CVE-2026-50188: CWE-93: Improper Neutralization of CRLF Sequences ('CRLF Injection') in getkirby kirby
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.
AI Analysis
Technical Summary
CVE-2026-50188 is a CRLF injection vulnerability (CWE-93) affecting the Kirby CMS Http Remote class methods Remote::request(), Remote::get(), and Remote::post(). When these methods send HTTP requests with untrusted data in the headers option, newline characters in header values can inject additional unintended HTTP headers to the remote service. This vulnerability exists in Kirby versions prior to 4.9.4 and 5.4.4 and has a CVSS 4.0 base score of 6.9, indicating medium severity. The vulnerability is resolved in Kirby versions 4.9.4 and 5.4.4.
Potential Impact
An attacker able to control header values in outgoing HTTP requests can inject additional headers, potentially manipulating the behavior of the remote service receiving the request. This may lead to unintended request handling or security bypasses on the remote side. The vulnerability does not require privileges or user interaction and can be exploited remotely.
Mitigation Recommendations
Upgrade Kirby CMS to version 4.9.4 or later, or 5.4.4 or later, where this vulnerability is fixed. No other mitigation or temporary workaround is documented. Patch status is confirmed fixed in these versions.
CVE-2026-50188: CWE-93: Improper Neutralization of CRLF Sequences ('CRLF Injection') in getkirby kirby
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.
CVSS v4.0
Score 6.9medium
Affected software
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AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
CVE-2026-50188 is a CRLF injection vulnerability (CWE-93) affecting the Kirby CMS Http Remote class methods Remote::request(), Remote::get(), and Remote::post(). When these methods send HTTP requests with untrusted data in the headers option, newline characters in header values can inject additional unintended HTTP headers to the remote service. This vulnerability exists in Kirby versions prior to 4.9.4 and 5.4.4 and has a CVSS 4.0 base score of 6.9, indicating medium severity. The vulnerability is resolved in Kirby versions 4.9.4 and 5.4.4.
Potential Impact
An attacker able to control header values in outgoing HTTP requests can inject additional headers, potentially manipulating the behavior of the remote service receiving the request. This may lead to unintended request handling or security bypasses on the remote side. The vulnerability does not require privileges or user interaction and can be exploited remotely.
Mitigation Recommendations
Upgrade Kirby CMS to version 4.9.4 or later, or 5.4.4 or later, where this vulnerability is fixed. No other mitigation or temporary workaround is documented. Patch status is confirmed fixed in these versions.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- GitHub_M
- Date Reserved
- 2026-06-03T22:05:13.645Z
- Cvss Version
- 4.0
- State
- PUBLISHED
- Remediation Level
- null
Threat ID: 6a4ff3f768715ace43ecf63d
Added to database: 07/09/2026, 19:18:15 UTC
Last enriched: 07/09/2026, 19:33:15 UTC
Last updated: 07/09/2026, 23:39:42 UTC
Views: 8
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