CVE-2026-32870
Kirby is an open-source content management system.
Published Apr 24, 2026 · corrected/updated Jun 17, 2026 · getkirby kirby · evidence confidence medium
Kirby is an open-source content management system. Kirby's method has special handling for blocks. If the input value is already valid , 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 block but also contained other structured data outside of the block. This structured data would then also be allowed to pass through, circumventing the value protection. The method is used in , and in the data handler (e.g. ). 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 passthrough if the entire string is made up of valid blocks and no structured data. This protects all uses of the method against the described vulnerability.
Grounded briefings
Catalog interpretations for three audiences. Each brief cites ingested metadata and the original advisories below. They are not independent research and they do not invent exploit steps.
Executive
CVE-2026-32870 is a medium public vulnerability record for getkirby kirby. It is not currently listed in the CISA Known Exploited catalog. Check the linked vendor or CERT advisories for patch status. This summary is a catalog interpretation of the ingested metadata and cites the original advisories below.
System administrator
Identify whether getkirby kirby is in your estate, then compare installed versions with the affected ranges. Affected packages or ranges on record: getkirby/kirby. Check the linked vendor or CERT advisories for patch status. Prefer the vendor or distribution advisory linked in Sources before changing production systems. This is a catalog interpretation, not a runbook.
Security analyst
Signals on file: CVSS 6.9. It is not currently listed in the CISA Known Exploited catalog. Weakness classes: CWE-91. Sources contributing to this record: cve_org, nvd. Public exploit references, when present, are outbound links only and are not proof of active exploitation. This is a catalog interpretation of stored metadata.
Exploitation and remediation
Exploitation evidence
Not listed as known exploited in CISA KEV. Not in the CISA KEV catalog.
Patch and remediation
No required-action text is stored yet. Use the vendor or CERT links in Sources for patch availability.
Safe detection guidance
Compare installed versions with the affected ranges below and verify the advisory from the original publisher. This site stores metadata and outbound links only; it does not ship exploit code or proof-of-concept payloads.
Code
The project this record applies to. Exploit listings stay in References.
Timeline
Detection, updates, and resolution for this record.
Apr 24, 2026 · NIST NVD
Detected
Kirby is an open-source content management system. Kirby's method has special handling for blocks. If the input value is already valid , 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 block but also contained other structured data outside of the block. This
Jun 17, 2026 · NIST NVD
Updated
Kirby is an open-source content management system. Kirby's method has special handling for blocks. If the input value is already valid , 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 block but also contained other structured data outside of the block. This
Affected
- cpe getkirby/kirbyversion unspecified
Sources
- CVE.orgVulnerability recordCVE-2026-32870
Official CVE identifier
cve.org - NIST NVDVulnerability recordCVE-2026-32870
Kirby is an open-source content management system. Kirby's method has special handling for blocks. If the input value is already valid , it is not escaped a second time but allowed to pass through. However, prior to versions 4.9.0 and 5.4.0,
nvd.nist.gov