CVE-2023-53957: Kimai contains a SameSite cookie vulnerability

CVE-2023-53957 · Severity: critical · CVSS 9.8 · Published 2025-12-19

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.

Technologies: Kimai, kimai/kimai (Packagist). Vendors: Kimai, Packagist.

Quick answers

Is CVE-2023-53957 exploited in the wild?
No. Junglewise Threat Intelligence has no report of CVE-2023-53957 being exploited in the wild.
How severe is CVE-2023-53957?
Critical severity, with a CVSS score of 9.8, published 19 December 2025.
Which products and versions are affected?
kimai/kimai (Packagist) ECOSYSTEM:introduced=0,last_affected=1.30.10.
Is there a fix for CVE-2023-53957?
No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.
Am I affected by CVE-2023-53957?
Check whether you run Kimai or kimai/kimai (Packagist) at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

Affected products

  • Kimai
  • kimai/kimai (Packagist) ECOSYSTEM:introduced=0,last_affected=1.30.10

Identifiers

  • CVE-2023-53957
  • GHSA-cv8h-r7r5-vwj9

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