CVE-2026-49276

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

HIGH

7.4

CVSS Score

Published: July 9, 2026 at 06:48 PM UTC

Updated: October 25, 2026 at 05:10 PM UTC

1 product affected across 1 vendorKirby

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Severity

HIGH7.4

Exploit prediction

EPSS 0.4%

SSVC

No known exploit

Description

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.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Kirby · Getkirbycomposer

90%

v < 4.9.4>= 5.0.0, < 5.4.4

Affected range stops below 4.9.4, so it looks safe — our inference, not a vendor statement

Affected range stops below 5.4.4, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet, and no fixed version or vendor advisory is recorded against it.

References (3)

x_refsource_CONFIRM

Source: cverecord

https://github.com/getkirby/kirby/security/advisories/GHSA-rhj6-r49h-5932

x_refsource_MISC

Source: cverecord

https://github.com/getkirby/kirby/releases/tag/4.9.4

x_refsource_MISC

Source: cverecord

https://github.com/getkirby/kirby/releases/tag/5.4.4

SSVC — Action Prioritization

SSVCNo known exploitNot automatableTotal impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

7.4HIGHGitHub_M

Vector?

Quick Info

StatusDEFERRED

CWE

CWE-83

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