How severe is CVE-2023-53957?

CVE-2023-53957 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-2023-53957 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (39th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2023-53957?

CVE-2023-53957 affects Kimai. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2023-53957?

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.

Does CVE-2023-53957 have an EU (EUVD) identifier?

Yes. CVE-2023-53957 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-204601.

When was CVE-2023-53957 published?

CVE-2023-53957 was published on 2025-12-19 and last updated on 2026-06-17.

CVE-2023-53957

CVE-2023-53957 is a critical-severity vulnerability in Kimai 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-1275.

Key facts

Severity: Critical (CVSS 3.x base score 9.8)
CVSS v4: 8.5
EPSS exploit prediction: 0% (39th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2025-204601
Weakness: CWE-1275
Affected product: Kimai
Published: 2025-12-19
Last modified: 2026-06-17

Description

Kimai 1.30.10 contains a SameSite cookie vulnerability that allows attackers to steal user session cookies through malicious exploitation. Attackers can trick victims into executing a crafted PHP script that captures and writes session cookie information to a file, enabling potential session hijacking.

Frequently asked questions

What is CVE-2023-53957?: Kimai 1.30.10 contains a SameSite cookie vulnerability that allows attackers to steal user session cookies through malicious exploitation. Attackers can trick victims into executing a crafted PHP script that captures and writes session cookie information to a file, enabling potential session hijacking.
How severe is CVE-2023-53957?: CVE-2023-53957 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-2023-53957 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (39th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2023-53957?: CVE-2023-53957 affects Kimai. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2023-53957?: 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.
Does CVE-2023-53957 have an EU (EUVD) identifier?: Yes. CVE-2023-53957 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-204601.
When was CVE-2023-53957 published?: CVE-2023-53957 was published on 2025-12-19 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:kimai:kimai:1.30.10:*:*:*:*:*:*:*

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Other CWE-1275 vulnerabilities

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CVE-2024-42212 — Medium (CVSS 5.4): HCL BigFix Compliance is affected by an improper or missing SameSite attribute. This can lead to Cross-Site Request…
CVE-2025-52628 — Medium (CVSS 4.6): HCL AION is affected by a Cookie with Insecure, Improper, or Missing SameSite vulnerability. This can allow cookies to…
CVE-2026-55688 — Medium (CVSS 4.0): The AsyncHttpClient (AHC) library allows Java applications to easily execute HTTP requests and asynchronously process…

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