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CVE-2026-34587— Kirby has Server-Side Template Injection (SSTI) via double template resolution in option rendering

Quick assessment

Affected
getkirby kirby
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Kirby是Kirby开源的一套基于文件的内容管理系统（CMS）。 Kirby 4.9.0之前版本和5.4.0之前版本存在安全漏洞，该漏洞源于changeStatus权限在页面创建时未生效，可能导致具有pages.create权限的经过身份验证的攻击者通过REST API覆盖isDraft标志，立即创建已发布页面。

AI Predicted 7.5 Difficulty: Easy EPSS 0.48% · P39

Possible ATT&CK Techniques 1 AI

T1068 · Exploitation for Privilege Escalation
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I. Basic Information for CVE-2026-34587

Vulnerability Information
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Vulnerability Title
Kirby has Server-Side Template Injection (SSTI) via double template resolution in option rendering
Source: CVE Program / CVE List V5
Vulnerability Description
Kirby is an open-source content management system. Prior to versions 4.9.0 and 5.4.0, Kirby's user permissions control which user role is allowed to perform specific actions to content models in the CMS. These permissions are defined for each role in the user blueprint (`site/blueprints/users/...`). It is also possible to customize the permissions for each target model in the model blueprints (such as in `site/blueprints/pages/...`) using the `options` feature. The permissions and options together control the authorization of user actions. For pages, Kirby provides the `pages.create` and `pages.changeStatus` permissions (among others). In affected releases, Kirby checked these permissions independently and only for the respective action. However the `changeStatus` permission didn't take effect on page creation. New pages are created as drafts by default and need to be published by changing the page status of an existing page draft. This is ensured when the page is created via the Kirby Panel. However the REST API allows to override the `isDraft` flag when creating a new page. This allowed authenticated attackers with the `pages.create` permission to immediately create published pages, bypassing the normal editorial workflow. The problem has been patched in Kirby 4.9.0 and Kirby 5.4.0. Kirby has updated the `Options` logic to no longer double-resolve queries in option values coming from `OptionsQuery` or `OptionsApi` sources. Kirby now only resolves queries that are directly configured in the blueprints.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
CWE-1336
Source: CVE Program / CVE List V5
Vulnerability Title
Kirby 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Kirby是Kirby开源的一套基于文件的内容管理系统（CMS）。 Kirby 4.9.0之前版本和5.4.0之前版本存在安全漏洞，该漏洞源于changeStatus权限在页面创建时未生效，可能导致具有pages.create权限的经过身份验证的攻击者通过REST API覆盖isDraft标志，立即创建已发布页面。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
getkirby kirby < 4.9.0 -

II. Public POCs for CVE-2026-34587

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III. Intelligence Information for CVE-2026-34587

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Vendor Advisories for CVE-2026-34587 (1)

Vendor Pages for CVE-2026-34587 (1)

Same Patch Batch · getkirby · 2026-04-24 · 4 CVEs total

CVE-2026-41325 Kirby is vulnerable to authorization bypass during page, file and user creation via bluepr
CVE-2026-32870 Kirby has XML injection in its XML creator toolkit
CVE-2026-40099 Kirby's page creation API bypasses the changeStatus permission check via unfiltered isDraf

IV. Related Vulnerabilities

Same product: kirby
Same vendor: getkirby
Same weakness: CWE-1336

V. Comments for CVE-2026-34587

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