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GHSA-cw7v-45wm-mcf2
No affected components available
Duplicate Advisory
This advisory has been withdrawn because it is been determined to not be a vulnerability. This link is maintained to preserve external references.
Original Description
Summary
Kirby CMS through version 5.1.4 allows an authenticated user with Editor permissions to cause a persistent Denial of Service (DoS) via a malformed image upload.
Details
The vulnerability is caused by improper validation of the return value of PHP's getimagesize() function. When a malformed file is uploaded with a valid image extension (e.g., .jpg), the function returns false instead of an expected array.
The application fails to handle this condition properly and proceeds with image processing, resulting in a fatal TypeError. This leads to persistent application crashes when the affected file is accessed.
Impact
- Persistent Denial of Service (DoS)
- Affected pages return HTTP 500 errors
- Requires manual removal of the malformed file to restore functionality
- Exploitable by authenticated users with Editor permissions
Identifiers
- CVE-2026-29905
Resources
- https://github.com/github/advisory-database/pull/7503
- https://github.com/Stalin-143/CVE-2026-29905
- https://github.com/getkirby/kirby/releases/tag/5.2.0-rc.1
- https://www.cve.org/CVERecord?id=CVE-2026-29905
The vulnerability can be exploited over the network without needing physical access. It is easy for an attacker to exploit this vulnerability. An attacker needs basic access or low-level privileges. No user interaction is needed for the attacker to exploit this vulnerability. The impact is confined to the system where the vulnerability exists. There is a high impact on the availability of the system.
Exploitation attempts have been detected. Elevated vigilance and prompt remediation are advised.
The exploit probability is very low. The vulnerability is unlikely to be exploited in the next 30 days.
We did not find any exploit available. Neither in GitHub repositories nor in the Exploit-Database.
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