GitLab 13.11 < 18.11.7 / 19.0 < 19.0.4 / 19.1 < 19.1.2 (CVE-2026-6896)

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

include('compat.inc');

if (description)
{
  script_id(325832);
  script_version("1.2");
  script_set_attribute(attribute:"plugin_modification_date", value:"2026/07/10");

  script_cve_id("CVE-2026-6896");

  script_name(english:"GitLab 13.11 < 18.11.7 / 19.0 < 19.0.4 / 19.1 < 19.1.2 (CVE-2026-6896)");

  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 13.11 before 18.11.7, 19.0 before
    19.0.4, and 19.1 before 19.1.2 that under certain conditions could have allowed an authenticated user with
    developer-role permissions to execute arbitrary scripts in another user's browser session due to improper
    sanitization of user-supplied input. (CVE-2026-6896)

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-2026-6896.json
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?9caa4a25");
  script_set_attribute(attribute:"see_also", value:"https://gitlab.com/gitlab-org/gitlab/-/work_items/597887");
  script_set_attribute(attribute:"see_also", value:"https://hackerone.com/reports/3682085");
  # https://docs.gitlab.com/releases/patches/patch-release-gitlab-19-1-2-released/
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?04395137");
  script_set_attribute(attribute:"solution", value:
"Upgrade to GitLab version 18.11.7, 19.0.4, 19.1.2 or later.");
  script_set_attribute(attribute:"agent", value:"unix");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:S/C:P/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:C/C:L/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-2026-6896");

  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:"2026/07/08");
  script_set_attribute(attribute:"patch_publication_date", value:"2026/07/08");
  script_set_attribute(attribute:"plugin_publication_date", value:"2026/07/09");

  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_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 =~ "^18\.(11)$" || app_info.version =~ "^19\.(0|1)$"))
  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' : '13.11', 'fixed_version' : '18.11.7' },
  { 'min_version' : '19.0', 'fixed_version' : '19.0.4' },
  { 'min_version' : '19.1', 'fixed_version' : '19.1.2' }
];

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