TI-2026-52904 Aliases CVE-2026-75594 GHSA-9vx2-j98c-p72w

Path traversal in getkirby kirby

LOW 37CWE-22Published 2026-08-31 · Updated 2026-09-01

Key facts

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

Attack profile from CVSS 4.0 · CNA. Fix status from CNA and GitHub. Impact type from CWE-22 and the CVSS impact.

Summary

Kirby is an open-source content management system. Prior to 4.9.5 and 5.5.2, depending on the release line, Kirby's media handler in src/Cms/Media.php allowed Kirby\Cms\Media::thumb() to append a path-bearing filename to a validated parent media directory. On nginx, PHP's built-in server, or Apache with AllowEncodedSlashes enabled, a remote attacker could submit encoded slash characters such as %2f in the filename and traverse outside the parent's media directory. Differences between responses for existing and nonexistent thumbnail configurations disclosed whether an arbitrary .json file existed, and a .json file containing a valid filename key could cause the referenced image to be returned and the job file to be deleted. The related file::version path in src/Filesystem/Asset.php also accepted ../ sequences outside the intended index root. This issue is fixed in versions 4.9.5 and 5.5.2.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV

EPSS 0.00762 55th percentileScored 2026-11-07

Fix Fixed kirby (getkirby): 4.9.5, 5.5.2getkirby/cms (Packagist): 4.9.5, 5.5.2

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation: None
Automatable: No
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	before 4.9.5; 5.0.0 to before 5.5.2	4.9.5, 5.5.2	Patch available	CNA
—	getkirby/cms (Packagist)	before 4.9.5	4.9.5	Patch available	GHSA-9vx2-j98c-p72w
—	getkirby/cms (Packagist)	5.0.0 to before 5.5.2	5.5.2	Patch available	GHSA-9vx2-j98c-p72w

kirby Vendorgetkirby Affected before 4.9.5; 5.0.0 to before 5.5.2 Fixed in 4.9.5, 5.5.2 Patch available CNA
getkirby/cms (Packagist) Vendor— Affected before 4.9.5 Fixed in 4.9.5 Patch available GHSA-9vx2-j98c-p72w
getkirby/cms (Packagist) Vendor— Affected 5.0.0 to before 5.5.2 Fixed in 5.5.2 Patch available GHSA-9vx2-j98c-p72w

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 4.9.5, 5.5.2
Fix · GHSA-9vx2-j98c-p72w getkirby/cms (Packagist) Fixed in 4.9.5 Advisory →
Fix · GHSA-9vx2-j98c-p72w getkirby/cms (Packagist) Fixed in 5.5.2 Advisory →

Timeline

2026-10-02 Threatist record created from CVE-2026-75594
2026-10-03 Alias added: GHSA-9vx2-j98c-p72w

References

Advisory 1

https://nvd.nist.gov/vuln/detail/CVE-2026-75594

Other 8

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