# Kimai contains a SameSite cookie vulnerability

Advisory record · `GHSA-cv8h-r7r5-vwj9`

- **Identifiers:** `GHSA-cv8h-r7r5-vwj9` · `CVE-2023-53957` · `PKSA-kh61-fncz-s7b4`
- **State:** Confirmed
- **Severity:** CVSS 8.5 High
- **Critical:** No
- **Weakness (CWE):** [CWE-1275](https://cwe.mitre.org/data/definitions/1275.html)
- **Tags:** [CWE-1275](https://agentprime.io/advisories/tag/cwe-1275.md)
- **Published:** 19 Dec 2025
- **Updated:** 20 Feb 2026
- **Reviewed by a person:** No

Published by the GitHub Advisory Database at 19 Dec 2025, 21:30 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

## Affected packages

- `kimai/kimai` (Packagist): affected `<=1.30.10`; no fixed version yet

## Machine-written summary

Summary written by Claude Haiku from the source advisory. Not reviewed by a person.

> Kimai versions up to and including 1.30.10 contain a SameSite cookie vulnerability. The source gives few details, but it says an attacker who tricks a victim into running a crafted PHP script could capture session cookies and write them to a file, enabling session hijacking. No fixed version is listed.

Written 3 Nov 2026.

## Not analysed yet

We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.

## Severity and exploitation

- 8.5 High, CVSS 4.0: `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`, from CNA (VulnCheck)

- **CISA KEV:** Not listed.
- **EPSS:** 0.0059, the 48th percentile, on 5 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

## Timeline

- 31 Oct 2026, 14:26 UTC: First seen by agentprime
- 31 Oct 2026, 14:26 UTC: [Confirmed by OSV](https://osv.dev/vulnerability/GHSA-cv8h-r7r5-vwj9)

## Sources

- [GitHub Advisory Database: GHSA-cv8h-r7r5-vwj9](https://github.com/advisories/GHSA-cv8h-r7r5-vwj9)
- [OSV: GHSA-cv8h-r7r5-vwj9](https://osv.dev/vulnerability/GHSA-cv8h-r7r5-vwj9)
- <https://nvd.nist.gov/vuln/detail/CVE-2023-53957>
- <https://github.com/kimai/kimai>
- <https://www.exploit-db.com/exploits/51278>
- <https://www.vulncheck.com/advisories/kimai-samesite-cookie-vulnerability-session-hijacking>

Facts on this page come from the GitHub Advisory Database (CC-BY 4.0), OSV and the other sources listed, as published. We don’t reproduce full advisory descriptions, which can contain exploit code.

## Check whether this affects you

A Match means an installed version is in the affected range above. Most don’t affect the app; agentprime hasn’t analysed this one yet.

- With the agentprime MCP server (<https://api.agentprime.io/mcp>), ask your agent to check the project: `check_lockfile` sends a lockfile, `check_packages` a list of installed packages, and both return the Matches and the upgrades that clear them. `get_advisory` returns this record. Setup: <https://agentprime.io/mcp.md>
- In a browser: <https://agentprime.io/check/> reads your lockfile in the browser, never uploading it.
- Whether it touches your code, with file and line: the Claude Code plugin, <https://agentprime.io/plugin.md>
- As JSON: <https://api.agentprime.io/v1/advisories/GHSA-cv8h-r7r5-vwj9>, or `POST https://api.agentprime.io/v1/match` with your packages (<https://agentprime.io/api.md>)

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The web page: <https://agentprime.io/advisories/GHSA-cv8h-r7r5-vwj9/>. Everything for agents: <https://agentprime.io/llms.txt>.