CVE-2026-92288 Lemonldap::NG::Portal - Authentication Bypass

Lemonldap::NG::Portal 2.20.0 < 2.21.6 and 2.22.0 < 2.23.4 contains an information disclosure caused by missing client secret verification for public Relying Parties in OAuth2 token introspection, letting unauthenticated attackers confirm token activity and read metadata, exploit requires attacker to know a public client_id and hold an access token.

CVSS base score 9.1 /10
Critical
CISA KEV
Not listed
Public exploit
None known
Authentication
Not required
EPSS
0.37% chance of exploitation in 30 days
View the NVD record ↗

Details

Type
Authentication Bypass
Impact
Information Disclosure
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
Published
25 September 2026
Updated
15 October 2026
Weakness
CWE-1390

Vendor fix

Upgrade to versions 2.21.6, 2.23.4 or later.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

References

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