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No exploitation reportedFix available

CVE-2026-19349

No exploitation reported by the sources we read.

  • Published2026-08-16
  • WeaknessCWE-305 · CWE-628

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

Description

Lemonldap::NG::Portal versions from 2.0.0 before 2.16.9, from 2.17.0 before 2.21.5, from 2.22.0 before 2.23.3 for Perl allow authentication bypass via an OAuth2 state parameter stored as an SSO session in the GitHub and LinkedIn backends. Before redirecting to the identity provider, extractFormInfo() creates the state session with the positional call `getApacheSession( undef, 1, 0, 'GitHubState' )`. getApacheSession() takes a session id followed by a named argument hash, so the trailing arguments become that hash, `kind` defaults to SSO, and the state is written to the global session storage as a regular SSO session. Its identifier is handed to the unauthenticated visitor as the state parameter of the redirection URL. Any visitor who reaches the GitHub or LinkedIn endpoint can replay that identifier as a session cookie and obtain a valid SSO session without authenticating. The session holds neither _user nor authenticationLevel, which the shipped bootstrap configuration accepts because it grants virtual hosts a "default => accept" access rule; deployments whose rules test the user or require an authentication level are less exposed. Only configurations with the GitHub or LinkedIn authentication module enabled are affected.

Timeline

dates in UTC
  1. 2026-08-1614:16CVE publishedNVD

Versions per branch

Products declared by the CNA1 product

As CPANSec, the CNA that assigned this CVE, declared them in the CVE record; versions as written.

  • Lemonldap-NG-Portalother versions: not affected

    https://cpan.org/modules

    Affected
    • ≥ 2.0.0, < 2.16.9fixed in 2.16.9custom
    • ≥ 2.17.0, < 2.21.5fixed in 2.21.5custom
    • ≥ 2.22.0, < 2.23.3fixed in 2.23.3custom

Source: the CNA record (CVE Program), © The MITRE Corporation,CVE Terms of UseCVE recordupdated 2026-08-16

Distribution builds and vendor advisories

Packages from OSV.dev and products from the vendors' CSAF advisories.

version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.

Packages

  • lemonldap-ngUbuntu:26.10all versions · no fixed version listed
  • lemonldap-ngUbuntu:26.04:LTSall versions · no fixed version listed
  • lemonldap-ngUbuntu:24.04:LTSall versions · no fixed version listed
  • lemonldap-ngUbuntu:22.04:LTSall versions · no fixed version listed
  • lemonldap-ngUbuntu:20.04:LTSall versions · no fixed version listed
  • lemonldap-ngUbuntu:18.04:LTSall versions · no fixed version listed
  • lemonldap-ngUbuntu:16.04:LTSall versions · no fixed version listed
  • lemonldap-ngDebian:14all versions · fixed in 2.23.3+ds-1

2 more package ranges on OSV.dev

Full record on NVD

Fix

No fix published by the sources we read yet. NVD record

Detection

Nuclei template
none so far
ProjectDiscovery
Exploit-DB
no entry
Exploit-DB
Proof of concept
Metasploit modules
none listed
Metasploit Framework

Sources

Identifiers

Technical details

CVSS v3 Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Published
2026-08-16
Last Modified
2026-08-26
NVD status
Deferred
GitHub Advisory
GHSA-4vx7-c7qw-2vx4

Frequently asked questions

What is CVE-2026-19349?

Lemonldap::NG::Portal versions from 2.0.0 before 2.16.9, from 2.17.0 before 2.21.5, from 2.22.0 before 2.23.3 for Perl allow authentication bypass via an OAuth2 state parameter stored as an SSO session in the GitHub and LinkedIn backends. Before redirecting to the identity provider, extractFormInfo() creates the state session with the positional call `getApacheSession( undef, 1, 0, 'GitHubState' )`. getApacheSession() takes a session id followed by a named argument hash, so the trailing arguments become that hash, `kind` defaults to SSO, and the state is written to the global session storage as a regular SSO session. Its identifier is handed to the unauthenticated visitor as the state parameter of the redirection URL. Any visitor who reaches the GitHub or LinkedIn endpoint can replay that identifier as a session cookie and obtain a valid SSO session without authenticating. The session holds neither _user nor authenticationLevel, which the shipped bootstrap configuration accepts because it grants virtual hosts a "default => accept" access rule; deployments whose rules test the user or require an authentication level are less exposed. Only configurations with the GitHub or LinkedIn authentication module enabled are affected.

Is CVE-2026-19349 actively exploited?

Active exploitation of CVE-2026-19349 has not been confirmed. Its EPSS score was 0.8% on 2026-11-08, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2026-19349?

CVE-2026-19349 has a CVSS v3 base score of 9.8 (CRITICAL severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

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