Kirby: Request header injection in `Http\Remote` (CVE-2026-50188) | HOL Guard CVE

Medium · CVSS 6.9CVE-2026-50188GHSA-4V4H-M2QQ-PPGW

Kirby: Request header injection in `Http\Remote`

Answer in brief

CVE-2026-50188 records a Medium severity (CVSS 6.9) vulnerability in Kirby: Request header injection in `Http\Remote`. The current sources do not mark it as known exploited. The current feed maps getkirby/cms (composer), getkirby/cms (composer), getkirby/kirby (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Jul 9, 2026Updated Jul 10, 2026Source checked Sep 17, 2026First seen by HOL Jun 19, 2026Material review Jul 10, 2026

Upstream Advisory

Key facts

Risk: Medium · CVSS 6.9
Exploitation: Not marked as known exploited
Affected software: 3 mapped packages or products
Fix availability: Available

Why this deserves its current priority

CVSS is 6.9. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps getkirby/cms (composer), getkirby/cms (composer), getkirby/kirby (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
Package	Affected range	Fixed version
getkirby/cmscomposer	<=4.9.3	4.9.4
getkirby/cmscomposer	>=5.0.0-alpha.1,<=5.4.3	5.4.4
getkirby/kirbygeneric	< 4.9.4 \|\| >= 5.0.0, < 5.4.4	Not reported

Recommended response

Check inventory. Check lockfiles and deployed manifests for getkirby/cms, getkirby/cms, getkirby/kirby.
Review the reported fix. Update getkirby/cms to 4.9.4; getkirby/cms to 5.4.4 if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

Published upstream
Jul 9, 2026
Evidence: source:cvelist:source_dates:source-dates:record
Source modified
Jul 10, 2026
Evidence: source:cvelist:source_dates:source-dates:record
First seen by HOL
Jun 19, 2026

Sources and claim methodology

Upstream source 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.

Quoted source text, attributed separately from HOL analysis.