Open Redirect in Lemonldap-Ng
CVE-2026-12804
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."
Vulnerability class: Open Redirect
EPSS: 0.003 (18.1th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 4.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N.
Affected products
- N/a Lemonldap-ng — versions 2.0, 2.1, 2.2
Weakness classification (CWE)
References
- cna@vuldb.com (third-party-advisory)
- cna@vuldb.com (third-party-advisory)
- cna@vuldb.com (technical-description, vdb-entry)
- cna@vuldb.com (signature, permissions-required)
- cna@vuldb.com (related)
- cna@vuldb.com (patch)
Frequently asked questions
- What is CVE-2026-12804?
- CVE-2026-12804 is a medium-severity vulnerability in Lemonldap-Ng, classified under URL Redirection to Untrusted Site (Open Redirect). CVSS score: 4.3/10. Published 2026-06-21.
- How severe is CVE-2026-12804?
- Medium severity. CVSS v3 base score is 4.3 out of 10.