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© 2026 FAUCET Technologies LLC. All rights reserved.

CVE-2026-50188

30
FAUCET Score

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.

First published: Jul 9, 2026Last modified: Jul 9, 2026

Impacted Technologies

VendorProductVersion(s)CPE
GetkirbyKirby
< 4.9.4, >= 5.0.0, < 5.4.4CNA affected

CVSS Data

CVSS version used by this source: 4.0

6.9MEDIUM

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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

Attack Vector
NETWORK
Attack Complexity
HIGH
Attack Requirements
NONE
Privileges Required
NONE
User Interaction
NONE
VS Confidentiality
NONE
VS Integrity
NONE
VS Availability
NONE
SS Confidentiality
NONE
SS Integrity
HIGH
SS Availability
NONE
Exploit Maturity
NOT_DEFINED
CvssVersion
4.0

Exploit Intelligence

EPSS Score
0.29%
Probability of exploitation in next 30 days
EPSS Percentile
21.2%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0029 is in the 3rd percentile among its peer group of 19,958 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.0 Bluesky, 0.0 Mastodon, and 0.2 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.0 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (2)

composerpatch availablevia ghsa
Product: getkirby/cmsFixed in: 4.9.4
composerpatch availablevia ghsa
Product: getkirby/cmsFixed in: 5.4.4

Vendor Advisories (1)

composerGHSA-4v4h-m2qq-ppgwmedium

Kirby: Request header injection in `Http\Remote`

Jun 18, 2026

References

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