CVE-2026-12804
lemonldap-ng SAML Common Domain Cookie Endpoint CDC.pm redirect
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."
Attack profile
How easy it is to exploit
- Attack vector
- Network
- Complexity
- Low
- Privileges needed
- None
- User interaction
- Passive
What an attacker can affect
- Confidentiality
- None
- Integrity
- Low
- Availability
- None
Exploit likelihood
What each source reports
CVE List Score used
lemonldap-ng SAML Common Domain Cookie Endpoint CDC.pm redirect
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."
- Record
CVE-2026-12804- CVSS 4.0
- 5.3 Medium
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:P - CVSS 3.1
- 4.3 Medium
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 - CVSS 3.0
- 4.3 Medium
CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N/E:P/RL:O/RC:C - CVSS 2.0
- 5.0
AV:N/AC:L/Au:N/C:N/I:P/A:N/E:POC/RL:OF/RC:C - Weakness
- CWE-601
- Updated
- 2026-11-02
EUVDEUVD-2026-38190
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."
- Record
EUVD-2026-38190- CVSS 4.0
- 5.3 Medium
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:P - Updated
- 2026-11-02
GitHub AdvisoriesGHSA-g4v8-q2mr-m933
A vulnerability was detected in lemonldap-ng up to 2.23.0. Impacted is an unknown function in the...
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.
- Record
GHSA-g4v8-q2mr-m933- CVSS 4.0
- 2.1 Low
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:P/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X - CVSS 3.1
- 4.3 Medium
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N - Weakness
- CWE-601
- Updated
- 2026-11-02
NVD
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."
- Record
CVE-2026-12804- CVSS 4.0
- 2.1 Low
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:P/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X - CVSS 3.1
- 4.3 Medium
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N - CVSS 2.0
- 5.0 Medium
AV:N/AC:L/Au:N/C:N/I:P/A:N - Weakness
- CWE-601
- Updated
- 2026-11-02
OSVDEBIAN-CVE-2026-12804
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."
- Record
DEBIAN-CVE-2026-12804- CVSS 4.0
- 2.1 Low
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:P/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X - Updated
- 2026-11-02
OSVUBUNTU-CVE-2026-12804
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."
- Record
UBUNTU-CVE-2026-12804- CVSS 4.0
- 2.1 Low
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:P - CVSS 3.1
- 4.3 Medium
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N - Updated
- 2026-11-02
Affected packages
| Package | Affected | Fixed |
|---|---|---|
lemonldap-ngDebian:12 |
before 2.16.1+ds-deb12u9, plus listed versions 2.16.1+ds-22.16.1+ds-deb12u12.16.1+ds-deb12u22.16.1+ds-deb12u32.16.1+ds-deb12u4 Show 4 moreShow less2.16.1+ds-deb12u52.16.1+ds-deb12u62.16.1+ds-deb12u72.16.1+ds-deb12u8 |
2.16.1+ds-deb12u9 |
lemonldap-ngDebian:13 |
before 2.21.2+ds-1+deb13u3, plus listed versions 2.21.2+ds-12.21.2+ds-1+deb13u12.21.2+ds-1+deb13u2 |
2.21.2+ds-1+deb13u3 |
lemonldap-ngDebian:14 |
before 2.23.1+ds-1, plus listed versions 2.21.2+ds-12.21.2+ds-22.21.3+ds-12.21.3+ds-1~bpo12+12.21.3+ds-1~bpo13+1 Show 14 moreShow less2.22.0+ds-12.22.0+ds-22.22.0+ds-2~bpo13+12.22.1+ds-12.22.1+ds-1~bpo13+12.22.2+ds-12.22.2+ds-1~bpo13+12.22.3+ds-12.22.3+ds-1~bpo13+12.23.0+ds-12.23.0+ds-22.23.0+ds-32.23.0+ds-3~bpo13+12.23.0+ds-4 |
2.23.1+ds-1 |
lemonldap-ngUbuntu:16.04:LTS |
All versions, plus listed versions 1.3.3-11.4.6-11.4.6-21.4.6-3 |
None known |
lemonldap-ngUbuntu:18.04:LTS |
All versions, plus listed versions 1.9.10-11.9.13-21.9.14-11.9.15-11.9.16-2 |
None known |
lemonldap-ngUbuntu:20.04:LTS |
All versions, plus listed versions 2.0.5+ds-22.0.6+ds-22.0.7+ds-2 |
None known |
lemonldap-ngUbuntu:22.04:LTS |
All versions, plus listed versions 2.0.11+ds-42.0.13+ds-32.0.13+ds-3ubuntu1 |
None known |
lemonldap-ngUbuntu:24.04:LTS |
All versions, plus listed versions 2.16.2+ds-12.17.1+ds-12.17.2+ds-12.17.2+ds-22.18.1+ds-12.18.2+ds-1 |
None known |
lemonldap-ngUbuntu:25.10 |
All versions, plus listed versions 2.20.2+ds-1build12.21.0+ds-3 |
None known |
lemonldap-ngUbuntu:26.10 |
All versions, plus listed versions 2.22.2+ds-12.22.3+ds-12.23.0+ds-32.23.0+ds-42.23.2+ds-12.23.2+ds-22.23.3+ds-1 |
None known |
lemonldap-ngUbuntu:26.04:LTS |
All versions, plus listed versions 2.21.0+ds-32.22.0+ds-22.22.1+ds-12.22.2+ds-1 |
None known |
History
| Recorded | Changed | Sources |
|---|---|---|
| first indexed | CVE List, EUVD, GitHub Advisories, NVD, OSV |
Dates are when Every CVE recorded each change. Upstream dates may differ.
In short
CVE-2026-12804 is a medium vulnerability (CVSS 5.3) in lemonldap-ng, published June 21, 2026. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.45%, the 39th percentile. Fixed in lemonldap-ng 2.16.1+ds-deb12u9.