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Vulnerability · Published Jun 21, 2026 · Assigned by VulDB

CVE-2026-12804lemonldap-ng SAML Common Domain Cookie Endpoint CDC.pm redirect

Medium 4.3

In plain English

A medium-severity open redirect in lemonldap-ng. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 39% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)4.3Medium
Exploit odds (30 days)0.4%top 61.1% of all CVEs
Exploited in the wildNo reportsCISA SSVC: poc
Attack toolingNoneno public tooling known

Official 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."

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
Debian:12lemonldap-ng2.16.1+ds-deb12u9DEBIAN-CVE-2026-12804
Debian:13lemonldap-ng2.21.2+ds-1+deb13u3DEBIAN-CVE-2026-12804
Debian:14lemonldap-ng2.23.1+ds-1DEBIAN-CVE-2026-12804
Ubuntu:22.04:LTSlemonldap-ngno fix listedUBUNTU-CVE-2026-12804
Ubuntu:24.04:LTSlemonldap-ngno fix listedUBUNTU-CVE-2026-12804
Ubuntu:25.10lemonldap-ngno fix listedUBUNTU-CVE-2026-12804
Ubuntu:26.04:LTSlemonldap-ngno fix listedUBUNTU-CVE-2026-12804
Ubuntu:26.10lemonldap-ngno fix listedUBUNTU-CVE-2026-12804

Affected products (as reported)

VendorProductVersions
n/a lemonldap-ng 2.02.12.22.32.42.52.62.7

Weakness: CWE-601 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N/E:P/RL:O/RC:C

References