{"id":"CVE-2026-16639","aliases":["DRUPAL-CONTRIB-2026-081","EUVD-2026-66181","GHSA-p748-p4j4-gpx6"],"status":"published","title":"Internationalization Single Sign-On - Critical - Access bypass - SA-CONTRIB-2026-081","description":"Authentication Bypass Using an Alternate Path or Channel vulnerability in Drupal Internationalization Single Sign-On allows Authentication Bypass. This issue affects Internationalization Single Sign-On versions: from 0.0.0 to 1.8.0.","severity":{"version":"3.1","score":9.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"critical","assessor":"adp","from":"cve"},"epss":{"day":"2026-11-09","score":0.00643,"percentile":0.51112,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"cwes":["CWE-288"],"published":"2026-07-22T17:53:35Z","modified":"2026-09-10T03:45:45Z","fixes":[{"ecosystem":"Packagist:https://packages.drupal.org/8","package":"drupal/i18n_sso","fixed_in":["1.8.0"],"sources":["osv"]}],"affected":[{"source":"osv","ecosystem":"Packagist:https://packages.drupal.org/8","package":"drupal/i18n_sso","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.8.0"}]}]}],"products":[{"vendor":"drupal","product":"internationalization single sign-on"}],"references":[{"url":"https://www.drupal.org/sa-contrib-2026-081","tags":["web"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-16639"},{"url":"https://github.com/advisories/GHSA-p748-p4j4-gpx6"}],"sources":{"cve":[{"id":"CVE-2026-16639","title":"Internationalization Single Sign-On - Critical - Access bypass - SA-CONTRIB-2026-081","description":"Authentication Bypass Using an Alternate Path or Channel vulnerability in Drupal Internationalization Single Sign-On allows Authentication Bypass. This issue affects Internationalization Single Sign-On versions: from 0.0.0 to 1.8.0.","status":"published","published":"2026-08-25T22:22:12.799Z","modified":"2026-08-26T15:23:15.811Z","cvss":[{"version":"3.1","score":9.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"critical","assessor":"adp"}],"cwes":["CWE-288"],"updated_at":"2026-11-02T14:20:11.24076Z"}],"euvd":[{"id":"EUVD-2026-66181","description":"Authentication Bypass Using an Alternate Path or Channel vulnerability in Drupal Internationalization Single Sign-On allows Authentication Bypass. This issue affects Internationalization Single Sign-On versions: from 0.0.0 to 1.8.0.","status":"published","published":"2026-08-25T22:22:12Z","modified":"2026-08-26T15:23:15Z","cvss":[{"version":"3.1","score":9.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"critical"}],"updated_at":"2026-11-02T18:01:30.898869Z"}],"ghsa":[{"id":"GHSA-p748-p4j4-gpx6","title":"Authentication Bypass Using an Alternate Path or Channel vulnerability in Drupal...","description":"Authentication Bypass Using an Alternate Path or Channel vulnerability in Drupal Internationalization Single Sign-On allows Authentication Bypass. This issue affects Internationalization Single Sign-On versions: from 0.0.0 to 1.8.0.","status":"published","published":"2026-08-26T00:31:02Z","modified":"2026-08-26T18:31:51Z","cvss":[{"version":"3.1","score":9.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"critical"}],"cwes":["CWE-288"],"updated_at":"2026-11-02T15:10:59.944342Z"}],"nvd":[{"id":"CVE-2026-16639","description":"Authentication Bypass Using an Alternate Path or Channel vulnerability in Drupal Internationalization Single Sign-On allows Authentication Bypass. This issue affects Internationalization Single Sign-On versions: from 0.0.0 to 1.8.0.","status":"published","published":"2026-08-25T23:16:56.673Z","modified":"2026-08-28T15:29:44.967Z","cvss":[{"version":"3.1","score":9.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"critical","assessor":"secondary"}],"cwes":["CWE-288"],"updated_at":"2026-11-02T14:12:41.66469Z"}],"osv":[{"id":"DRUPAL-CONTRIB-2026-081","description":"In a scenario of a multilingual website with different domain names per language, this module enables you to be automatically connected across the language domains if you are logged on the main language domain.\n\nThe module doesn't sufficiently validate a short-lived token, allowing an attacker to bypass access control and authenticate as a victim user.\n\nThis vulnerability is mitigated by the fact that an attacker must appear to originate from the same client IP as the victim.","status":"published","published":"2026-07-22T17:53:35Z","modified":"2026-09-10T03:45:45.971343359Z","updated_at":"2026-11-02T15:46:13.900249Z"}]}}