Linux Distros Unpatched Vulnerability : CVE-2026-61910

#%NASL_MIN_LEVEL 80900
##
# (C) Tenable, Inc.
##

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  script_id(344531);
  script_version("1.4");
  script_set_attribute(attribute:"plugin_modification_date", value:"2026/09/11");

  script_cve_id("CVE-2026-61910");

  script_name(english:"Linux Distros Unpatched Vulnerability : CVE-2026-61910");

  script_set_attribute(attribute:"synopsis", value:
"The Linux/Unix host has one or more packages installed with a vulnerability that the vendor indicates will not be
patched.");
  script_set_attribute(attribute:"description", value:
"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 Cyrus IMAP before 3.12.4. Mailbox/set let a sharee change a special-use role on
    shared mailboxes. An authenticated user with maySetKeywords on another user's mailbox could change that
    mailbox's specialuse annotation. This could allow the sharee to change the shared mailbox to perform the
    archived, snoozed, or other role, which might cause mail mail to be written to the shared mailbox, sharing
    more content than intended. (This is likely to be an unusual situation, made more unusual because if the
    target already has an non-shared mailbox with that role, role duplication suppression will prevent the
    update.) (CVE-2026-61910)

Note that Nessus relies on the presence of the package as reported by the vendor.");
  script_set_attribute(attribute:"see_also", value:"https://access.redhat.com/security/cve/cve-2026-61910");
  script_set_attribute(attribute:"see_also", value:"https://security-tracker.debian.org/tracker/CVE-2026-61910");
  script_set_attribute(attribute:"see_also", value:"https://ubuntu.com/security/CVE-2026-61910");
  script_set_attribute(attribute:"solution", value:
"There is no known solution at this time.");
  script_set_attribute(attribute:"agent", value:"unix");
  script_set_cvss_base_vector("CVSS2#AV:L/AC:L/Au:S/C:N/I:P/A:N");
  script_set_cvss_temporal_vector("CVSS2#E:U/RL:U/RC:C");
  script_set_cvss3_base_vector("CVSS:3.0/AV:N/AC:H/PR:L/UI:N/S:C/C:L/I:N/A:N");
  script_set_cvss3_temporal_vector("CVSS:3.0/E:U/RL:U/RC:C");
  script_set_attribute(attribute:"cvss_score_source", value:"CVE-2026-61910");

  script_set_attribute(attribute:"exploitability_ease", value:"No known exploits are available");
  script_set_attribute(attribute:"exploit_available", value:"false");
  script_set_attribute(attribute:"vendor_unpatched", value:"true");

  script_set_attribute(attribute:"vuln_publication_date", value:"2026/09/09");
  script_set_attribute(attribute:"plugin_publication_date", value:"2026/09/10");

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  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:cyrus-imapd");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:cyrus-imapd-devel");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:cyrus-imapd-libs");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:cyrus-imapd-utils");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:cyrus-imapd-vzic");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:perl-Cyrus");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:cyrus-imapd");
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  script_copyright(english:"This script is Copyright (C) 2026 and is owned by Tenable, Inc. or an Affiliate thereof.");

  script_dependencies("ssh_get_info2.nasl", "set_linux_os_id.nasl");
  script_require_keys("Host/cpu", "Host/local_checks_enabled", "global_settings/vendor_unpatched", "Host/OS/identifier");
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  exit(0);
}

if (!get_kb_item("global_settings/vendor_unpatched")) exit(0, "Unpatched Vulnerabilities Detection not active.");
if (!get_kb_item("Host/local_checks_enabled")) audit(AUDIT_LOCAL_CHECKS_NOT_ENABLED);
if (empty_or_null(get_one_kb_item("Host/CentOS/rpm-list")) && empty_or_null(get_one_kb_item("Host/Debian/dpkg-l")) && empty_or_null(get_one_kb_item("Host/RedHat/rpm-list"))) audit(AUDIT_PACKAGE_LIST_MISSING);

include('linux_unpatched.inc');

