CVE-2024-27087: kirby XSS — Fix

Description

Kirby is a content management system. The new link field introduced in Kirby 4 allows several different link types that each validate the entered link to the relevant URL format. It also includes a "Custom" link type for advanced use cases that don't fit any of the pre-defined link formats. As the "Custom" link type is meant to be flexible, it also allows the javascript: URL scheme. In some use cases this can be intended, but it can also be misused by attackers to execute arbitrary JavaScript code when a user or visitor clicks on a link that is generated from the contents of the link field. This vulnerability is patched in 4.1.1.

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CVSS v3.1 Score

4.6

MEDIUM

CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:L/I:L/A:N

Weakness Type (CWE)

CWE-79 Cross-site Scripting (XSS)

Affected Products

Vendor	Product	Versions
getkirby	kirby	4.0.0 — 4.1.1

References

Advisories & Patches

https://github.com/getkirby/kirby/commit/cda3dd9a15228d35e62ff86cfa87a67e7c687437 https://github.com/getkirby/kirby/security/advisories/GHSA-63h4-w25c-3qv4 https://github.com/getkirby/kirby/commit/cda3dd9a15228d35e62ff86cfa87a67e7c687437 https://github.com/getkirby/kirby/security/advisories/GHSA-63h4-w25c-3qv4

Frequently Asked Questions

What is CVE-2024-27087? +

Kirby is a content management system. The new link field introduced in Kirby 4 allows several different link types that each validate the entered link to the relevant URL format. It also includes a "Custom" link type for advanced use cases that don't fit any of the pre-defined link formats. As the "Custom" link type is meant to be flexible, it also allows the javascript: URL scheme. In some use cases this can be intended, but it can also be misused by attackers to execute arbitrary JavaScript code when a user or visitor clicks on a link that is generated from the contents of the link field. This vulnerability is patched in 4.1.1. It has a CVSS v3.1 base score of 4.6 (MEDIUM).

How severe is CVE-2024-27087? +

CVE-2024-27087 has a CVSS v3.1 score of 4.6 out of 10, rated MEDIUM. This is a medium-severity vulnerability that should be remediated as part of regular maintenance.

What products are affected by CVE-2024-27087? +

CVE-2024-27087 affects products from getkirby, specifically: kirby. Check the affected products table above for specific version ranges.

How do I check if I'm vulnerable to CVE-2024-27087? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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