Atlassian Confluence < 9.2.26 / 10.2.x < 10.2.19 (CONFSERVER-104488)

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

include('compat.inc');

if (description)
{
  script_id(363027);
  script_version("1.1");
  script_set_attribute(attribute:"plugin_modification_date", value:"2026/10/05");

  script_cve_id("CVE-2026-21589");

  script_name(english:"Atlassian Confluence < 9.2.26 / 10.2.x < 10.2.19 (CONFSERVER-104488)");

  script_set_attribute(attribute:"synopsis", value:
"The remote Atlassian Confluence host is missing a security update.");
  script_set_attribute(attribute:"description", value:
"The version of Atlassian Confluence Server running on the remote host is affected by a vulnerability as referenced in
the CONFSERVER-104488 advisory.

  - h3. Summary This is a vulnerability in Bitbucket Data Center, Confluence Data Center, Jira Service
    Management Data Center, Jira Software Data Center, Bamboo Data Center. Crowd Data Center, Crucible and
    Fisheye. This Arbitrary File Access vulnerability allows an unauthenticated attacker to access specific
    files within the web application root directory in affected versions. Exploitation requires prior
    knowledge of the target file's exact name and path; this vulnerability does not allow attackers to
    enumerate or list directory contents. In some configurations, there may be some sensitive files that make
    this highly severe. h3. Context This vulnerability allows an unauthenticated remote attacker to access
    specific files within the web application root directory in affected versions. h3. Details: * The
    vulnerability must be addressed for affected versions of: Bitbucket Data Center, introduced in version >=
    4.6.0, fix versions: 9.4.26, 10.2.8, 10.5.1 Confluence Data Center, introduced in version >= 5.10.0, fix
    versions 9.2.26, 10.2.19 Crowd Data Center, introduced in version >= 2.11.0, fix versions 6.3.7, 7.0.3,
    7.1.1, 7.2.4 Jira Software Data Center, introduced in version >= 7.1.0, fix versions 9.12.40, 10.3.26,
    11.3.12 Jira Service Management Data Center, introduced in version >= 3.1.0, fix versions 5.12.40,
    10.3.26, 11.3.12 Bamboo Data Center >= 7.0.1, fix versions 10.2.24, 12.1.12 Crucible, fix versions 4.9.15
    Fisheye, fix version 4.9.15 * Exploitation requires prior knowledge of the target file's exact name and
    path. * The vulnerability does not include the capability to enumerate or list directory contents.
    (CVE-2026-21589)

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version
number.");
  script_set_attribute(attribute:"see_also", value:"https://jira.atlassian.com/browse/CONFSERVER-104488");
  script_set_attribute(attribute:"solution", value:
"Upgrade to Atlassian Confluence version 9.2.26, 10.2.19 or later.");
  script_set_attribute(attribute:"agent", value:"all");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:N/C:P/I:N/A:N");
  script_set_cvss_temporal_vector("CVSS2#E:U/RL:OF/RC:C");
  script_set_cvss3_base_vector("CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N");
  script_set_cvss3_temporal_vector("CVSS:3.0/E:U/RL:O/RC:C");
  script_set_attribute(attribute:"cvss4_vector", value:"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:H/SI:H/SA:H");
  script_set_attribute(attribute:"cvss4_threat_vector", value:"CVSS:4.0/E:U");
  script_set_attribute(attribute:"cvss_score_source", value:"CVE-2026-21589");

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

  script_set_attribute(attribute:"vuln_publication_date", value:"2026/10/05");
  script_set_attribute(attribute:"patch_publication_date", value:"2026/10/02");
  script_set_attribute(attribute:"plugin_publication_date", value:"2026/10/05");

  script_set_attribute(attribute:"plugin_type", value:"combined");
  script_set_attribute(attribute:"cpe", value:"cpe:/a:atlassian:confluence");
  script_set_attribute(attribute:"generated_plugin", value:"current");
  script_set_attribute(attribute:"thorough_tests", value:"true");
  script_set_attribute(attribute:"enable_cgi_scanning", value:"true");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_family(english:"CGI abuses");

  script_copyright(english:"This script is Copyright (C) 2026 and is owned by Tenable, Inc. or an Affiliate thereof.");

  script_dependencies("confluence_detect.nasl", "confluence_nix_installed.nbin", "confluence_win_installed.nbin");
  script_require_keys("installed_sw/Atlassian Confluence");

  exit(0);
}

include('vdf.inc');

# @tvdl-content-verify-only
var vuln_data = {
  "metadata": {
    "spec_version": "1.0"
  },
  "checks": [
    {
      "product": {
        "name": "Atlassian Confluence",
        "type": "app"
      },
      "check_algorithm": "default",
      "constraints": [
        {
          "fixed_version": "9.2.26",
          "fixed_display": "9.2.26 / 10.2.19"
        },
        {
          "min_version": "10.2.18",
          "fixed_version": "10.2.19"
        }
      ]
    }
  ]
};

var vdf_result = vdf::check_and_report(vuln_data:vuln_data, severity:SECURITY_WARNING);
vdf::handle_check_and_report_errors(vdf_result:vdf_result);