Lemonldap::NG::Portal versions from 2.23.0 before 2.23.4 for Perl allow a PKCE bypass for public Relying Parties in "PKCE or secret" mode because checkEndPointAuthenticationCredentials does not verify the client secret. With oidcRPMetaDataOptionsRequirePKCE set to 2, the authorization endpoint issues a code even when the request carries no code_challenge, and token() admits the exchange as long as a challenge was stored or an authentication method was returned for the caller. checkEndPointAuthenticationCredentials() skips the secret comparison for a Relying Party marked public and still returns the method deduced from the request, so any Basic or form credential satisfies the secret branch. validatePKCEChallenge() then passes, because neither a challenge nor a verifier is present. An attacker who intercepts an authorization code issued to a public Relying Party can exchange it for the user's access, ID and refresh tokens by replaying the client_id with an arbitrary secret, which is the attack PKCE prevents. Dynamic client registration creates every Relying Party in this mode.

The remote Fedora 44 host has a package installed that is affected by multiple vulnerabilities as referenced in the FEDORA-2026-827241e2de advisory.

    Update to 2.23.4

    Fixes CVE-2026-92288, CVE-2026-92289 and CVE-2026-95811

    https://projects.ow2.org/view/lemonldap-ng/lemonldap-ng-2-23-4-is-out/

Tenable has extracted the preceding description block directly from the Fedora security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote Fedora 43 host has a package installed that is affected by multiple vulnerabilities as referenced in the FEDORA-2026-33dcab55b4 advisory.

    Update to 2.23.4

    Fixes CVE-2026-92288, CVE-2026-92289 and CVE-2026-95811

    https://projects.ow2.org/view/lemonldap-ng/lemonldap-ng-2-23-4-is-out/

Tenable has extracted the preceding description block directly from the Fedora security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote Fedora 45 host has a package installed that is affected by multiple vulnerabilities as referenced in the FEDORA-2026-76a3490aa6 advisory.

    Update to 2.23.4

    Fixes CVE-2026-92288, CVE-2026-92289 and CVE-2026-95811

    https://projects.ow2.org/view/lemonldap-ng/lemonldap-ng-2-23-4-is-out/

Tenable has extracted the preceding description block directly from the Fedora security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available.

  - Lemonldap::NG::Portal versions from 2.23.0 before 2.23.4 for Perl allow a PKCE bypass for public Relying     Parties in PKCE or secret mode because checkEndPointAuthenticationCredentials does not verify the client     secret. With oidcRPMetaDataOptionsRequirePKCE set to 2, the authorization endpoint issues a code even when     the request carries no code_challenge, and token() admits the exchange as long as a challenge was stored     or an authentication method was returned for the caller. checkEndPointAuthenticationCredentials() skips     the secret comparison for a Relying Party marked public and still returns the method deduced from the     request, so any Basic or form credential satisfies the secret branch. validatePKCEChallenge() then passes,     because neither a challenge nor a verifier is present. An attacker who intercepts an authorization code     issued to a public Relying Party can exchange it for the user's access, ID and refresh tokens by replaying     the client_id with an arbitrary secret, which is the attack PKCE prevents. Dynamic client registration     creates every Relying Party in this mode. (CVE-2026-92289)

Note that Nessus relies on the presence of the package as reported by the vendor.

ID	Name	Product	Family	Type	Severity
362885	Fedora 44 : lemonldap-ng (2026-827241e2de)	Nessus	Fedora Local Security Checks	Local	critical
362881	Fedora 43 : lemonldap-ng (2026-33dcab55b4)	Nessus	Fedora Local Security Checks	Local	critical
362825	Fedora 45 : lemonldap-ng (2026-76a3490aa6)	Nessus	Fedora Local Security Checks	Local	critical
350002	Linux Distros Unpatched Vulnerability : CVE-2026-92289	Nessus	Misc.	Local	critical

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CVE-2026-92289

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