CVE-2023-28862Public exploitNetwork attack vector

Two-factor bypass via retained AuthBasic sessions

Published Mar 31, 2023 · Updated Feb 14, 2025

Improper authentication in LemonLDAP::NG before 2.16.1 allows remote attackers to bypass two-factor verification through AuthBasic. The AuthBasic handler generates weak session identifiers and retains a stored session when a password-check plugin rejects session creation after the store step. Exploitation requires a valid primary password for an account subject to two-factor authentication and grants password-only access as that account.

CVSS severity9.8
Critical
EPSS probability0.96%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper authentication in LemonLDAP::NG before 2.16.1 allows remote attackers to bypass two-factor verification through AuthBasic. The AuthBasic handler generates weak session identifiers and retains a stored session when a password-check plugin rejects session creation after the store step. Exploitation requires a valid primary password for an account subject to two-factor authentication and grants password-only access as that account.

The record

CVE
CVE-2023-28862
Published
Mar 31, 2023
Updated
Feb 14, 2025
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-287, T1078
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Mar 31, 2023CVE publishedPublication date reported by the CVE source.
  2. Feb 14, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

9.8NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-287Improper Authentication
T1078Valid Accounts

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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