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.
References (5)
Core 5
Core References
X_Refsource_Confirm x_refsource_confirm
https://github.com/getkirby/kirby/security/advisories/GHSA-4v4h-m2qq-ppgw
X_Refsource_Misc x_refsource_misc
https://github.com/getkirby/kirby/commit/aa33414e1669e866cdd6f4decfae2a669e8bb828
X_Refsource_Misc x_refsource_misc
https://github.com/getkirby/kirby/commit/fad9cbd22c73ed0fbd3aaf62310a8dcacfc007cd
X_Refsource_Misc x_refsource_misc
https://github.com/getkirby/kirby/releases/tag/4.9.4
X_Refsource_Misc x_refsource_misc
https://github.com/getkirby/kirby/releases/tag/5.4.4
Scores
CVSS v4
6.9
EPSS
0.0029
EPSS Percentile
21.3%
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
CISA SSVC
Vulnrichment
Exploitation
none
Automatable
no
Technical Impact
partial
Details
CWE
CWE-113
CWE-93
Status
published
Products (2)
getkirby/kirby
< 4.9.4
getkirby/kirby
>= 5.0.0, < 5.4.4
Published
Jul 09, 2026
Tracked Since
Jul 10, 2026