Description
A cross-site scripting (XSS) vulnerability in LemonLDAP::NG before 2.19.3 allows remote attackers to inject arbitrary web script or HTML into the login page via a username if userControl has been set to a non-default value that allows special HTML characters.
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 | 2.20.0+ds-1 | — |
| Debian 13 | lemonldap-ng | 2.20.0+ds-1 | — |
| Debian 12 | lemonldap-ng | 2.16.1+ds-deb12u3 | — |
| Debian 11 | lemonldap-ng | 2.0.11+ds-4+deb11u6 | DLA-3979-1 |
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 | — |
Advisories 1
- DLA-3979-1 lemonldap-ng - security update Debian Security (DSA / DLA) · Mar 9, 2026