TI-2026-32155 Aliases CVE-2026-44175 GHSA-5fhx-9q32-q257

Kirby: Cross-site scripting (XSS) from list field content in the site frontend

LOW 39CWE-79Published 2026-07-16 · Updated 2026-07-17

Key facts

Attack vector: Network
Privileges required: Low
User interaction: Passive
Attack complexity: Low
Attack requirements: None
Impact type: Cross-site scripting
Confidentiality · integrity · availability: High · High · None
Fix status: Fixed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA and GitHub. Impact type from CWE-79.

Summary

Kirby is an open-source content management system. In versions prior to 4.9.1 and 5.4.1, Kirby did not securely sanitize the contents of the list field on save, leaving it vulnerable to cross-site scripting (XSS). Kirby's list field stores its formatted content as HTML, and unlike other field types, its HTML special characters cannot be escaped without losing the formatting. Sanitization was only enforced client-side in the Panel, while the server did not sanitize the content on save. As a result, an attacker could bypass the Panel and send malicious HTML directly to Kirby's API, storing unsanitized markup in the content file. That markup would then be rendered on the site frontend and executed in the browsers of site visitors and logged-in users browsing the site, resulting in persistent XSS. This issue has been fixed in versions 4.9.1 and 5.4.1.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV

EPSS 0.0043 37th percentileScored 2026-11-07

Fix Fixed kirby (getkirby): 4.9.1, 5.4.1getkirby/cms (Packagist): 4.9.1, 5.4.1

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation: None
Automatable: No
Technical impact: Total

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	before 4.9.1; 5.0.0 to before 5.4.1	4.9.1, 5.4.1	Patch available	CNA
—	getkirby/cms (Packagist)	before 4.9.1	4.9.1	Patch available	GHSA-5fhx-9q32-q257
—	getkirby/cms (Packagist)	5.0.0 to before 5.4.1	5.4.1	Patch available	GHSA-5fhx-9q32-q257

kirby Vendorgetkirby Affected before 4.9.1; 5.0.0 to before 5.4.1 Fixed in 4.9.1, 5.4.1 Patch available CNA
getkirby/cms (Packagist) Vendor— Affected before 4.9.1 Fixed in 4.9.1 Patch available GHSA-5fhx-9q32-q257
getkirby/cms (Packagist) Vendor— Affected 5.0.0 to before 5.4.1 Fixed in 5.4.1 Patch available GHSA-5fhx-9q32-q257

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 4.9.1, 5.4.1
Fix · GHSA-5fhx-9q32-q257 getkirby/cms (Packagist) Fixed in 4.9.1 Advisory →
Fix · GHSA-5fhx-9q32-q257 getkirby/cms (Packagist) Fixed in 5.4.1 Advisory →

Timeline

2026-10-02 Threatist record created from CVE-2026-44175
2026-10-03 Alias added: GHSA-5fhx-9q32-q257

References

Other 4

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