Kirby: Request header injection in `Http\Remote`
Priority LOW 31CWE-113Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- High
- Attack requirements
- None
- Impact type
- —
- Confidentiality · integrity · availability
- None · None · None
- Fix status
- Fixed
Attack profile from CVSS 4.0 · CNA. Fix status from CNA and GitHub.
Summary
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.
Why it matters now
Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00443 38th percentileScored 2026-11-07
Fix Fixed kirby (getkirby): 4.9.4, 5.4.4getkirby/cms (Packagist): 4.9.4, 5.4.4
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- None
- Automatable
- No
- Technical impact
- Partial
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| getkirby | kirby | before 4.9.4; 5.0.0 to before 5.4.4 | 4.9.4, 5.4.4 | Patch available | CNA |
| — | getkirby/cms (Packagist) | before 4.9.4 | 4.9.4 | Patch available | GHSA-4v4h-m2qq-ppgw |
| — | getkirby/cms (Packagist) | 5.0.0-alpha.1 to before 5.4.4 | 5.4.4 | Patch available | GHSA-4v4h-m2qq-ppgw |
- kirby Vendorgetkirby Affected before 4.9.4; 5.0.0 to before 5.4.4 Fixed in 4.9.4, 5.4.4 Patch available CNA
- getkirby/cms (Packagist) Vendor— Affected before 4.9.4 Fixed in 4.9.4 Patch available GHSA-4v4h-m2qq-ppgw
- getkirby/cms (Packagist) Vendor— Affected 5.0.0-alpha.1 to before 5.4.4 Fixed in 5.4.4 Patch available GHSA-4v4h-m2qq-ppgw
Remediation
- Fix · CNA kirby (getkirby) Fixed in 4.9.4, 5.4.4
- Fix · GHSA-4v4h-m2qq-ppgw getkirby/cms (Packagist) Fixed in 4.9.4 Advisory →
- Fix · GHSA-4v4h-m2qq-ppgw getkirby/cms (Packagist) Fixed in 5.4.4 Advisory →
Timeline
- 2026-10-02 Threatist record created from CVE-2026-50188
- 2026-10-03 Alias added: GHSA-4v4h-m2qq-ppgw
References
Other 6
- https://github.com/getkirby/kirby/security/advisories/GHSA-4v4h-m2qq-ppgw
- 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
More getkirby vulnerabilities
- TI-2024-17440 An arbitrary file upload vulnerability in the Profile Image module of Kirby CMS v4.1.0… CVSS 3.1HIGH 8.8
- TI-2024-17439 An HTML injection vulnerability exists in the Edit Content Layout module of Kirby CMS… CVSS 3.1HIGH 7.1
- TI-2026-23396 Kirby CMS through 5.1.4 allows an authenticated user with 'Editor' permissions to cause a… CVSS 3.1MEDIUM 6.5
- TI-2024-17441 A stored cross-site scripting (XSS) vulnerability in the Edit Content Layout module of… CVSS 3.1MEDIUM 6.1
- TI-2018-10413 An issue was discovered in Kirby 2.5.12. CVSS 3.1MEDIUM 5.4
- TI-2024-17438 Kirby CMS v4.1.0 was discovered to contain a reflected self-XSS vulnerability via the URL parameter. CVSS 3.1MEDIUM 4.7
Sources
- CVE-2026-50188 · CVE Program
- CVE-2026-50188 · NVD
- FIRST EPSS
- GHSA-4v4h-m2qq-ppgw · GitHub Advisory Database · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences