CVE-2020-26542

Name: CVE-2020-26542
Creator: NVD / NIST
Published: 2020-11-09T20:15:13.323+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

CRITICALCVSS 9.8/10EPSS 1.52%

Last modified Jun 17, 2026

CVE-2020-26542 is a critical-severity vulnerability rated 9.8/10 on the CVSS scale. 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.. EPSS estimates a 1.52% chance of exploitation in the next 30 days.

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.

Metrics

CVSS 3.1

9.8/10

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

EPSS Probability

1.52%

71.4th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-287

Affected Software

Vendor	Product	Versions
Percona	Percona Server	<= 2020-10-02

References

https://jira.percona.com/browse/PS-7358Issue Tracking, Permissions Required, Vendor Advisory
https://jira.percona.com/browse/PSMDB-726Issue Tracking, Permissions Required, Vendor Advisory
https://www.percona.com/blog/2020/10/13/percona-distribution-for-mysql-pxc-variant-8-0-20-fixes-for-security-vulnerability-release-roundup-october-13-2020/Release Notes, Vendor Advisory
https://www.percona.com/doc/percona-distribution-mysql/8.0/release-notes-pxc-v8.0.20.upd2.htmlRelease Notes, Vendor Advisory
https://jira.percona.com/browse/PS-7358Issue Tracking, Permissions Required, Vendor Advisory
https://jira.percona.com/browse/PSMDB-726Issue Tracking, Permissions Required, Vendor Advisory
https://www.percona.com/blog/2020/10/13/percona-distribution-for-mysql-pxc-variant-8-0-20-fixes-for-security-vulnerability-release-roundup-october-13-2020/Release Notes, Vendor Advisory
https://www.percona.com/doc/percona-distribution-mysql/8.0/release-notes-pxc-v8.0.20.upd2.htmlRelease Notes, Vendor Advisory

Timeline

Published: Nov 9, 2020
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2020-26542?

How severe is CVE-2020-26542?

CVE-2020-26542 has a CVSS score of 9.8/10 (CRITICAL severity). The EPSS model estimates a 1.52% probability of exploitation in the next 30 days.

How do I fix CVE-2020-26542?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2020-26542?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST