CVE-2021-43834

Name: CVE-2021-43834
Creator: NVD / NIST
Published: 2021-12-16T00:15:07.507+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

CRITICALCVSS 9.8/10EPSS 0.98%

Last modified Jun 17, 2026

CVE-2021-43834 is a critical-severity vulnerability rated 9.8/10 on the CVSS scale. 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. EPSS estimates a 0.98% chance of exploitation in the next 30 days.

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.

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

0.98%

57.6th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-287

Affected Software

Vendor	Product	Versions
Elabftw	Elabftw	< 4.2.0

References

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

Timeline

Published: Dec 16, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-43834?

How severe is CVE-2021-43834?

CVE-2021-43834 has a CVSS score of 9.8/10 (CRITICAL severity). The EPSS model estimates a 0.98% probability of exploitation in the next 30 days.

How do I fix CVE-2021-43834?

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-2021-43834?

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

Scan your code now

Source: NVD / NIST