# CVE-2026-50188

## Summary

- **CVE ID:** CVE-2026-50188
- **Severity:** MEDIUM
- **CVSS Score:** 6.9 (CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:N/VI:N/VA:N/SC:N/SI:H/SA:N)
- **CWE:** CWE-93, CWE-113
- **Published:** Jul 9, 2026
- **Last Modified:** Jul 10, 2026

## Description

Kirby is an open-source content management system. Prior to 4.9.4 and 5.4.4, Kirby sites and plugins using the Kirby Http Remote class, including Remote::request(), Remote::get(), and Remote::post(), to send outgoing HTTP requests with untrusted data in the headers option could allow newline characters in a header value to inject a separate unintended request header to the remote service. This issue is fixed in versions 4.9.4 and 5.4.4.

## Affected Products

- getkirby — kirby (< 4.9.4)
- getkirby — kirby (>= 5.0.0, < 5.4.4)

## References

- [CNA](https://github.com/getkirby/kirby/security/advisories/GHSA-4v4h-m2qq-ppgw)
- [CNA](https://github.com/getkirby/kirby/commit/aa33414e1669e866cdd6f4decfae2a669e8bb828)
- [CNA](https://github.com/getkirby/kirby/commit/fad9cbd22c73ed0fbd3aaf62310a8dcacfc007cd)
- [CNA](https://github.com/getkirby/kirby/releases/tag/4.9.4)
- [CNA](https://github.com/getkirby/kirby/releases/tag/5.4.4)

## Exploitation Prediction (EPSS)

- **EPSS Score:** 0.44%
- **EPSS Percentile:** 37.4

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_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-11._