How severe is CVE-2021-3976?

CVE-2021-3976 has a CVSS 3.x base score of 6.5, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is none, integrity high, and availability none.

Is CVE-2021-3976 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (31st percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-3976?

CVE-2021-3976 affects Kimai Kimai 2. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2021-3976?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

When was CVE-2021-3976 published?

CVE-2021-3976 was published on 2021-11-19 and last updated on 2026-06-17.

CVE-2021-3976

CVE-2021-3976 is a medium-severity vulnerability in Kimai Kimai 2 with a CVSS 3.x base score of 6.5. 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-352.

Key facts

Severity: Medium (CVSS 3.x base score 6.5)
CVSS v2: 4.3
EPSS exploit prediction: 0% (31st percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-352
Affected product: Kimai Kimai 2
Published: 2021-11-19
Last modified: 2026-06-17

Description

kimai2 is vulnerable to Cross-Site Request Forgery (CSRF)

Frequently asked questions

What is CVE-2021-3976?: kimai2 is vulnerable to Cross-Site Request Forgery (CSRF)
How severe is CVE-2021-3976?: CVE-2021-3976 has a CVSS 3.x base score of 6.5, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is none, integrity high, and availability none.
Is CVE-2021-3976 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (31st percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-3976?: CVE-2021-3976 affects Kimai Kimai 2. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2021-3976?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2021-3976 published?: CVE-2021-3976 was published on 2021-11-19 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:kimai:kimai_2:*:*:*:*:*:*:*:*

More vulnerabilities in Kimai Kimai 2

CVE-2021-4033 — Medium (CVSS 6.5): kimai2 is vulnerable to Cross-Site Request Forgery (CSRF)
CVE-2019-15481 — Medium (CVSS 6.1): Kimai v2 before 1.1 has XSS via a timesheet description.
CVE-2021-3963 — Medium (CVSS 4.3): kimai2 is vulnerable to Cross-Site Request Forgery (CSRF)
CVE-2021-3957 — Medium (CVSS 4.3): kimai2 is vulnerable to Cross-Site Request Forgery (CSRF)

All CVEs affecting Kimai Kimai 2 →

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