vulnerability / NVI-00007496 / Revision 3
Kirby has Server-Side Template Injection (SSTI) via double template resolution in option rendering
OSV carries this publisher advisory for getkirby/cms, getkirby/cms. This is an aggregated source copy; consult the original publisher and compare update dates.
This report has not inspected your inventory, configuration, deployed build, reachability or evidence. A catalog listing and a severity score do not establish exposure or compromise.
01 / Meaning
Why it matters
Published affected context helps an owner decide what evidence to gather. This report has not examined your application.
0.334%
FIRST EPSS model v2026.06.15; exploitation probability over 30 days, percentile 0.26912. Missing scores are unknown.
As of · FIRST EPSS
02 / Applicability
The affected context
Affected versions, configuration prerequisites and known exclusions are public. Confirm each one against the deployed service.
getkirby/cms
source listedECOSYSTEM: introduced 0; fixed 4.9.0
### TL;DR This vulnerability affects all Kirby sites that use option fields (`checkboxes`, `color`, `multiselect`, `select`, `radio`, `tags` or `toggles`) with options from a query or API whose values may not be fully trusted. It also affects direct uses of the `OptionsApi` or `OptionsQuery` classes of Kirby's `Options` package from plugin or site code. The attack requires either an attacker in the group of authenticated Panel users or user interaction of another authenticated user. **This vulnerability is of high severity for affected sites.** Users' Kirby sites are *not* affected if they are not using any of the mentioned fields or the `Options` package, if all options are defined statically in the blueprints or if all dynamically gathered options are to be trusted. ---- ### Introduction Server-Side Template Injection vulnerabilities (SSTI) occur when user input is embedded in a template in an unsafe manner and results in remote code execution on the server. Injected user input is wrongly treated as a template command instead of as a literal string of text. This allows attackers to query arbitrary information from the affected system or call arbitrary methods to perform ac
getkirby/cms
source listedECOSYSTEM: introduced 5.0.0; fixed 5.4.0
### TL;DR This vulnerability affects all Kirby sites that use option fields (`checkboxes`, `color`, `multiselect`, `select`, `radio`, `tags` or `toggles`) with options from a query or API whose values may not be fully trusted. It also affects direct uses of the `OptionsApi` or `OptionsQuery` classes of Kirby's `Options` package from plugin or site code. The attack requires either an attacker in the group of authenticated Panel users or user interaction of another authenticated user. **This vulnerability is of high severity for affected sites.** