Roundcube Webmail 1.6.x between 1.6.14 and 1.6.16,and 1.7.x before 1.7.1 has 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 issue stems from an insufficient fix for CVE-2026-35540.

The remote Debian 11 / 12 host has packages installed that are affected by multiple vulnerabilities as referenced in the dla-4693 advisory.

    -------------------------------------------------------------------------     Debian LTS Advisory DLA-4693-1                debian-lts@lists.debian.org     https://www.debian.org/lts/security/                       Guilhem Moulin     July 22, 2026                                 https://wiki.debian.org/LTS
    -------------------------------------------------------------------------

    Package        : roundcube     Version        : 1.4.15+dfsg.1-1+deb11u10 1.6.5+dfsg-1+deb12u10     CVE ID         : CVE-2026-54432 CVE-2026-54433 CVE-2026-62641 CVE-2026-62642                      CVE-2026-62643 CVE-2026-62644     Debian Bug     : 1138086 1141495

    Multiple vulnerabilities were discovered in Roundcube, a skinnable AJAX     based webmail solution for IMAP servers, which could result in     cross-site scripting, server-side request forgery, information     disclosure, denial of service, or potentially account takeover.

    CVE-2026-54432

        Bohdan Kurinnoy discovered that attachment MIME types were neither         sanitized nor escaped on the attachment-validation warning page,         yielding a stored XSS vulnerability.

    CVE-2026-54433

        Bohdan Kurinnoy discovered that plain-text rendering was subject to         a zero-click stored XSS vulnerability via crafted mailto: URIs.

    CVE-2026-62641

        It was discovered that the TNEF decoder was subject to Denial of         Service via crafted compressed-RTF size in the winmail.dat         attachment file.

    CVE-2026-62642

        An infinite loop was discovered in the TNEF decoder, which may lead         to denial of service upon opening an email with a TNEF attachment.

    CVE-2026-62643

        It was discovered that the CSS sanitization fixes for CVE-2026-35540 and         CVE-2026-48843 were insufficient, allowing a malicious embedded         stylesheet in an HTML email to lead to SSRF or information         disclosure.

    CVE-2026-62644

        It was discovered that the password plugin was subject to username         spoofing via session data, which could potentially lead to account         takeover.

    For Debian 11 bullseye, these problems have been fixed in version     1.4.15+dfsg.1-1+deb11u10.

    For Debian 12 bookworm, these problems have been fixed in version     1.6.5+dfsg-1+deb12u10.

    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 43 host has a package installed that is affected by multiple vulnerabilities as referenced in the FEDORA-2026-07ee097ffe advisory.

    ## Release 1.6.16

    - Fix potential too long value in IMAP ID command (#10136)
    - Security: Fix stored XSS/HTML/CSS injection in subject field of the draft restore dialog
    - Security: Fix CSS injection bypass in HTML sanitizer via SVG `<animate attributeName=style>`
    - Security: Fix pre-auth SQL injection in `virtuser_query` plugin via preg_replace backslash escape bypass
    - Security: Fix SSRF bypass via specific local address URLs
    - Security: Fix bypass of remote image blocking via CSS var()
    - Security: Fix local/private URL fetch bypass when remote resources were not allowed
    - Security: Fix pre-auth arbitrary file delete via redis/memcache session poisoning bypass
    - Security: Fix code injection vulnerability - remove support for code evaluation in LDAP `autovalues`     option




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 44 host has a package installed that is affected by multiple vulnerabilities as referenced in the FEDORA-2026-2b956d89d3 advisory.

