Bug 2491214 (CVE-2026-12804)

Summary:	CVE-2026-12804 lemonldap-ng: Lemonldap-NG: Open Redirect via URL manipulation in SAML Common Domain Cookie Endpoint
Product:	[Other] Security Response	Reporter:	OSIDB Bzimport <bzimport>
Component:	vulnerability	Assignee:	Product Security DevOps Team <prodsec-dev>
Status:	NEW ---	QA Contact:
Severity:	medium	Docs Contact:
Priority:	medium
Version:	unspecified	CC:	xavier
Target Milestone:	---	Keywords:	Security
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Hardware:	All
OS:	Linux
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Doc Text:	A flaw was found in lemonldap-ng. A remote attacker could exploit this vulnerability by manipulating the 'url' argument within the SAML Common Domain Cookie Endpoint. This manipulation results in an open redirect, potentially leading to users being redirected to arbitrary malicious websites.	Story Points:	---
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oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:
Bug Depends On:	2491282, 2491283
Bug Blocks:

Description OSIDB Bzimport 2026-06-21 20:01:14 UTC

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. The vendor was contacted early about this disclosure but did not respond in any way.

Comment 2 Xavier Bachelot 2026-06-22 07:40:52 UTC

Upstream fix : https://gitlab.ow2.org/lemonldap-ng/lemonldap-ng/-/merge_requests/979

This functionality is barely used, the impact is very low.