TI-2026-32157 Aliases CVE-2026-44177 GHSA-9hx7-c53c-v6x8

Kirby: Pre-authentication path traversal and PHP file inclusion during user lookup

MEDIUM 48CWE-22Published 2026-07-16 · Updated 2026-07-17

Key facts

Attack vector: Network
Privileges required: None
User interaction: None
Attack complexity: Low
Attack requirements: None
Impact type: Code execution
Confidentiality · integrity · availability: High · Low · None
Fix status: Fixed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA and GitHub. Impact type from CWE-98.

Summary

Kirby is an open-source content management system. In versions 5.3.0 and above but prior to 5.4.1, Kirby did not correctly validate the provided user ID, resulting in a path traversal vulnerability. Version 5.3.0 introduced a performance improvement to the Users collection that loaded user objects lazily when first needed. Users were queried by their ID, which was then used to locate the corresponding account directory under site/accounts. This affected the authentication API (accessible to unauthenticated requests), the users API (accessible only to authenticated users), and any other place that uses $users->find() to look up an individual user by a request-provided email or ID. As a result, an attacker could trigger arbitrary PHP file inclusion of files named index.php (for example, the main PHP files of plugins), the impact of which depends on the logic those files contain. It also allowed probing for the existence of arbitrary directories on the server, letting attackers fingerprint the server and site setup, including installed plugins and the content structure. This issue has been fixed in version 5.4.1.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV

EPSS 0.0177 78th percentileScored 2026-11-07

Fix Fixed kirby (getkirby): 5.4.1getkirby/cms (Packagist): 5.4.1

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation: None
Automatable: Yes
Technical impact: Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
getkirby	kirby	5.3.0 to before 5.4.1	5.4.1	Patch available	CNA
—	getkirby/cms (Packagist)	5.3.0 to before 5.4.1	5.4.1	Patch available	GHSA-9hx7-c53c-v6x8

kirby Vendorgetkirby Affected 5.3.0 to before 5.4.1 Fixed in 5.4.1 Patch available CNA
getkirby/cms (Packagist) Vendor— Affected 5.3.0 to before 5.4.1 Fixed in 5.4.1 Patch available GHSA-9hx7-c53c-v6x8

CPE names Threatist (inferred) · 1

Inferred from how NVD named this product before; not given by a source.

CPE	Versions	Role	Vendor
cpe:2.3:a:getkirby:kirby::::::::	—	—	getkirby

cpe:2.3:a:getkirby:kirby:*:*:*:*:*:*:*:* Versions — — ·getkirby

Remediation

Fix · CNA kirby (getkirby) Fixed in 5.4.1
Fix · GHSA-9hx7-c53c-v6x8 getkirby/cms (Packagist) Fixed in 5.4.1 Advisory →

Timeline

2026-10-02 Threatist record created from CVE-2026-44177
2026-10-03 Alias added: GHSA-9hx7-c53c-v6x8

References

Other 3

TI-2024-17440 An arbitrary file upload vulnerability in the Profile Image module of Kirby CMS v4.1.0… CVSS 3.1HIGH 8.8
TI-2024-17439 An HTML injection vulnerability exists in the Edit Content Layout module of Kirby CMS… CVSS 3.1HIGH 7.1
TI-2026-23396 Kirby CMS through 5.1.4 allows an authenticated user with 'Editor' permissions to cause a… CVSS 3.1MEDIUM 6.5
TI-2024-17441 A stored cross-site scripting (XSS) vulnerability in the Edit Content Layout module of… CVSS 3.1MEDIUM 6.1
TI-2018-10413 An issue was discovered in Kirby 2.5.12. CVSS 3.1MEDIUM 5.4
TI-2024-17438 Kirby CMS v4.1.0 was discovered to contain a reflected self-XSS vulnerability via the URL parameter. CVSS 3.1MEDIUM 4.7

See all 61 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences