CVE-2026-50188

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.

CVSS 4.0

6.9CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:N/VI:N/VA:N/SC:N/SI:H/SA:N

EPSS

0.4% chance of exploitation in the next 30 days; higher than 38% of CVEs (scores of 2026-10-25)

CWEs

CWE-93, CWE-113

Published

2026-07-09

Modified

2026-10-25

Record from

the NVD, synced 2026-10-25

References

• https://github.com/getkirby/kirby/commit/aa33414e1669e866cdd6f4decfae2a669e8bb828
• https://github.com/getkirby/kirby/commit/fad9cbd22c73ed0fbd3aaf62310a8dcacfc007cd
• https://github.com/getkirby/kirby/releases/tag/4.9.4
• https://github.com/getkirby/kirby/releases/tag/5.4.4
• https://github.com/getkirby/kirby/security/advisories/GHSA-4v4h-m2qq-ppgw

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