JetBrains YouTrack < 2026.2.17012 CSS Injection (CVE-2026-59791)

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

include('compat.inc');

if (description)
{
  script_id(327414);
  script_version("1.3");
  script_set_attribute(attribute:"plugin_modification_date", value:"2026/07/17");

  script_cve_id("CVE-2026-59791");
  script_xref(name:"IAVA", value:"2026-A-0682");

  script_name(english:"JetBrains YouTrack < 2026.2.17012 CSS Injection (CVE-2026-59791)");

  script_set_attribute(attribute:"synopsis", value:
"The remote host is affected by a CSS injection vulnerability.");
  script_set_attribute(attribute:"description", value:
"The version of JetBrains YouTrack installed on the remote host is prior to 2026.2.17012. It is, therefore, affected
by a CSS injection vulnerability:

  - CSS injection via Mermaid diagram rendering was possible. (CVE-2026-59791)

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://www.jetbrains.com/privacy-security/issues-fixed/");
  script_set_attribute(attribute:"solution", value:
"Upgrade to JetBrains YouTrack version 2026.2.17012, or later.");
  script_set_attribute(attribute:"agent", value:"all");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:S/C:N/I:P/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:L/UI:R/S:U/C:N/I:L/A:N");
  script_set_cvss3_temporal_vector("CVSS:3.0/E:U/RL:O/RC:C");
  script_set_attribute(attribute:"cvss_score_source", value:"CVE-2026-59791");

  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:"2026/07/10");
  script_set_attribute(attribute:"patch_publication_date", value:"2026/07/10");
  script_set_attribute(attribute:"plugin_publication_date", value:"2026/07/16");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"cpe:/a:jetbrains:youtrack");
  script_set_attribute(attribute:"thorough_tests", value:"true");
  script_set_attribute(attribute:"stig_severity", value:"I");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_family(english:"Misc.");

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

  script_dependencies("jetbrains_youtrack_win_installed.nbin", "jetbrains_youtrack_nix_installed.nbin");
  script_require_keys("installed_sw/JetBrains YouTrack");

  exit(0);
}

include('vdf.inc');

# @tvdl-content
var vuln_data = {
  'metadata': {'spec_version': '1.0'},
  'checks': [
    {
      'product': {'name': 'JetBrains YouTrack', 'type': 'app'},
      'check_algorithm': 'default',
      'constraints': [
        {'fixed_version': '2026.2.17012'}
      ]
    }
  ]
};

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