Lemonldap::NG::Portal versions from 2.0.0 before 2.16.9, from 2.17.0 before 2.21.5, from 2.22.0 before 2.23.3 for Perl allow authentication bypass via an OAuth2 state parameter stored as an SSO session in the GitHub and LinkedIn backends

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-19349
StatePUBLISHED
AssignerCPANSec
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-08-16 14:16:54 UTC
Updated2026-08-16 17:17:04 UTC
DescriptionLemonldap::NG::Portal versions from 2.0.0 before 2.16.9, from 2.17.0 before 2.21.5, from 2.22.0 before 2.23.3 for Perl allow authentication bypass via an OAuth2 state parameter stored as an SSO session in the GitHub and LinkedIn backends. Before redirecting to the identity provider, extractFormInfo() creates the state session with the positional call `getApacheSession( undef, 1, 0, 'GitHubState' )`. getApacheSession() takes a session id followed by a named argument hash, so the trailing arguments become that hash, `kind` defaults to SSO, and the state is written to the global session storage as a regular SSO session. Its identifier is handed to the unauthenticated visitor as the state parameter of the redirection URL. Any visitor who reaches the GitHub or LinkedIn endpoint can replay that identifier as a session cookie and obtain a valid SSO session without authenticating. The session holds neither _user nor authenticationLevel, which the shipped bootstrap configuration accepts because it grants virtual hosts a "default => accept" access rule; deployments whose rules test the user or require an authentication level are less exposed. Only configurations with the GitHub or LinkedIn authentication module enabled are affected.

Risk And Classification

Problem Types: CWE-305 | CWE-628 | CWE-305 CWE-305 Authentication Bypass by Primary Weakness | CWE-628 CWE-628 Function Call with Incorrectly Specified Arguments

References

ReferenceSourceLinkTags
gitlab.ow2.org/lemonldap-ng/lemonldap-ng/-/releases/v2.16.9 9b29abf9-4ab0-4765-b253-1875cd9b441e gitlab.ow2.org
gitlab.ow2.org/lemonldap-ng/lemonldap-ng/-/releases/v2.23.3 9b29abf9-4ab0-4765-b253-1875cd9b441e gitlab.ow2.org
gitlab.ow2.org/lemonldap-ng/lemonldap-ng/-/releases/v2.21.5 9b29abf9-4ab0-4765-b253-1875cd9b441e gitlab.ow2.org
www.openwall.com/lists/oss-security/2026/08/16/2 af854a3a-2127-422b-91ae-364da2661108 www.openwall.com
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

Additional Advisory Data

Solutions

CNA: Upgrade to Lemonldap-NG-Portal 2.16.9, 2.21.5 or 2.23.3 or later. Only 2.23.3 is on CPAN; the 2.16.9 and 2.21.5 LTS releases are available from https://lemonldap-ng.org/download.html.

Workarounds

CNA: For deployments that cannot upgrade, disable the GitHub and LinkedIn authentication modules.

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