CVE-2023-28862: An issue was discovered in LemonLDAP::NG before 2.16.1

Q: How do I fix CVE-2023-28862?

lemonldap\: upgrade to 2.16.1. Exact commands for each OS are on this page.

Q: Is CVE-2023-28862 being exploited?

CVE-2023-28862 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2023-28862 affect?

CVE-2023-28862 affects lemonldap\. Severity is critical (CVSS 9.8). An issue was discovered in LemonLDAP::NG before 2.16.1. Weak session ID generation in the AuthBasic handler and incorrect failure handling during a password check allow attackers to bypass 2FA verification. Any plugin that tries to deny ses

Q: How urgent is CVE-2023-28862?

Priority 60/100. Critical severity; Public exploit reference; Remotely exploitable, no login, no user action

This week

CRITICAL 9.8REMOTEUPGRADE

CVE-2023-28862 is a critical-severity flaw (CVSS 9.8) affecting lemonldap\. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

An issue was discovered in LemonLDAP::NG before 2.16.1. Weak session ID generation in the AuthBasic handler and incorrect failure handling during a password check allow attackers to bypass 2FA verification. Any plugin that tries to deny session creation after the store step does not deny an AuthBasic session.

Why this priority

Critical severity
Public exploit reference
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	9.8 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	1.0% (top 39%)
CISA exploited list	No
Weakness	CWE-287
Published	2023-03-31
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: lemonldap-ng

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2023-03-31 17:15 UTCPublished CVE record published
2026-06-17 05:48 UTCUpdated Record last modified

lemonldap-ng lemonldap\ UPGRADE

Affected: < 2.16.1

Fixed in: 2.16.1

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy lemonldap || rpm -q lemonldap || lemonldap --version

2. UPGRADE to 2.16.1 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade lemonldap

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade lemonldap

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2023-28862?

lemonldap\: upgrade to 2.16.1. Exact commands for each OS are on this page.

Is CVE-2023-28862 being exploited?

CVE-2023-28862 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2023-28862 affect?

CVE-2023-28862 affects lemonldap\. Severity is critical (CVSS 9.8). An issue was discovered in LemonLDAP::NG before 2.16.1. Weak session ID generation in the AuthBasic handler and incorrect failure handling during a password check allow attackers to bypass 2FA verification. Any plugin that tries to deny ses

How urgent is CVE-2023-28862?

Priority 60/100. Critical severity; Public exploit reference; Remotely exploitable, no login, no user action

Related CVEs

CVE-2024-48933 MEDIUM 6.1 UPGRADE A cross-site scripting (XSS) vulnerability in LemonLDAP::NG before 2.19.3 allows remote attackers to inject ar
CVE-2023-44469 MEDIUM 4.3 UPGRADE A Server-Side Request Forgery issue in the OpenID Connect Issuer in LemonLDAP::NG before 2.17.1 allows authent
CVE-2022-37186 MEDIUM 5.9 UPGRADE In LemonLDAP::NG before 2.0.15
CVE-2019-19791 CRITICAL 9.8 UPGRADE In LemonLDAP::NG (aka lemonldap-ng) before 2.0.7, the default Apache HTTP Server configuration does not proper

References

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