{"id":"CVE-2026-87937","aliases":["DRUPAL-CONTRIB-2026-135","EUVD-2026-107864","GHSA-9m9j-x6cp-vc3f"],"status":"published","title":"Central Authentication System (CAS) Server - Moderately critical - Open redirect - SA-CONTRIB-2026-135","description":"URL Redirection to Untrusted Site ('Open Redirect') vulnerability in Drupal Central Authentication System (CAS) Server allows Fake the Source of Data. This issue affects Central Authentication System (CAS) Server versions: from 0.0.0 to 2.0.4, from 2.1.0 to 2.1.3.","severity":{"version":"3.1","score":6.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N","level":"medium","assessor":"adp","from":"cve"},"epss":{"day":"2026-11-11","score":0.00284,"percentile":0.21208,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"cwes":["CWE-601"],"published":"2026-09-09T17:15:40Z","modified":"2026-10-28T02:30:38Z","fixes":[{"ecosystem":"Packagist:https://packages.drupal.org/8","package":"drupal/cas_server","fixed_in":["2.0.4","2.1.3"],"sources":["osv"]}],"affected":[{"source":"osv","ecosystem":"Packagist:https://packages.drupal.org/8","package":"drupal/cas_server","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.0.4"}]},{"type":"ECOSYSTEM","events":[{"introduced":"2.1.0"},{"fixed":"2.1.3"}]}]}],"products":[{"vendor":"drupal","product":"central authentication system (cas) server"}],"references":[{"url":"https://www.drupal.org/sa-contrib-2026-135","tags":["web"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-87937","tags":["advisory"]},{"url":"https://github.com/advisories/GHSA-9m9j-x6cp-vc3f"},{"url":"https://git.drupalcode.org/project/cas_server","tags":["web"]},{"url":"https://www.drupal.org/project/cas_server","tags":["web"]},{"url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/87xxx/CVE-2026-87937.json","tags":["advisory"]}],"sources":{"cve":[{"id":"CVE-2026-87937","title":"Central Authentication System (CAS) Server - Moderately critical - Open redirect - SA-CONTRIB-2026-135","description":"URL Redirection to Untrusted Site ('Open Redirect') vulnerability in Drupal Central Authentication System (CAS) Server allows Fake the Source of Data. This issue affects Central Authentication System (CAS) Server versions: from 0.0.0 to 2.0.4, from 2.1.0 to 2.1.3.","status":"published","published":"2026-10-22T01:22:04.473Z","modified":"2026-10-22T17:29:54.899Z","cvss":[{"version":"3.1","score":6.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N","level":"medium","assessor":"adp"}],"cwes":["CWE-601"],"updated_at":"2026-11-02T13:37:47.463822Z"}],"euvd":[{"id":"EUVD-2026-107864","description":"URL Redirection to Untrusted Site ('Open Redirect') vulnerability in Drupal Central Authentication System (CAS) Server allows Fake the Source of Data. This issue affects Central Authentication System (CAS) Server versions: from 0.0.0 to 2.0.4, from 2.1.0 to 2.1.3.","status":"published","published":"2026-10-22T01:22:04Z","modified":"2026-10-22T17:29:54Z","cvss":[{"version":"3.1","score":6.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N","level":"medium"}],"updated_at":"2026-11-02T16:59:34.378575Z"}],"ghsa":[{"id":"GHSA-9m9j-x6cp-vc3f","title":"URL Redirection to Untrusted Site ('Open Redirect') vulnerability in Drupal Central...","description":"URL Redirection to Untrusted Site ('Open Redirect') vulnerability in Drupal Central Authentication System (CAS) Server allows Fake the Source of Data. This issue affects Central Authentication System (CAS) Server versions: from 0.0.0 to 2.0.4, from 2.1.0 to 2.1.3.","status":"published","published":"2026-10-22T03:33:39Z","modified":"2026-10-22T18:39:23Z","cvss":[{"version":"3.1","score":6.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N","level":"medium"}],"cwes":["CWE-601"],"updated_at":"2026-11-02T15:14:16.981825Z"}],"nvd":[{"id":"CVE-2026-87937","description":"URL Redirection to Untrusted Site ('Open Redirect') vulnerability in Drupal Central Authentication System (CAS) Server allows Fake the Source of Data. This issue affects Central Authentication System (CAS) Server versions: from 0.0.0 to 2.0.4, from 2.1.0 to 2.1.3.","status":"published","published":"2026-10-22T02:17:03.147Z","modified":"2026-10-22T18:17:31.41Z","cvss":[{"version":"3.1","score":6.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N","level":"medium","assessor":"secondary"}],"cwes":["CWE-601"],"updated_at":"2026-11-02T14:13:02.371082Z"}],"osv":[{"id":"CVE-2026-87937","title":"Central Authentication System (CAS) Server - Moderately critical - Open redirect - SA-CONTRIB-2026-135","description":"URL Redirection to Untrusted Site ('Open Redirect') vulnerability in Drupal Central Authentication System (CAS) Server allows Fake the Source of Data. This issue affects Central Authentication System (CAS) Server versions: from 0.0.0 to 2.0.4, from 2.1.0 to 2.1.3.","status":"published","published":"2026-10-22T01:22:04.473Z","modified":"2026-10-28T02:30:38.831640028Z","cvss":[{"version":"3.1","score":6.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N","level":"medium"}],"cwes":["CWE-601"],"updated_at":"2026-11-02T15:45:19.210277Z"},{"id":"DRUPAL-CONTRIB-2026-135","description":"This module enables you to turn a Drupal install into the Central Authentication System (CAS) Server. It makes your database the primary location for other systems to use for authentication in a SSO environment.\n\nThe module doesn't sufficiently check the service URL used to redirect the user during logout, leading to an open redirect.\n\nThis vulnerability is mitigated by the fact that an attacker must convince a user to click a specially crafted link. The vulnerability cannot be exploited without user interaction and does not allow an attacker to directly compromise the CAS server or bypass authentication.","status":"published","published":"2026-09-09T17:15:40Z","modified":"2026-09-09T19:25:58.494495Z","updated_at":"2026-11-02T15:46:13.900249Z"}]}}