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kirby

Kirby CMS through 5.1.4 allows an authenticated user with 'Editor' permissions to cause a persistent Denial of Service (DoS) via a malformed image upload. The application fails to properly validate the return value of the PHP getimagesize() function. When the system attempts to process this file for metadata or thumbnail generation, it triggers a fatal TypeError.

CVE-2026-29905 is a security vulnerability affecting Kirby CMS through version 5.1.4, specifically involving the handling of image uploads by users with Editor permissions. The root cause is improper validation of the return value from the PHP getimagesize() function, which is used to extract image metadata and generate thumbnails. When a malformed image file is uploaded, getimagesize() may return false or an unexpected value, but the application fails to handle this scenario gracefully. Instead, it triggers a fatal TypeError, causing the image processing component to crash. This results in a persistent Denial of Service (DoS) condition, as the system cannot properly process images thereafter. The vulnerability requires an authenticated user with Editor-level permissions, which means it is not exploitable by unauthenticated attackers but can be leveraged by insiders or compromised accounts. No CVSS score has been assigned yet, and no public exploits have been reported. The vulnerability highlights a common issue in input validation and error handling in web applications, particularly in CMS platforms that rely on user-generated content. The persistent DoS can disrupt website functionality, degrade user experience, and potentially impact business operations relying on Kirby CMS for content delivery.

Detailed information about CVE-2026-29905: n/a. Get real-time updates, technical details, and mitigation strategies.

CVE-2026-29905: n/a - Live Threat Intelligence - Threat Radar | OffSeq.com

CVE-2026-29905: n/a

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