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Vulnerability record · CVE-2021-43834 · published 16 December 2021

CVE-2021-43834: Elabftw improper authentication vulnerability

Elabftw · Elabftw

eLabFTW is an electronic lab notebook manager for research teams. In versions prior to 4.2.0 there is a vulnerability which allows an attacker to authenticate as an existing user, if that user was created using a single sign-on authentication option such as LDAP or SAML. It impacts instances where LDAP or SAML is used for authentication instead of the (default) local password mechanism. Users should upgrade to at least version 4.2.0.

9.8 CVSS 3.1 Critical EPSS 0.98% · top 39.3% CWE-287 · Improper authentication
9.8CVSS 3.1 base score, v2 6.5
0.98%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
4References
17 Jun 2026Last modified by NVD

Description

eLabFTW is an electronic lab notebook manager for research teams. In versions prior to 4.2.0 there is a vulnerability which allows an attacker to authenticate as an existing user, if that user was created using a single sign-on authentication option such as LDAP or SAML. It impacts instances where LDAP or SAML is used for authentication instead of the (default) local password mechanism. Users should upgrade to at least version 4.2.0.

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://github.com/elabftw/elabftw/releases/tag/4.2.0 Release NotesThird Party Advisory
https://github.com/elabftw/elabftw/security/advisories/GHSA-98rp-gx76-33ph Third Party Advisory
https://github.com/elabftw/elabftw/releases/tag/4.2.0 Release NotesThird Party Advisory
https://github.com/elabftw/elabftw/security/advisories/GHSA-98rp-gx76-33ph Third Party Advisory

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

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Source: NIST National Vulnerability Database (record CVE-2021-43834), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.