An issue was discovered in Roundcube Webmail 1.6.0 before 1.6.14. Insufficient Cascading Style Sheets (CSS) sanitization in HTML e-mail messages may lead to SSRF or Information Disclosure, e.g., if stylesheet links point to local network hosts.

The remote Debian 11 host has packages installed that are affected by multiple vulnerabilities as referenced in the dla-4604 advisory.

    -------------------------------------------------------------------------     Debian LTS Advisory DLA-4604-1                debian-lts@lists.debian.org     https://www.debian.org/lts/security/                       Guilhem Moulin     May 28, 2026                                  https://wiki.debian.org/LTS
    -------------------------------------------------------------------------

    Package        : roundcube     Version        : 1.4.15+dfsg.1-1+deb11u9     CVE ID         : CVE-2026-48842 CVE-2026-48843 CVE-2026-48844 CVE-2026-48845                      CVE-2026-48846 CVE-2026-48847 CVE-2026-48848 CVE-2026-48849     Debian Bug     : 1132838 1137507

    Multiple vulnerabilities were discovered in Roundcube, a skinnable AJAX     based webmail solution for IMAP servers, which could result in     cross-site scripting, SQL injection, server-side request forgery,     information disclosure, code injection, or deletion of arbitrary files.

    CVE-2026-48842

        Pre-authentication SQL injection in `virtuser_query` plugin via         `preg_replace()` backslash escape bypass.

    CVE-2026-48843

       Server-Side Request Forgery (SSRF) vulnerability via stylesheet links        to a specific local address URLs.  This issues stems from an        insufficient fix for CVE-2026-35540.

    CVE-2026-48844

        Code injection vulnerability via code evaluation support in LDAP's         `autovalues` option.  Code evaluation support has been removed in         this update.

    CVE-2026-48845

        Local/private URL fetch bypass when remote resources were not         allowed.  This allows attackers to bypass remote image blocking to         potentially bypass access control.

    CVE-2026-48846

        Bypass of remote image blocking via CSS `var()`.  This allows         attackers to bypass remote image blocking to track email open action         or potentially bypass access control.

    CVE-2026-48847

        Pre-authentication arbitrary file delete via redis/memcache session         poisoning bypass.

    CVE-2026-48848

        CSS injection bypass in HTML sanitizer via SVG `<animate         attributeName=style>`.

    CVE-2026-48849

        Stored XSS/HTML/CSS injection in subject field of the draft restore         dialog.

    For Debian 11 bullseye, these problems have been fixed in version     1.4.15+dfsg.1-1+deb11u9.

    We recommend that you upgrade your roundcube packages.

    For the detailed security status of roundcube please refer to     its security tracker page at:
    https://security-tracker.debian.org/tracker/roundcube

    Further information about Debian LTS security advisories, how to apply     these updates to your system and frequently asked questions can be     found at: https://wiki.debian.org/LTS     Attachment:
    signature.asc     Description: PGP signature

Tenable has extracted the preceding description block directly from the Debian security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote Fedora 44 host has a package installed that is affected by multiple vulnerabilities as referenced in the FEDORA-2026-6d293b6889 advisory.

    **Version 1.7-rc6**

    This is hopefully the last release candidate for the next major version 1.7 of Roundcube Webmail.
    It provides a fix to recently reported security vulnerability:

    -    SVG Animate FUNCIRI Attribute Bypass  Remote Image Loading via fill/filter/stroke, reported by     class_nzm.

    We believe it is production ready, but we recommend to test it on a separate environment.

    Migrate existing configs with either the installto.sh or the update.sh scripts.

    And don't forget to backup your data before installing it!

    CHANGELOG

    -    Added support for arrays in smtp_user and smtp_pass config options (#10083)
    -    Added system health checker CLI script (#10106)
    -    Stricter recognition of an Ajax request (#10118)
    -    Password: Added Stalwart driver (#10114)
    -    Fix regression where some data url images could get ignored/lost (#10128)
    -    Fix SVG Animate FUNCIRI Attribute Bypass  Remote Image Loading via fill/filter/stroke



Tenable has extracted the preceding description block directly from the Fedora security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote Fedora 42 host has a package installed that is affected by multiple vulnerabilities as referenced in the FEDORA-2026-051825ca18 advisory.

    **Version 1.6.15**

    This is a security update to the stable version 1.6 of Roundcube Webmail.
    It provides fixes to some regressions introduced in the previous release as well a recently reported     security vulnerability:

    -    SVG Animate FUNCIRI Attribute Bypass  Remote Image Loading via fill/filter/stroke, reported by     class_nzm.

