getkirby up to 4.8.x/5.3.x Xml::value xml injection

Summaryinfo

A vulnerability, which was classified as critical, was found in getkirby kirby up to 4.8.x/5.3.x. Affected is the function Xml::value. Such manipulation leads to xml injection. This vulnerability is referenced as CVE-2026-32870. It is possible to launch the attack remotely. No exploit is available. You should upgrade the affected component.

Detailsinfo

A vulnerability was found in getkirby kirby up to 4.8.x/5.3.x. It has been rated as critical. Affected by this issue is the function Xml::value. The manipulation with an unknown input leads to a xml injection vulnerability. Using CWE to declare the problem leads to CWE-91. The product does not properly neutralize special elements that are used in XML, allowing attackers to modify the syntax, content, or commands of the XML before it is processed by an end system. Impacted is confidentiality, integrity, and availability. CVE summarizes:

Kirby is an open-source content management system. Kirby's `Xml::value()` method has special handling for `` blocks. If the input value is already valid `CDATA`, it is not escaped a second time but allowed to pass through. However, prior to versions 4.9.0 and 5.4.0, it was possible to trick this check into allowing values that only contained a valid `CDATA` block but also contained other structured data outside of the `CDATA` block. This structured data would then also be allowed to pass through, circumventing the value protection. The `Xml::value()` method is used in `Xml::tag()`, `Xml::create()` and in the `Xml` data handler (e.g. `Data::encode($string, 'xml')`). Both the vulnerable methods and the data handler are not used in the Kirby core. However they may be used in site or plugin code, e.g. to create XML strings from input data. If those generated files are passed to another implementation that assigns specific meaning to the XML schema, manipulation of this system's behavior is possible. Kirby sites that don't use XML generation in site or plugin code are not affected. The problem has been patched in Kirby 4.9.0 and Kirby 5.4.0. In all of the mentioned releases, Kirby has added additional checks that only allow unchanged `CDATA` passthrough if the entire string is made up of valid `CDATA` blocks and no structured data. This protects all uses of the method against the described vulnerability.

The advisory is available at github.com. This vulnerability is handled as CVE-2026-32870 since 03/16/2026. The exploitation is known to be easy. The attack may be launched remotely. No form of authentication is required for exploitation. Technical details are known, but there is no available exploit. This vulnerability is assigned to T1505 by the MITRE ATT&CK project.

Upgrading to version 4.9.0 or 5.4.0 eliminates this vulnerability. The upgrade is hosted for download at github.com.

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Productinfo

Vendor

• getkirby

Name

• kirby

Version

• 4.0
• 4.1
• 4.2
• 4.3
• 4.4
• 4.5
• 4.6
• 4.7
• 4.8
• 5.0
• 5.1
• 5.2
• 5.3

Website

• Product: https://github.com/getkirby/kirby/

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