Debian dla-4823 : roundcube - security update

critical Nessus Plugin ID 363011

Synopsis

The remote Debian host is missing one or more security-related updates.

Description

The remote Debian 12 host has packages installed that are affected by multiple vulnerabilities as referenced in the dla-4823 advisory.

------------------------------------------------------------------------- Debian LTS Advisory DLA-4823-1 [email protected] https://www.debian.org/lts/security/ Guilhem Moulin October 05, 2026 https://wiki.debian.org/LTS
-------------------------------------------------------------------------

Package : roundcube Version : 1.6.5+dfsg-1+deb12u12 CVE ID : not yet available Debian Bug : 1146838

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, email header injection, or privilege escalation.

Zach Hanley discovered that the CSS sanitizer was prone to declaration smuggling via un-encoded ampersand emission, which may lead to remote image blocking bypass or XSS.

The CSS sanitizer is prone to property injection via body `background` attribute, which may lead to remote image blocking bypass or XSS.

The sendmail logic is prone to email header injection via bare CR in the subject field, C-escape `\r` in the recipient display name, and/or identity's organization field.

The attachment URL is prone to TNEF MIME tag injection, which may lead to zero-click stored XSS.

Joshua Rogers discovered that the text/enriched part content in HTML editor was prone to XSS.

Joshua Rogers discovered that the contact group membership actions add/remove were prone to cross-user access.

The CSS sanitization fixes for CVE-2026-35540, CVE-2026-48843, CVE-2026-62643 and CVE-2026-75006 were insufficient, allowing a malicious embedded stylesheet in a text/html email to lead to SSRF or information disclosure.

Wahab Khadir discovered that insufficient HTML/CSS sanitization may lead to remote image blocking bypass or XSS via CSS escapes in FuncIRI attributes.

Insufficient HTML/CSS sanitization may lead to remote image blocking bypass or XSS via SVG SMIL src animation.

For Debian 12 bookworm, this problem has been fixed in version 1.6.5+dfsg-1+deb12u12.

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.

Solution

Upgrade the roundcube packages.

Plugin Details

Severity: Critical

ID: 363011

File Name: debian_DLA-4823.nasl

Version: 1.1

Type: Local

Agent: unix

Family: Debian Local Security Checks

Published: 10/5/2026

Updated: 10/5/2026

Supported Sensors: Agentless Assessment, Continuous Assessment, Frictionless Assessment Agent, Nessus Agent, Tenable Cloud Security, Tenable Self-Hosted Container Security, Nessus

Risk Information

VPR

Risk Factor: Medium

Score: 4.8

Percentile: 57.81

CVSS v2

Risk Factor: High

Base Score: 9.4

Temporal Score: 7

Vector: CVSS2#AV:N/AC:L/Au:N/C:C/I:C/A:N

CVSS Score Source: CVE-2026-62643

CVSS v3

Risk Factor: Critical

Base Score: 10

Temporal Score: 8.7

Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:N

Temporal Vector: CVSS:3.0/E:U/RL:O/RC:C

Vulnerability Information

CPE: cpe:/o:debian:debian_linux:12.0, p-cpe:/a:debian:debian_linux:roundcube-core, p-cpe:/a:debian:debian_linux:roundcube-mysql, p-cpe:/a:debian:debian_linux:roundcube-pgsql, p-cpe:/a:debian:debian_linux:roundcube-plugins, p-cpe:/a:debian:debian_linux:roundcube-sqlite3, p-cpe:/a:debian:debian_linux:roundcube

Required KB Items: Host/local_checks_enabled, Host/Debian/release, Host/Debian/dpkg-l

Exploit Ease: No known exploits are available

Patch Publication Date: 10/5/2026

Vulnerability Publication Date: 3/31/2026

Reference Information

CVE: CVE-2026-35540, CVE-2026-48843, CVE-2026-62643, CVE-2026-75006

IAVA: 2026-A-0301-S, 2026-A-0521, 2026-A-0663-S, 2026-A-0917

Detections

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