    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

    -    Fix regression where mail search would fail on non-ascii search criteria (#10121)
    -    Fix regression where some data url images could get ignored/lost (#10128)
    -    Fix SVG Animate FUNCIRI Attribute Bypass  Remote Image Loading via fill/filter/stroke



Tenable has extracted the preceding description block directly from the Fedora security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote Fedora 43 host has a package installed that is affected by multiple vulnerabilities as referenced in the FEDORA-2026-8ba1a085a9 advisory.

    **Version 1.6.15**

    This is a security update to the stable version 1.6 of Roundcube Webmail.
    It provides fixes to some regressions introduced in the previous release as well a recently reported     security vulnerability:

    -    SVG Animate FUNCIRI Attribute Bypass  Remote Image Loading via fill/filter/stroke, reported by     class_nzm.

    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

    -    Fix regression where mail search would fail on non-ascii search criteria (#10121)
    -    Fix regression where some data url images could get ignored/lost (#10128)
    -    Fix SVG Animate FUNCIRI Attribute Bypass  Remote Image Loading via fill/filter/stroke



Tenable has extracted the preceding description block directly from the Fedora security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote Debian 13 host has packages installed that are affected by multiple vulnerabilities as referenced in the dsa-6196 advisory.

    - -------------------------------------------------------------------------     Debian Security Advisory DSA-6196-1                   security@debian.org     https://www.debian.org/security/                     Salvatore Bonaccorso     April 04, 2026                        https://www.debian.org/security/faq
    - -------------------------------------------------------------------------

    Package        : roundcube     CVE ID         : CVE-2026-35537 CVE-2026-35538 CVE-2026-35539 CVE-2026-35540                      CVE-2026-35541 CVE-2026-35542 CVE-2026-35543 CVE-2026-35544                      CVE-2026-35545     Debian Bug     : 1131182 1132268

    Multiple vulnerabilities were discovered in roundcube, a skinnable AJAX     based webmail solution for IMAP servers, which could result in     information disclosure, IMAP injection, CSRF bypass, bypass of remote     image blocking, cross-site scripting, access control bypass, or     privilege escalation.

    For the oldstable distribution (bookworm), these problems have been fixed     in version 1.6.5+dfsg-1+deb12u8.

    For the stable distribution (trixie), these problems have been fixed in     version 1.6.15+dfsg-0+deb13u1.

    We recommend that you upgrade your roundcube packages.

    For the detailed security status of roundcube please refer to its     security tracker page at:
    https://security-tracker.debian.org/tracker/roundcube

    Further information about Debian Security Advisories, how to apply     these updates to your system and frequently asked questions can be     found at: https://www.debian.org/security/

    Mailing list: debian-security-announce@lists.debian.org

Tenable has extracted the preceding description block directly from the Debian security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available.

  - An issue was discovered in Roundcube Webmail 1.6.0 before 1.6.14. Insufficient Cascading Style Sheets     (CSS) sanitization in HTML e-mail messages may lead to SSRF or Information Disclosure, e.g., if stylesheet     links point to local network hosts. (CVE-2026-35540)

Note that Nessus relies on the presence of the package as reported by the vendor.

There are packages installed that are affected by a vulnerability referenced in the following CVE:

  - An issue was discovered in Roundcube Webmail 1.6.0 before 1.6.14. Insufficient Cascading Style Sheets
    (CSS) sanitization in HTML e-mail messages may lead to SSRF or Information Disclosure, e.g., if stylesheet
    links point to local network hosts. (CVE-2026-35540)

ID	Name	Product	Family	Severity
317444	Debian dla-4604 : roundcube - security update	Nessus	Debian Local Security Checks	medium
310687	Fedora 44 : roundcubemail (2026-6d293b6889)	Nessus	Fedora Local Security Checks	high
305675	Fedora 42 : roundcubemail (2026-051825ca18)	Nessus	Fedora Local Security Checks	high
305671	Fedora 43 : roundcubemail (2026-8ba1a085a9)	Nessus	Fedora Local Security Checks	high
305020	Debian dsa-6196 : roundcube - security update	Nessus	Debian Local Security Checks	high
304879	Linux Distros Unpatched Vulnerability : CVE-2026-35540	Nessus	Misc.	medium
439860	SCA: security update for roundcube/roundcubemail (GHSA-vxg2-hhgr-37fx)	Tenable Cloud Security	SCA Checks	medium
439860	SCA: security update for roundcube/roundcubemail (GHSA-vxg2-hhgr-37fx)	Tenable Self-Hosted Container Security	SCA Checks	medium

Detections

Analytics

CVE-2026-35540

medium

Tenable Plugins

medium

high

high

high

high

medium

medium

medium