG content reported by nullcathedral (boo#1257909, CVE-2026-25916).

This version is considered stable and we recommend to update all productive installations of Roundcube 1.6.x with it. Please do backup your data before updating!

CHANGELOG

• Managesieve: Fix handling of string-list format values for date tests in Out of Office (#10075)
• Fix CSS injection vulnerability reported by CERT Polska.
• Fix remote image blocking bypass via SVG content reported by nullcathedral.

Update to 1.6.12:

This is a security update to the stable version 1.6 of Roundcube Webmail. It provides fixes to recently reported security vulnerabilities:

• Fix Cross-Site-Scripting vulnerability via SVG's animate tag reported by Valentin T., CrowdStrike (boo#1255308, CVE-2025-68461).
• Fix Information Disclosure vulnerability in the HTML style sanitizer reported by somerandomdev (boo#1255306, CVE-2025-68460).

This version is considered stable and we recommend to update all productive installations of Roundcube 1.6.x with it.

• Support IPv6 in database DSN (#9937)
• Don't force specific error_reporting setting
• Fix compatibility with PHP 8.5 regarding array_first()
• Remove X-XSS-Protection example from .htaccess file (#9875)
• Fix "Assign to group" action state after creation of a first group (#9889)
• Fix bug where contacts search would fail if contactlist_fields contained vcard fields (#9850)
• Fix bug where an mbox export file could include inconsistent message delimiters (#9879)
• Fix parsing of inline styles that aren't well-formatted (#9948)
• Fix Cross-Site-Scripting vulnerability via SVG's animate tag
• Fix Information Disclosure vulnerability in the HTML style sanitizer

Update to 1.6.11

This is a security update to the stable version 1.6 of Roundcube Webmail. It provides fixes to recently reported security vulnerabilities:

• Fix Post-Auth RCE via PHP Object Deserialization reported by firs0v.

• CHANGELOG
  • Managesieve: Fix match-type selector (remove unsupported options) in delete header action (#9610)
  • Improve installer to fix confusion about disabling SMTP authentication (#9801)
  • Fix PHP warning in index.php (#9813)
  • OAuth: Fix/improve token refresh
  • Fix dark mode bug where wrong colors were used for blockquotes in HTML mail preview (#9820)
  • Fix HTML message preview if it contains floating tables (#9804)
  • Fix removing/expiring redis/memcache records when using a key prefix
  • Fix bug where a wrong SPECIAL-USE folder could have been detected, if there were more than one per-type (#9781)
  • Fix a default value and documentation of password_ldap_encodage option (#9658)
  • Remove mobile/floating Create button from the list in Settings > Folders (#9661)
  • Fix Delete and Empty buttons state while creating a folder (#9047)
  • Fix connecting to LDAP using ldapi:// URI (#8990)
  • Fix cursor position on "below the quote" reply in HTML mode (#8700)
  • Fix bug where attachments with content type of application/vnd.ms-tnef were not parsed (#7119)

Update to 1.6.10:

This is the next service release to update the stable version 1.6.

• IMAP: Partial support for ANNOTATE-EXPERIMENT-1 extension (RFC 5257)
• OAuth: Support standard authentication with short-living password received with OIDC token (#9530)
• Fix PHP warnings (#9616, #9611)
• Fix whitespace handling in vCard line continuation (#9637)
• Fix current script state after initial scripts creation in managesieve_kolab_master mode
• Fix rcube_imap::get_vendor() result (and PHP warning) on Zimbra server (#9650) …