GHSA-x275-h9j4-7p4h · Severity: medium · Ecosystem: composer — Kirby vulnerable to path traversal of collection names during file system lookup
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 outside of the collections root will not be loaded.
Conclusion & alert: CVE-2025-31493 is rated Moderate Risk (51.4/100): CVSS Medium severity, with medium exploitation likelihood (EPSS 0.77%). Mandatory action: Review affected assets and schedule remediation.
Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.
EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).
| # | Date | Old EPSS score | New EPSS score | Delta (New - Old) |
|---|---|---|---|---|
| 1 | 2026-03-09 | 0.18% | 0.77% | +0.59% |
| 2 | 2026-01-27 | 0.06% | 0.18% | +0.11% |
| 3 | 2025-05-14 | — | 0.06% | — |
Full EPSS history (3 records total)
CVSS metrics for this CVE.
| Base score | Version | Severity | Vector | Exploitability | Impact | Score source |
|---|---|---|---|---|---|---|
| 6.3 | 4.0 | MEDIUM |
|
— | — | [email protected] |
| 9.1 | 3.1 | CRITICAL |
|
3.9 | 5.2 | [email protected] |
GHSA-x275-h9j4-7p4h · Severity: medium · Ecosystem: composer — Kirby vulnerable to path traversal of collection names during file system lookup
| URL | Tags |
|---|---|
| https://github.com/getkirby/kirby/releases/tag/3.10.1.2 | Release Notes |
| https://github.com/getkirby/kirby/releases/tag/3.9.8.3 | Release Notes |
| https://github.com/getkirby/kirby/releases/tag/4.7.1 | Release Notes |
| https://github.com/getkirby/kirby/security/advisories/GHSA-x275-h9j4-7p4h | Vendor Advisory |