CVE-2025-31493: Path traversal of collection names during file system lookup
Description
Kirby is an open-source content management system. A vulnerability in versions prior to 3.9.8.3, 3.10.1.2, and 4.7.1 affects all Kirby sites that use the `collection()` helper or `$kirby->collection()` method with a dynamic collection name (such as a collection name that depends on request or user data). Sites that only use fixed calls to the `collection()` helper/`$kirby->collection()` method (i.e. calls with a simple string for the collection name) are *not* affected. A missing path traversal check allowed attackers to navigate and access all files on the server that were accessible to the PHP process, including files outside of the collections root or even outside of the Kirby installation. PHP code within such files was executed. Such attacks first require an attack vector in the site code that is caused by dynamic collection names, such as `collection('tags-' . get('tags'))`. It generally also requires knowledge of the site structure and the server's file system by the attacker, although it can be possible to find vulnerable setups through automated methods such as fuzzing. In a vulnerable setup, this could cause damage to the confidentiality and integrity of the server. The problem has been patched in Kirby 3.9.8.3, Kirby 3.10.1.2, and Kirby 4.7.1. In all of the mentioned releases, the maintainers of Kirby have added a check for the collection path that ensures that the resulting path is contained within the configured collections root. Collection paths that point ou...
Classification
CVE ID: CVE-2025-31493
CVSS Base Severity: MEDIUM
CVSS Base Score: 6.3
CVSS Vector: CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:L/VA:N/SC:L/SI:L/SA:N
Problem Types
CWE-22: Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal') CWE-23: Relative Path TraversalAffected Products
Vendor: getkirby
Product: kirby
Exploit Prediction Scoring System (EPSS)
EPSS Score: 0.08% (probability of being exploited)
EPSS Percentile: 25.3% (scored less or equal to compared to others)
EPSS Date: 2025-06-11 (when was this score calculated)
References
https://nvd.nist.gov/vuln/detail/CVE-2025-31493https://github.com/getkirby/kirby/security/advisories/GHSA-x275-h9j4-7p4h
https://github.com/getkirby/kirby/releases/tag/3.10.1.2
https://github.com/getkirby/kirby/releases/tag/3.9.8.3
https://github.com/getkirby/kirby/releases/tag/4.7.1