# CVE-2026-12804: lemonldap-ng: A vulnerability was detected in lemonldap-ng up to 2.23.0

CVE-2026-12804 is fixed in lemonldap-ng on 1 platform, first by DEBIAN-CVE-2026-12804, released June 21, 2026. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2026-12804
- Priority: Routine
- CVSS: n/a
- EPSS: 0.0045
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Jun 21, 2026

## 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."

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | lemonldap-ng Debian 12.15 (bookworm) | 2.16.1+ds-deb12u9 | [DEBIAN-CVE-2026-12804](https://patchblox.com/security/data/fix/linux/debian-cve-2026-12804.md) | Jun 21, 2026 |
| Linux | lemonldap-ng Debian 13.5 (trixie) | 2.21.2+ds-1+deb13u3 | [DEBIAN-CVE-2026-12804](https://patchblox.com/security/data/fix/linux/debian-cve-2026-12804.md) | Jun 21, 2026 |
| Linux | lemonldap-ng Debian 14 | 2.23.1+ds-1 | [DEBIAN-CVE-2026-12804](https://patchblox.com/security/data/fix/linux/debian-cve-2026-12804.md) | Jun 21, 2026 |

---

Data as of 2026-11-08T13:06:02Z UTC. Source: Patchblox Patch Radar (https://patchblox.com/security/patch-radar). Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

Free to use with attribution: show "Data: Patchblox Patch Radar" with a link to https://patchblox.com/security/patch-radar. Terms, including what needs a written agreement: https://patchblox.com/security/patch-radar/use-the-data

Product names, logos and trademarks shown on Patch Radar belong to their respective owners. They are used only to identify the software each security fix applies to and to help readers find their platform. Their use does not imply any affiliation with, or endorsement by, those owners, and Patchblox is not affiliated with any of them.