TI-2026-33130 Aliases CVE-2026-45334 GHSA-39vq-49qm-r2mc

Kirby: Content locks disclose IDs and emails of inaccessible users from `users.access/list` permissions

LOW 24CWE-862Published 2026-07-16 · Updated 2026-07-17

Key facts

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

Attack profile from CVSS 4.0 · CNA. Fix status from CNA and GitHub. Impact type from CWE-862.

Summary

Kirby is an open-source content management system. In versions prior to 4.9.1 and 5.4.1, the content-locking feature returned lock information without checking the requesting user's access permissions. Kirby's Panel includes a content-locking feature that records which user currently has a model open for editing. This lock prevents conflicting edits by multiple users and displays the locking user's identity in the Panel UI so other users know who to contact. Internally, the locking user's email address and identifier are included in every Panel view payload and in error responses returned when a user attempts to edit a model that is currently locked by another user. This allowed a low-privilege authenticated Panel user, whose role was configured with users.access: false or users.list: false, to learn the email address and identifier of any user who currently had a model open for editing in the Panel, including administrators and other higher-privilege users. Content locks are active for a configurable window (10 minutes by default). The email address can allow admin account enumeration, target phishing, and feed credential-stuffing attacks against the Kirby installation or other sites. The internal user ID can be cross-referenced with other endpoints once the requester has obtained a higher privilege through unrelated means. 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 0.00364 30th 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: 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 4.9.1; 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-39vq-49qm-r2mc
—	getkirby/cms (Packagist)	5.0.0 to before 5.4.1	5.4.1	Patch available	GHSA-39vq-49qm-r2mc

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-39vq-49qm-r2mc
getkirby/cms (Packagist) Vendor— Affected 5.0.0 to before 5.4.1 Fixed in 5.4.1 Patch available GHSA-39vq-49qm-r2mc

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-39vq-49qm-r2mc getkirby/cms (Packagist) Fixed in 4.9.1 Advisory →
Fix · GHSA-39vq-49qm-r2mc getkirby/cms (Packagist) Fixed in 5.4.1 Advisory →

Timeline

2026-10-02 Threatist record created from CVE-2026-45334
2026-10-03 Alias added: GHSA-39vq-49qm-r2mc

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