CVE-2026-12804

Name	CVE-2026-12804
Description	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."
Source	CVE (at NVD; CERT, ENISA, LWN, oss-sec, fulldisc, Debian ELTS, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more)
References	DLA-4734-1, DSA-6434-1

Vulnerable and fixed packages

The table below lists information on source packages.

Source Package	Release	Version	Status
lemonldap-ng (PTS)	bullseye	2.0.11+ds-4+deb11u5	vulnerable
	bullseye (security)	2.0.11+ds-4+deb11u9	fixed
	bookworm	2.16.1+ds-deb12u8	vulnerable
	bookworm (security)	2.16.1+ds-deb12u9	fixed
	trixie	2.21.2+ds-1+deb13u2	vulnerable
	trixie (security)	2.21.2+ds-1+deb13u3	fixed
	forky	2.23.2+ds-2	fixed
	sid	2.23.3+ds-1	fixed

The information below is based on the following data on fixed versions.

Package	Type	Release	Fixed Version	Origin
lemonldap-ng	source	bullseye	2.0.11+ds-4+deb11u9	DLA-4734-1
lemonldap-ng	source	bookworm	2.16.1+ds-deb12u9	DLA-4734-1
lemonldap-ng	source	trixie	2.21.2+ds-1+deb13u3	DSA-6434-1
lemonldap-ng	source	(unstable)	2.23.1+ds-1

Notes

https://gitlab.ow2.org/lemonldap-ng/lemonldap-ng/-/work_items/3619
https://gitlab.ow2.org/lemonldap-ng/lemonldap-ng/-/merge_requests/979
Fixed by: https://gitlab.ow2.org/lemonldap-ng/lemonldap-ng/-/commit/478bed8e58f0457235e0916e3f73a85a2f19471f (v2.23.1)