Severity by source
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/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
Network-reachable, no auth required against default config; impact is path disclosure only, so C:L with no I or A impact and unchanged scope.
Primary rating from Vendor (GitHub_M).
CVSS VectorVendor: GitHub_M
Lifecycle Timeline
3DescriptionCVE.org
Kirby is an open-source content management system. Prior to 4.9.5 and from 5.0.0 through 5.5.1, the REST API error handler can return unsanitized PHP error messages that expose the full filesystem path of the Kirby installation to unauthenticated API users. This vulnerability affects all Kirby sites that have not disabled the REST API with the 'api' => false option. This issue is fixed in versions 4.9.5 and 5.5.2.
AnalysisAI
Kirby CMS's REST API error handler exposes full server filesystem paths to unauthenticated remote users via unsanitized PHP exception messages. Affected are all Kirby installations on versions prior to 4.9.5 (4.x branch) and 5.0.0 through 5.5.1 (5.x branch) where the REST API has not been explicitly disabled. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires that the Kirby REST API is active, which is the default configuration - sites that have explicitly added 'api' => false to their Kirby config are not affected. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 4.0 vector (AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N) confirms unauthenticated, network-accessible exploitation with no attack complexity or user interaction required, reflecting the default-enabled state of the Kirby REST API. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | Full exploit scenario with step-by-step reproduction available after sign-in. |
| Remediation | Upgrade to Kirby 4.9.5 (4.x branch) or Kirby 5.5.2 (5.x branch), both confirmed as fixed versions by the vendor advisory at https://github.com/getkirby/kirby/security/advisories/GHSA-rf2p-vh74-7vvh and by the fix commits at https://github.com/getkirby/kirby/commit/58f819988436b31969078bc4655452dd48546451. … Detailed patch versions, workarounds, and compensating controls in full report. |
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External POC / Exploit Code
Leaving vuln.today
EUVD-2026-54577
GHSA-rf2p-vh74-7vvh