CVE-2019-15941

Name: CVE-2019-15941
Creator: NVD / NIST
Published: 2019-09-25T20:15:11.057+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

CRITICALCVSS 9.8/10EPSS 2.20%

Last modified Jun 17, 2026

CVE-2019-15941 is a critical-severity vulnerability rated 9.8/10 on the CVSS scale. OpenID Connect Issuer in LemonLDAP::NG 2.x through 2.0.5 may allow an attacker to bypass access control rules via a crafted OpenID Connect authorization request. To be vulnerable, there must exist an OIDC Relaying party within the LemonLDAP configuration with weaker access control rules than the target RP, and no filtering on redirection URIs.. EPSS estimates a 2.20% chance of exploitation in the next 30 days.

Description

OpenID Connect Issuer in LemonLDAP::NG 2.x through 2.0.5 may allow an attacker to bypass access control rules via a crafted OpenID Connect authorization request. To be vulnerable, there must exist an OIDC Relaying party within the LemonLDAP configuration with weaker access control rules than the target RP, and no filtering on redirection URIs.

Metrics

CVSS 3.1

9.8/10

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

EPSS Probability

2.20%

80.2th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-863

Affected Software

Vendor	Product	Versions	Update
Lemonldap-Ng	Lemonldap\	>= 2.0.0, <= 2.0.5	Ng
Debian	Debian Linux	10.0	—

References

https://gitlab.ow2.org/lemonldap-ng/lemonldap-ng/issues/1881Third Party Advisory
https://projects.ow2.org/view/lemonldap-ng/lemonldap-ng-2-0-6-is-out/Third Party Advisory
https://seclists.org/bugtraq/2019/Sep/46Mailing List, Third Party Advisory
https://www.debian.org/security/2019/dsa-4533Third Party Advisory
https://gitlab.ow2.org/lemonldap-ng/lemonldap-ng/issues/1881Third Party Advisory
https://projects.ow2.org/view/lemonldap-ng/lemonldap-ng-2-0-6-is-out/Third Party Advisory
https://seclists.org/bugtraq/2019/Sep/46Mailing List, Third Party Advisory
https://www.debian.org/security/2019/dsa-4533Third Party Advisory

Timeline

Published: Sep 25, 2019
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2019-15941?

How severe is CVE-2019-15941?

CVE-2019-15941 has a CVSS score of 9.8/10 (CRITICAL severity). The EPSS model estimates a 2.20% probability of exploitation in the next 30 days.

How do I fix CVE-2019-15941?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2019-15941?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST