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TI-2026-36465 Aliases CVE-2026-49276GHSA-rhj6-r49h-5932

Kirby: Self cross-site scripting (self-XSS) in the writer field

Priority LOW 35CWE-83Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
Active
Attack complexity
High
Attack requirements
None
Impact type
—
Confidentiality · integrity · availability
High · High · None
Fix status
Fixed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA and GitHub.

Summary

Kirby is an open-source content management system. Prior to 4.9.4 and 5.4.4, Kirby sites using the writer field in any blueprint allowed a scripting link to be included as the target of a link or email link in writer mark components, making the target clickable by the user who entered it and enabling self cross-site scripting in the Panel. This issue is fixed in versions 4.9.4 and 5.4.4.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00432 37th percentileScored 2026-11-07
Fix Fixed kirby (getkirby): 4.9.4, 5.4.4getkirby/cms (Packagist): 4.9.4, 5.4.4

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

VendorProductAffected versionsFixed inStatusSource
getkirbykirbybefore 4.9.4; 5.0.0 to before 5.4.44.9.4, 5.4.4Patch availableCNA
—getkirby/cms (Packagist)before 4.9.44.9.4Patch availableGHSA-rhj6-r49h-5932
—getkirby/cms (Packagist)5.0.0-alpha.1 to before 5.4.45.4.4Patch availableGHSA-rhj6-r49h-5932
  • kirby Vendorgetkirby Affected before 4.9.4; 5.0.0 to before 5.4.4 Fixed in 4.9.4, 5.4.4 Patch available CNA
  • getkirby/cms (Packagist) Vendor— Affected before 4.9.4 Fixed in 4.9.4 Patch available GHSA-rhj6-r49h-5932
  • getkirby/cms (Packagist) Vendor— Affected 5.0.0-alpha.1 to before 5.4.4 Fixed in 5.4.4 Patch available GHSA-rhj6-r49h-5932

CPE names Threatist (inferred) · 1

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

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

Remediation

  • Fix · CNA kirby (getkirby) Fixed in 4.9.4, 5.4.4
  • Fix · GHSA-rhj6-r49h-5932 getkirby/cms (Packagist) Fixed in 4.9.4 Advisory →
  • Fix · GHSA-rhj6-r49h-5932 getkirby/cms (Packagist) Fixed in 5.4.4 Advisory →

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-49276
  2. 2026-10-03 Alias added: GHSA-rhj6-r49h-5932

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