How severe is CVE-2021-40889?

CVE-2021-40889 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2021-40889 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (76th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-40889?

CVE-2021-40889 affects Cmsuno Project Cmsuno. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2021-40889?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.

When was CVE-2021-40889 published?

CVE-2021-40889 was published on 2021-10-11 and last updated on 2026-06-17.

CVE-2021-40889

CVE-2021-40889 is a critical-severity vulnerability in Cmsuno Project Cmsuno with a CVSS 3.x base score of 9.8. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-94.

Key facts

Severity: Critical (CVSS 3.x base score 9.8)
CVSS v2: 7.5
EPSS exploit prediction: 2% (76th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-94
Affected product: Cmsuno Project Cmsuno
Published: 2021-10-11
Last modified: 2026-06-17

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.

Frequently asked questions

What is CVE-2021-40889?: 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.
How severe is CVE-2021-40889?: CVE-2021-40889 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2021-40889 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (76th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-40889?: CVE-2021-40889 affects Cmsuno Project Cmsuno. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2021-40889?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
When was CVE-2021-40889 published?: CVE-2021-40889 was published on 2021-10-11 and last updated on 2026-06-17.

References

https://github.com/boiteasite/cmsuno/issues/19

Affected products (1)

cpe:2.3:a:cmsuno_project:cmsuno:1.7.2:*:*:*:*:*:*:*

More vulnerabilities in Cmsuno Project Cmsuno

CVE-2020-25557 — High (CVSS 8.8): In CMSuno 1.6.2, an attacker can inject malicious PHP code as a "username" while changing his/her username & password.…
CVE-2020-25538 — High (CVSS 8.8): An authenticated attacker can inject malicious code into "lang" parameter in /uno/central.php file in CMSuno 1.6.2 and…
CVE-2020-15600 — Medium (CVSS 6.5): An issue was discovered in CMSUno before 1.6.1. uno.php allows CSRF to change the admin password.
CVE-2018-15567 — Medium (CVSS 6.1): CMSUno before 1.5.3 has XSS via the title field.
CVE-2021-36654 — Medium (CVSS 5.4): CMSuno 1.7 is vulnerable to an authenticated stored cross site scripting in modifying the filename parameter (tgo)…

All CVEs affecting Cmsuno Project Cmsuno →

Other CWE-94 (Code Injection) vulnerabilities

CVE-2026-57624 — Critical (CVSS 10.0): Unauthenticated Remote Code Execution (RCE) in Blocksy Companion Pro <= 2.1.46 versions.
CVE-2026-10134 — Critical (CVSS 10.0): IBM Langflow OSS 1.0.0 through 1.9.3 allows an attacker to read every secret available to the Langflow process, read…
CVE-2026-53576 — Critical (CVSS 10.0): Kestra is an open-source, event-driven orchestration platform. Prior to 1.0.45 and 1.3.21, the authentication filter…
CVE-2026-10561 — Critical (CVSS 10.0): IBM Langflow OSS 1.0.0 through 1.9.3 has an vulnerability due to an improper isolation of Python execution combined…
CVE-2026-25470 — Critical (CVSS 10.0): Improper Control of Generation of Code ('Code Injection') vulnerability in ACPT ACPT (Pro) - Custom Post Types Plugin…
CVE-2026-48836 — Critical (CVSS 10.0): Unauthenticated Remote Code Execution (RCE) in Easy Invoice <= 2.1.19 versions.

Browse all CWE-94 (Code Injection) vulnerabilities →