EUVD-2026-68808
GHSA-67mx-6wf2-92xp
Severity by source
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/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 REST API requires low-privilege panel auth (PR:L); repeated chunk abuse causes high availability impact on upload subsystem with no C or I impact.
Primary rating from Vendor (GitHub_M).
CVSS VectorVendor: GitHub_M
Lifecycle Timeline
6DescriptionCVE.org
Kirby is an open-source content management system. From 5.0.0 until 5.5.2, Kirby's REST API chunk upload handler in src/Api/Upload.php did not run the relevant upload authorization preflight in Kirby\Api\Upload::process() before Kirby\Api\Upload::processChunk() persisted chunk data. An authenticated user with the access.panel permission enabled but with files.create, files.replace, and user/users.update permissions disabled could submit requests with an Upload-Length header and leave unfinished chunks in site/cache/.uploads for 24 hours. Repeating this process could consume attacker-controlled temporary storage, prevent other users from uploading files, or prevent site logic from storing data, although final permission checks still prevented unauthorized files from reaching the content or site/accounts directories. This issue is fixed in version 5.5.2.
Articles & Coverage 1
AnalysisAI
Storage exhaustion via missing authorization preflight in Kirby CMS 5.0.0-5.5.1 allows authenticated panel users with restricted file permissions to indefinitely fill temporary upload storage. Kirby's REST API chunk upload handler in src/Api/Upload.php persisted chunk data to site/cache/.uploads before running permission checks, enabling users who lack files.create, files.replace, or users.update permissions to repeatedly submit Upload-Length headers and accumulate orphaned chunks retained for 24 hours. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires an authenticated session with the access.panel permission granted. … 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:L/UI:N/VC:N/VI:N/VA:H) accurately characterizes this as a network-reachable, low-complexity availability attack requiring only panel-level authentication with no user interaction. … 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 5.5.2, the confirmed patched release documented at https://github.com/getkirby/kirby/releases/tag/5.5.2 and https://github.com/getkirby/kirby/security/advisories/GHSA-67mx-6wf2-92xp. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours: Inventory all Kirby CMS installations and identify those running versions 5.0.0-5.5.1; audit panel user access and restrict to trusted administrators only if high-risk environment. …
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External POC / Exploit Code
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