CVE-2026-12804
lemonldap-ng SAML Common Domain Cookie Endpoint CDC.pm redirect
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."
INFO
Published Date :
June 21, 2026, 7:16 p.m.
Last Modified :
June 22, 2026, 6:24 p.m.
Remotely Exploit :
Yes !
Source :
[email protected]
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS | 134c704f-9b21-4f2e-91b3-4a467353bcc0 | |||||
| CVSS 2.0 | MEDIUM | [email protected] | ||||
| CVSS 3.1 | MEDIUM | [email protected] | ||||
| CVSS 4.0 | LOW | [email protected] |
Solution
- Update lemonldap-ng to a version that fixes the redirect vulnerability.
- Restrict or validate the 'url' parameter in the SAML CDC endpoint.
- Implement strict input validation on redirect URLs.
- Monitor network traffic for suspicious redirection patterns.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-12804.
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-12804 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-12804
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-12804 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-12804 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
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CVE Modified by [email protected]
Jun. 22, 2026
Action Type Old Value New Value Changed 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. The vendor was contacted early about this disclosure but did not respond in any way. 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." Added Reference https://gitlab.ow2.org/lemonldap-ng/lemonldap-ng/-/merge_requests/979 Added Reference https://gitlab.ow2.org/lemonldap-ng/lemonldap-ng/-/work_items/3619 -
CVE Modified by 134c704f-9b21-4f2e-91b3-4a467353bcc0
Jun. 22, 2026
Action Type Old Value New Value Added SSVC {'id': 'CVE-2026-12804', 'role': 'CISA Coordinator', 'options': [{'exploitation': 'poc'}, {'automatable': 'no'}, {'technicalImpact': 'partial'}], 'version': '2.0.3', 'timestamp': '2026-06-22T10:27:57.331935Z'} -
New CVE Received by [email protected]
Jun. 21, 2026
Action Type Old Value New Value Added Affected [{'cpes': ['cpe:2.3:a:lemonldap-ng:lemonldap-ng:*:*:*:*:*:*:*:*'], 'vendor': 'n/a', 'modules': ['SAML Common Domain Cookie Endpoint'], 'product': 'lemonldap-ng', 'versions': [{'status': 'affected', 'version': '2.0'}, {'status': 'affected', 'version': '2.1'}, {'status': 'affected', 'version': '2.2'}, {'status': 'affected', 'version': '2.3'}, {'status': 'affected', 'version': '2.4'}, {'status': 'affected', 'version': '2.5'}, {'status': 'affected', 'version': '2.6'}, {'status': 'affected', 'version': '2.7'}, {'status': 'affected', 'version': '2.8'}, {'status': 'affected', 'version': '2.9'}, {'status': 'affected', 'version': '2.10'}, {'status': 'affected', 'version': '2.11'}, {'status': 'affected', 'version': '2.12'}, {'status': 'affected', 'version': '2.13'}, {'status': 'affected', 'version': '2.14'}, {'status': 'affected', 'version': '2.15'}, {'status': 'affected', 'version': '2.16'}, {'status': 'affected', 'version': '2.17'}, {'status': 'affected', 'version': '2.18'}, {'status': 'affected', 'version': '2.19'}, {'status': 'affected', 'version': '2.20'}, {'status': 'affected', 'version': '2.21'}, {'status': 'affected', 'version': '2.22'}, {'status': 'affected', 'version': '2.23.0'}]}] Added 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. The vendor was contacted early about this disclosure but did not respond in any way. Added CVSS V4.0 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 Added CVSS V3.1 AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N Added CVSS V2 (AV:N/AC:L/Au:N/C:N/I:P/A:N) Added CWE CWE-601 Added Reference https://vuldb.com/cve/CVE-2026-12804 Added Reference https://vuldb.com/submit/836105 Added Reference https://vuldb.com/vuln/372598 Added Reference https://vuldb.com/vuln/372598/cti