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 products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| — | lemonldap-ng | 2.0, 2.1, 2.2, 2.3, 2.4, 2.5, 2.6, 2.7, 2.8, 2.9, 2.10, 2.11, 2.12, 2.13, 2.14, 2.15, 2.16, 2.17, 2.18, 2.19, 2.20, 2.21, 2.22, 2.23.0 | — |
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Debian
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 14 | lemonldap-ng | 2.23.1+ds-1 | — |
| Debian 13 | lemonldap-ng | 2.21.2+ds-1+deb13u3 | — |
| Debian 12 | lemonldap-ng | 2.16.1+ds-deb12u9 | — |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 26.10 | lemonldap-ng | No fix yet | — |
| Ubuntu 26.04 LTS | lemonldap-ng | No fix yet | — |
| Ubuntu 25.10 | lemonldap-ng | No fix yet | — |
| Ubuntu 24.04 LTS | lemonldap-ng | No fix yet | — |
| Ubuntu 22.04 LTS | lemonldap-ng | No fix yet | — |
Show 3 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 20.04 LTS | lemonldap-ng | No fix yet | — |
| Ubuntu 18.04 LTS | lemonldap-ng | No fix yet | — |
| Ubuntu 16.04 LTS | lemonldap-ng | No fix yet | — |
References
- VDB-372598 | lemonldap-ng SAML Common Domain Cookie Endpoint CDC.pm redirect vdb-entry technical-description
- VDB-372598 | CTI Indicators (IOB, IOC, TTP, IOA) signature permissions-required
- CVE-2026-12804 | CVE Analysis and Report third-party-advisory
- Submit #836105 | lemonldap lemonldap-ng ca7af863ac5f60d127ba01e8661c0365be374d4b Open Redirect third-party-advisory
- https://gitlab.ow2.org/lemonldap-ng/lemonldap-ng/-/work_items/3619 related
- https://gitlab.ow2.org/lemonldap-ng/lemonldap-ng/-/merge_requests/979 patch