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CVE-2026-19349 is a critical authentication bypass vulnerability in Lemonldap::NG::Portal affecting certain versions that use the GitHub and LinkedIn OAuth2 backends. The flaw allows an unauthenticated visitor to replay a session identifier used as an OAuth2 state parameter to gain a valid SSO session without proper authentication. This occurs because the state parameter is stored as a regular SSO session lacking user and authentication level attributes, which some default configurations accept. Only deployments with the GitHub or LinkedIn authentication modules enabled are affected. Join the discussion | CVE Database V5 | 08/16/2026, 13:22:34 UTC Added: 08/16/2026, 13:41:46 UTC |
0 A vulnerability was detected in lemonldap-ng up to 2.23.0. Impacted is an unknown function in the library lemonldap-ng-portal/lib/Lemonldap/NG/Portal/CDC.pm of the component SAML Common Domain Cookie Endpoint. Performing a manipulation of the argument url results in open redirect. The attack is possible to be carried out remotely. The exploit is now public and may be used. Applying a patch is the recommended action to fix this issue. The vendor confirms, that "it has been fixed some days ago and will be available in 2.23.1. CDC is quite never used, so the impact is very low." Join the discussion | CVE Database V5 | 06/21/2026, 18:30:07 UTC Added: 06/21/2026, 19:24:12 UTC |
In the portal in LemonLDAP::NG before 2.21.0, cross-site scripting (XSS) allows remote attackers to inject arbitrary web script or HTML (into the login page) via the tab parameter, for Choice authentication. Join the discussion | CVE Database V5 | 01/16/2026, 00:00:00 UTC Added: 01/16/2026, 17:51:37 UTC |
0 Incorrect credential validation in LemonLDAP::NG 2.18.x and 2.19.x before 2.19.2 allows attackers to bypass OAuth2 client authentication via an empty client_password parameter (client secret). Join the discussion | CVE Database V5 | 10/09/2024, 00:00:00 UTC Added: 02/25/2026, 21:43:04 UTC |
0 A cross-site scripting (XSS) vulnerability in LemonLDAP::NG before 2.19.3 allows remote attackers to inject arbitrary web script or HTML into the login page via a username if userControl has been set to a non-default value that allows special HTML characters. Join the discussion | CVE Database V5 | 10/09/2024, 00:00:00 UTC Added: 11/03/2025, 22:38:32 UTC |
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