var distro_constraints_array = {
  "Debian Linux-12": {
    "package_manager": "dpkg-l",
    "constraints": [
      {
        "release": "12",
        "pkgs": [
          {"reference": "cyrus-admin"},
          {"reference": "cyrus-caldav"},
          {"reference": "cyrus-clients"},
          {"reference": "cyrus-common"},
          {"reference": "cyrus-dev"},
          {"reference": "cyrus-doc"},
          {"reference": "cyrus-imapd"},
          {"reference": "cyrus-murder"},
          {"reference": "cyrus-nntpd"},
          {"reference": "cyrus-pop3d"},
          {"reference": "cyrus-replication"},
          {"reference": "libcyrus-imap-perl"}
        ]
      }
    ]
  },
  "Debian Linux-13": {
    "package_manager": "dpkg-l",
    "constraints": [
      {
        "release": "13",
        "pkgs": [
          {"reference": "cyrus-admin"},
          {"reference": "cyrus-caldav"},
          {"reference": "cyrus-clients"},
          {"reference": "cyrus-common"},
          {"reference": "cyrus-dev"},
          {"reference": "cyrus-doc"},
          {"reference": "cyrus-imapd"},
          {"reference": "cyrus-murder"},
          {"reference": "cyrus-nntpd"},
          {"reference": "cyrus-pop3d"},
          {"reference": "cyrus-replication"},
          {"reference": "libcyrus-imap-perl"}
        ]
      }
    ]
  },
  "Debian Linux-14": {
    "package_manager": "dpkg-l",
    "constraints": [
      {
        "release": "14",
        "pkgs": [
          {"reference": "cyrus-admin"},
          {"reference": "cyrus-caldav"},
          {"reference": "cyrus-clients"},
          {"reference": "cyrus-common"},
          {"reference": "cyrus-dev"},
          {"reference": "cyrus-doc"},
          {"reference": "cyrus-imapd"},
          {"reference": "cyrus-murder"},
          {"reference": "cyrus-nntpd"},
          {"reference": "cyrus-pop3d"},
          {"reference": "cyrus-replication"},
          {"reference": "libcyrus-imap-perl"}
        ]
      }
    ]
  },
  "Ubuntu Linux-18.04": {
    "package_manager": "dpkg-l",
    "constraints": [
      {
        "release": "18.04",
        "pkgs": [
          {"reference": "cyrus-imapd"}
        ]
      }
    ]
  },
  "Ubuntu Linux-20.04": {
    "package_manager": "dpkg-l",
    "constraints": [
      {
        "release": "20.04",
        "pkgs": [
          {"reference": "cyrus-imapd"}
        ]
      }
    ]
  },
  "Ubuntu Linux-22.04": {
    "package_manager": "dpkg-l",
    "constraints": [
      {
        "release": "22.04",
        "pkgs": [
          {"reference": "cyrus-imapd"}
        ]
      }
    ]
  },
  "Ubuntu Linux-24.04": {
    "package_manager": "dpkg-l",
    "constraints": [
      {
        "release": "24.04",
        "pkgs": [
          {"reference": "cyrus-imapd"}
        ]
      }
    ]
  },
  "Ubuntu Linux-26.04": {
    "package_manager": "dpkg-l",
    "constraints": [
      {
        "release": "26.04",
        "pkgs": [
          {"reference": "cyrus-imapd"}
        ]
      }
    ]
  },
  "Red Hat Enterprise Linux-10": {
    "package_manager": "rpm-list",
    "constraints": [
      {
        "release": "10",
        "pkgs": [
          {"reference": "cyrus-imapd"},
          {"reference": "cyrus-imapd-libs"},
          {"reference": "cyrus-imapd-utils"},
          {"reference": "perl-Cyrus"}
        ]
      }
    ]
  },
  "Red Hat Enterprise Linux-9": {
    "package_manager": "rpm-list",
    "constraints": [
      {
        "release": "9",
        "pkgs": [
          {"reference": "cyrus-imapd"},
          {"reference": "cyrus-imapd-libs"},
          {"reference": "cyrus-imapd-utils"},
          {"reference": "perl-Cyrus"}
        ]
      }
    ]
  },
  "CentOS Linux-7": {
    "package_manager": "rpm-list",
    "constraints": [
      {
        "release": "7",
        "pkgs": [
          {"reference": "cyrus-imapd"},
          {"reference": "cyrus-imapd-devel"},
          {"reference": "cyrus-imapd-utils"}
        ]
      }
    ]
  },
  "Red Hat Enterprise Linux-7": {
    "package_manager": "rpm-list",
    "constraints": [
      {
        "release": "7",
        "pkgs": [
          {"reference": "cyrus-imapd"},
          {"reference": "cyrus-imapd-devel"},
          {"reference": "cyrus-imapd-utils"}
        ]
      }
    ]
  },
  "CentOS Linux-8": {
    "package_manager": "rpm-list",
    "constraints": [
      {
        "release": "8",
        "pkgs": [
          {"reference": "cyrus-imapd"},
          {"reference": "cyrus-imapd-utils"},
          {"reference": "cyrus-imapd-vzic"}
        ]
      }
    ]
  },
  "Red Hat Enterprise Linux-8": {
    "package_manager": "rpm-list",
    "constraints": [
      {
        "release": "8",
        "pkgs": [
          {"reference": "cyrus-imapd"},
          {"reference": "cyrus-imapd-utils"},
          {"reference": "cyrus-imapd-vzic"}
        ]
      }
    ]
  }
};

var distro_constraints_values = linux_unpatched::get_distro_constraints(distro_constraints_arr:distro_constraints_array);
if (empty_or_null(distro_constraints_values)) audit(AUDIT_HOST_NOT, 'affected');

var third_party_support = get_kb_item('Host/OS/extended-third-party');
if (!empty_or_null(third_party_support)) {
    var third_party_vendors = distro_constraints_values['third_party'];
    if (!empty_or_null(third_party_vendors)) {
        var vendor;
        foreach vendor (third_party_vendors) {
            if (vendor == third_party_support) exit(0, 'A third party management patch is available for this vulnerability from ' + vendor + '.\n');
        }
    }
}

var report = linux_unpatched::check_unpatched_constraints(distro_constraints_values:distro_constraints_values);

if (!empty_or_null(report))
{
  security_report_v4(
      port       : 0,
      severity   : SECURITY_NOTE,
      extra      : report
  );
  exit(0);
}
else
{
  audit(AUDIT_HOST_NOT, 'affected');
}