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Vulnerabilities

Vulnerability · CVE-2026-92288

Lemonldap::NG::Portal versions from 2.20.0 before 2.21.6, from 2.22.0 before 2.23.4 for Perl allow unauthenticated OAuth2 token introspection because checkEndPointAuthenticationCre

Published Sep 25, 2026 · catalog updated Oct 18, 2026 · Lemonldap::NG::Portal versions from 2.20.0

Check if you run it

No confirmed exploitation is on record for CVE-2026-92288. EPSS is 0.37%. Act only if a listed version of Lemonldap::NG::Portal versions from 2.20.0 is installed.

Gaps on this record

  • The stored product name is a package slug. The name on this page is taken from the title (Lemonldap::NG::Portal versions from 2.20.0).
  • No vendor fix or required action is stored. Compare the linked advisory before you change production.
Severity
Critical9.1
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
0.37%
Remediation
Advisory link
Affected products
Debian:13 lemonldap-ng · Debian:14 lemonldap-ng

Lemonldap::NG::Portal versions from 2.20.0 before 2.21.6, from 2.22.0 before 2.23.4 for Perl allow unauthenticated OAuth2 token introspection because checkEndPointAuthenticationCredentials does not verify the client secret of a public Relying Party. checkEndPointAuthenticationCredentials() skips the secret comparison for a Relying Party marked public and still returns the authentication method deduced from the request, client_secret_basic or client_secret_post. introspection() rejects a caller only when that method is missing or none, so a request carrying a public client_id and an arbitrary or empty secret passes the endpoint's authentication check. An attacker who holds an access token and knows the client_id of any public Relying Party can confirm the token is active and read its metadata, including scope, audience, expiry and the sub claim. The sub claim is computed with the calling Relying Party's user identifier attribute, so an attacker can translate a user identifier from one Relying Party to another, defeating per-client and pseudonymous identifiers.

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • Debian:13 lemonldap-ng0 → 2.21.2+ds-1+deb13u4
  • Debian:14 lemonldap-ng0 → 2.23.4+ds-1

How to fix CVE-2026-92288

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

No confirmed exploitation is on record for CVE-2026-92288. EPSS is 0.37%. Act only if a listed version of Lemonldap::NG::Portal versions from 2.20.0 is installed.

Which versions are affected?

Compare what you have installed with 0 → 2.21.2+ds-1+deb13u4, 0 → 2.23.4+ds-1. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

No weakness class is stored. EPSS 0.37%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Technology hubs

Debian security

Code

The project this record applies to. Exploit listings stay in References.

No public source repository is identified for this product.

Timeline

Detection, updates, and resolution for this record.

  1. Sep 25, 2026 · Trivy Vulnerability DB

    Detected

    Lemonldap::NG::Portal versions from 2.20.0 before 2.21.6, from 2.22.0 before 2.23.4 for Perl allow unauthenticated OAuth2 token introspection because checkEndPointAuthenticationCredentials does not verify the client secret of a public Relying Party. checkEndPointAuthenticationCredentials() skips the secret comparison for a Relying Party marked public and still returns the authentication method ded

  2. Oct 18, 2026 · Trivy Vulnerability DB

    Fix available

    lemonldap-ng fixed in 2.21.2+ds-1+deb13u4; lemonldap-ng fixed in 2.23.4+ds-1

  3. Oct 18, 2026 · Trivy Vulnerability DB

    Fix available

    lemonldap-ng fixed in 2.21.2+ds-1+deb13u4

  4. Oct 18, 2026 · Trivy Vulnerability DB

    Fix available

    lemonldap-ng fixed in 2.23.4+ds-1

  5. Oct 18, 2026 · Trivy Vulnerability DB

    Updated

    Lemonldap::NG::Portal versions from 2.20.0 before 2.21.6, from 2.22.0 before 2.23.4 for Perl allow unauthenticated OAuth2 token introspection because checkEndPointAuthenticationCredentials does not verify the client secret of a public Relying Party. checkEndPointAuthenticationCredentials() skips the secret comparison for a Relying Party marked public and still returns the authentication method ded

Sources

  • CVE.orgVulnerability recordCVE-2026-92288

    Official CVE identifier

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2026-92288

    30-day exploitation probability 0.4%

    first.org
  • OpenSSF OSV / OSV ScannerPackage advisoryDEBIAN-CVE-2026-92288
    osv.dev
  • Trivy Vulnerability DBPackage advisoryDEBIAN-CVE-2026-92288

    Lemonldap::NG::Portal versions from 2.20.0 before 2.21.6, from 2.22.0 before 2.23.4 for Perl allow unauthenticated OAuth2 token introspection because checkEndPointAuthenticationCredentials does not verify the client secret of a public Relying Party. checkEndPointAuthenticationCre

    osv.dev

References

Freshness

Last verified in this catalog Oct 18, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.