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."

The remote Debian 13 host has packages installed that are affected by multiple vulnerabilities as referenced in the dsa-6434 advisory.

    - -------------------------------------------------------------------------     Debian Security Advisory DSA-6434-1                   security@debian.org     https://www.debian.org/security/                       Moritz Muehlenhoff     August 12, 2026                       https://www.debian.org/security/faq
    - -------------------------------------------------------------------------

    Package        : lemonldap-ng     CVE ID         : CVE-2026-12804 CVE-2026-19349

    It was discovered that the Lemonldap::NG web SSO system insufficiently     enforced access when using the GitHub/Linkedin authentication backends.

    For the stable distribution (trixie), these problems have been fixed in     version 2.21.2+ds-1+deb13u3.

    We recommend that you upgrade your lemonldap-ng packages.

    For the detailed security status of lemonldap-ng please refer to     its security tracker page at:
    https://security-tracker.debian.org/tracker/lemonldap-ng

    Further information about Debian Security Advisories, how to apply     these updates to your system and frequently asked questions can be     found at: https://www.debian.org/security/

    Mailing list: debian-security-announce@lists.debian.org

Tenable has extracted the preceding description block directly from the Debian 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 44 host has a package installed that is affected by multiple vulnerabilities as referenced in the FEDORA-2026-f9b48b47af advisory.

    Update to 2.23.2

    ----

    Update to 2.23.1, fixes CVE-2026-12804

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-2026-1f595e8eb4 advisory.

    Update to 2.23.2

    ----

    Update to 2.23.1, fixes CVE-2026-12804

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.

  - 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. (CVE-2026-12804)

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

ID	Name	Product	Family	Type	Severity
334970	Debian dsa-6434 : lemonldap-ng - security update	Nessus	Debian Local Security Checks	Local	medium
331595	Fedora 44 : lemonldap-ng (2026-f9b48b47af)	Nessus	Fedora Local Security Checks	Local	medium
331594	Fedora 43 : lemonldap-ng (2026-1f595e8eb4)	Nessus	Fedora Local Security Checks	Local	medium
321972	Linux Distros Unpatched Vulnerability : CVE-2026-12804	Nessus	Misc.	Local	medium

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CVE-2026-12804

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