    ## Release 1.7.1

    - Enigma: Support automatic public key lookup (import) using HKP v1 protocol (#5314)
    - Managesieve: Fix error when a mail message contains duplicate List-Id header (#10186)
    - Clarified Elastic installation instructions (#10163)
    - Added HTMLFormElement.requestSubmit() polyfill for older browsers (#10179)
    - Fix so has:attachment search uses $HasAttachment/$HasNoAttachment keywords (#10168)
    - Fix potential too long value in IMAP ID command (#10136)
    - Fix redis/memcache disconnection in rcube::sleep() (#10127)
    - Fix so static resources, e.g. skin_logo can be put inside the public_html directory (#10160)
    - Fix so `REQUEST_URI` is used as a fallback if `PATH_INFO` is not set in static.php (#10181)
    - Fix `assets_path` feature and remove dependency on `PATH_INFO` (#10185)
    - Fix MySQL upgrade on MySQL < 8.0 and MariaDB < 10.5.3 (#10188)
    - Security: Fix stored XSS/HTML/CSS injection in subject field of the draft restore dialog
    - Security: Fix CSS injection bypass in HTML sanitizer via SVG `<animate attributeName=style>`
    - Security: Fix pre-auth SQL injection in `virtuser_query` plugin via preg_replace backslash escape bypass
    - Security: Fix SSRF bypass via specific local address URLs
    - Security: Fix bypass of remote image blocking via CSS var()
    - Security: Fix local/private URL fetch bypass when remote resources were not allowed
    - Security: Fix pre-auth arbitrary file delete via redis/memcache session poisoning bypass
    - Security: Fix code injection vulnerability - remove support for code evaluation in LDAP `autovalues`     option




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 openSUSE 16 host has a package installed that is affected by multiple vulnerabilities as referenced in the openSUSE-SU-2026:20852-1 advisory.

    Changes in roundcubemail:

    - update to 1.6.16
      - Fix potential too long value in IMAP ID command (#10136)
      - Security: Fix stored XSS/HTML/CSS injection in subject field of the draft restore dialog     [CVE-2026-48849] [bsc#1266337]
      - Security: Fix CSS injection bypass in HTML sanitizer via SVG 'animate attributeName=style'     [CVE-2026-48848] [bsc#1266336]
      - Security: Fix pre-auth SQL injection in virtuser_query plugin via preg_replace backslash escape bypass     [CVE-2026-48842] [bsc#1266329]
      - Security: Fix SSRF bypass via specific local address URLs [CVE-2026-48843] [bsc#1266331]
      - Security: Fix bypass of remote image blocking via CSS var() [CVE-2026-48846] [bsc#1266334]
      - Security: Fix local/private URL fetch bypass when remote resources were not allowed [CVE-2026-48845]     [bsc#1266333]
      - Security: Fix pre-auth arbitrary file delete via redis/memcache session poisoning bypass     [CVE-2026-48847] [bsc#1266335]
      - Security: Fix code injection vulnerability - remove support for code evaluation in LDAP autovalues     option [CVE-2026-48844] [bsc#1266332]

Tenable has extracted the preceding description block directly from the SUSE 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 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 Debian 12 / 13 host has packages installed that are affected by multiple vulnerabilities as referenced in the dsa-6301 advisory.

    - -------------------------------------------------------------------------     Debian Security Advisory DSA-6301-1                   security@debian.org     https://www.debian.org/security/                       Moritz Muehlenhoff     May 27, 2026                          https://www.debian.org/security/faq
    - -------------------------------------------------------------------------

    Package        : roundcube     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

    Multiple security vulnerabilities were discovered in RoundCube Webmail,     which could result in cross-site scripting, SQL injection, SSRF bypass,     information disclosure, denial of service or code injection.

    For the oldstable distribution (bookworm), these problems have been fixed     in version 1.6.5+dfsg-1+deb12u9.

    For the stable distribution (trixie), these problems have been fixed in     version 1.6.16+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.

  - Roundcube Webmail 1.6.x between 1.6.14 and 1.6.16,and 1.7.x before 1.7.1 has 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 issue stems from an insufficient fix for     CVE-2026-35540. (CVE-2026-48843)

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

ID	Name	Product	Family	Type	Severity
328879	Debian dla-4693 : roundcube - security update	Nessus	Debian Local Security Checks	Local	critical
318601	Fedora 43 : roundcubemail (2026-07ee097ffe)	Nessus	Fedora Local Security Checks	Local	high
318362	Fedora 44 : roundcubemail (2026-2b956d89d3)	Nessus	Fedora Local Security Checks	Local	high
318192	openSUSE 16 Security Update : roundcubemail (openSUSE-SU-2026:20852-1)	Nessus	SuSE Local Security Checks	Local	high
317444	Debian dla-4604 : roundcube - security update	Nessus	Debian Local Security Checks	Local	medium
317344	Debian dsa-6301 : roundcube - security update	Nessus	Debian Local Security Checks	Local	high
316869	Linux Distros Unpatched Vulnerability : CVE-2026-48843	Nessus	Misc.	Local	high

Detections

Analytics

CVE-2026-48843

high

Tenable Plugins

critical

high

high

high

medium

high

high