CVE-2021-43833

Name: CVE-2021-43833
Creator: NVD / NIST
Published: 2021-12-16T00:15:07.447+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 8.8/10EPSS 0.81%

Last modified Jun 17, 2026

CVE-2021-43833 is a high-severity vulnerability rated 8.8/10 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 any authenticated user to gain access to arbitrary accounts by setting a specially crafted email address. EPSS estimates a 0.81% 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 any authenticated user to gain access to arbitrary accounts by setting a specially crafted email address. This vulnerability impacts all instances that have not set an explicit email domain name allowlist. Note that whereas neither administrators nor targeted users are notified of a change, an attacker will need to control an account. The default settings require administrators to validate newly created accounts. The problem has been patched. Users should upgrade to at least version 4.2.0. For users unable to upgrade enabling an email domain allow list (from Sysconfig panel, Security tab) will completely resolve the issue.

Metrics

CVSS 3.1

8.8/10

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

EPSS Probability

0.81%

52.3th 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-v659-q2fh-v99wThird Party Advisory
https://github.com/elabftw/elabftw/releases/tag/4.2.0Release Notes, Third Party Advisory
https://github.com/elabftw/elabftw/security/advisories/GHSA-v659-q2fh-v99wThird Party Advisory

Timeline

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

Frequently Asked Questions

What is CVE-2021-43833?

How severe is CVE-2021-43833?

CVE-2021-43833 has a CVSS score of 8.8/10 (HIGH severity). The EPSS model estimates a 0.81% probability of exploitation in the next 30 days.

How do I fix CVE-2021-43833?

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-2021-43833?

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

Scan your code now

Source: NVD / NIST