CVE-2021-40889

Name: CVE-2021-40889
Creator: NVD / NIST
Published: 2021-10-11T10:15:07.697+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

CRITICALCVSS 9.8/10EPSS 1.79%

Last modified Jun 17, 2026

CVE-2021-40889 is a critical-severity vulnerability rated 9.8/10 on the CVSS scale. CMSUno version 1.7.2 is affected by a PHP code execution vulnerability. sauvePass action in {webroot}/uno/central.php file calls to file_put_contents() function to write username in password.php file when a user successfully changed their password. EPSS estimates a 1.79% chance of exploitation in the next 30 days.

Description

CMSUno version 1.7.2 is affected by a PHP code execution vulnerability. sauvePass action in {webroot}/uno/central.php file calls to file_put_contents() function to write username in password.php file when a user successfully changed their password. The attacker can inject malicious PHP code into password.php and then use the login function to execute code.

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

1.79%

75.5th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-94

Affected Software

Vendor	Product	Versions
Cmsuno Project	Cmsuno	1.7.2

References

https://github.com/boiteasite/cmsuno/issues/19Exploit, Issue Tracking, Third Party Advisory
https://github.com/boiteasite/cmsuno/issues/19Exploit, Issue Tracking, Third Party Advisory

Timeline

Published: Oct 11, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-40889?

How severe is CVE-2021-40889?

CVE-2021-40889 has a CVSS score of 9.8/10 (CRITICAL severity). The EPSS model estimates a 1.79% probability of exploitation in the next 30 days.

How do I fix CVE-2021-40889?

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-2021-40889?

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

Scan your code now

Source: NVD / NIST