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Vulnerability record · CVE-2021-3309 · published 26 January 2021

CVE-2021-3309: Wekan project wekan improper certificate validation vulnerability

WWekan Project · Wekan

packages/wekan-ldap/server/ldap.js in Wekan before 4.87 can process connections even though they are not authorized by the Certification Authority trust store,

8.1 CVSS 3.1 High EPSS 1.7% · top 23.8% CWE-295 · Improper certificate validation
8.1CVSS 3.1 base score, v2 6.8
1.7%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
6References, 2 tagged exploit
17 Jun 2026Last modified by NVD

Description

packages/wekan-ldap/server/ldap.js in Wekan before 4.87 can process connections even though they are not authorized by the Certification Authority trust store,

CVSS:3.1/AV:N/AC:H/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://github.com/wekan/wekan/issues/3482 ExploitIssue TrackingThird Party Advisory
https://github.com/wekan/wekan/pull/3483/commits/31f89121fecca5a761b05cc3a26d4f237e90b484 PatchThird Party Advisory
https://github.com/wekan/wekan/releases/tag/v4.87 Release NotesThird Party Advisory
https://github.com/wekan/wekan/issues/3482 ExploitIssue TrackingThird Party Advisory
https://github.com/wekan/wekan/pull/3483/commits/31f89121fecca5a761b05cc3a26d4f237e90b484 PatchThird Party Advisory
https://github.com/wekan/wekan/releases/tag/v4.87 Release NotesThird Party 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-2021-3309), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.