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Vulnerability record · CVE-2020-26542 · published 9 November 2020

CVE-2020-26542: Percona server improper authentication vulnerability

Percona · Percona Server

An issue was discovered in the MongoDB Simple LDAP plugin through 2020-10-02 for Percona Server when using the SimpleLDAP authentication in conjunction with Microsoft’s Active Directory, Percona has discovered a flaw that would allow authentication to complete when passing a blank value for the account password, leading to access against the service integrated with which Active Directory is deployed at the level granted to the authenticating account.

9.8 CVSS 3.1 Critical EPSS 1.5% · top 26.1% CWE-287 · Improper authentication
9.8CVSS 3.1 base score, v2 7.5
1.5%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
8References
17 Jun 2026Last modified by NVD

Description

An issue was discovered in the MongoDB Simple LDAP plugin through 2020-10-02 for Percona Server when using the SimpleLDAP authentication in conjunction with Microsoft’s Active Directory, Percona has discovered a flaw that would allow authentication to complete when passing a blank value for the account password, leading to access against the service integrated with which Active Directory is deployed at the level granted to the authenticating account.

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

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://jira.percona.com/browse/PS-7358 Issue TrackingPermissions RequiredVendor Advisory
https://jira.percona.com/browse/PSMDB-726 Issue TrackingPermissions RequiredVendor Advisory
https://www.percona.com/blog/2020/10/13/percona-distribution-for-mysql-pxc-variant-8-0-20-fixes-for-security-vulnerabili Release NotesVendor Advisory
https://www.percona.com/doc/percona-distribution-mysql/8.0/release-notes-pxc-v8.0.20.upd2.html Release NotesVendor Advisory
https://jira.percona.com/browse/PS-7358 Issue TrackingPermissions RequiredVendor Advisory
https://jira.percona.com/browse/PSMDB-726 Issue TrackingPermissions RequiredVendor Advisory
https://www.percona.com/blog/2020/10/13/percona-distribution-for-mysql-pxc-variant-8-0-20-fixes-for-security-vulnerabili Release NotesVendor Advisory
https://www.percona.com/doc/percona-distribution-mysql/8.0/release-notes-pxc-v8.0.20.upd2.html Release NotesVendor Advisory

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

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Source: NIST National Vulnerability Database (record CVE-2020-26542), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.