GitLab 18.9 < 19.1.7 / 19.2 < 19.2.5 / 19.3 < 19.3.1 (CVE-2026-18252)

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

include('compat.inc');

if (description)
{
  script_id(340157);
  script_version("1.2");
  script_set_attribute(attribute:"plugin_modification_date", value:"2026/08/28");

  script_cve_id("CVE-2026-18252");
  script_xref(name:"IAVA", value:"2026-A-0913");

  script_name(english:"GitLab 18.9 < 19.1.7 / 19.2 < 19.2.5 / 19.3 < 19.3.1 (CVE-2026-18252)");

  script_set_attribute(attribute:"synopsis", value:
"The version of GitLab installed on the remote host is affected by a vulnerability.");
  script_set_attribute(attribute:"description", value:
"The version of GitLab installed on the remote host is affected by a vulnerability, as follows:

  - GitLab has remediated an issue in GitLab EE affecting all versions from 18.9 before 19.1.7, 19.2 before
    19.2.5, and 19.3 before 19.3.1 that, under certain conditions, an authenticated user with developer-role
    permissions could have executed arbitrary commands in a CI context, due to the Claude agent processing
    configuration from a user-controlled source. (CVE-2026-18252)

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version
number.");
  # https://gitlab.com/gitlab-org/cves/-/blob/master/2026/CVE-2026-18252.json
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?39e254f2");
  script_set_attribute(attribute:"see_also", value:"https://gitlab.com/gitlab-org/gitlab/-/work_items/607342");
  script_set_attribute(attribute:"see_also", value:"https://hackerone.com/reports/3863650");
  # https://docs.gitlab.com/releases/patches/patch-release-gitlab-19-3-1-released/
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?ade817ae");
  script_set_attribute(attribute:"solution", value:
"Upgrade to GitLab version 19.1.7, 19.2.5, 19.3.1 or later.");
  script_set_attribute(attribute:"agent", value:"unix");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:S/C:C/I:C/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:H/I:H/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-2026-18252");

  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:"2026/08/26");
  script_set_attribute(attribute:"patch_publication_date", value:"2026/08/26");
  script_set_attribute(attribute:"plugin_publication_date", value:"2026/08/26");

  script_set_attribute(attribute:"plugin_type", value:"combined");
  script_set_attribute(attribute:"cpe", value:"cpe:/a:gitlab:gitlab");
  script_set_attribute(attribute:"generated_plugin", value:"current");
  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:"CGI abuses");

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

  script_dependencies("gitlab_webui_detect.nbin", "gitlab_nix_installed.nbin");
  script_require_keys("installed_sw/GitLab");

  exit(0);
}

include('vcf.inc');

var app = 'GitLab';
var app_info = vcf::combined_get_app_info(app:app);

if (report_paranoia < 2 && max_index(app_info.parsed_version[0]) < 3 && app_info.version =~ "^19\.(1|2|3)$")
  if (!empty_or_null(app_info.port))
    audit(AUDIT_POTENTIAL_VULN, app, app_info.version, app_info.port);
  else
    audit(AUDIT_POTENTIAL_VULN, app, app_info.version);

var constraints = [
  { 'min_version' : '18.9', 'fixed_version' : '19.1.7' },
  { 'min_version' : '19.2', 'fixed_version' : '19.2.5' },
  { 'min_version' : '19.3', 'fixed_version' : '19.3.1' }
];

vcf::check_version_and_report(
    app_info:app_info,
    constraints:constraints,
    severity:SECURITY_HOLE
);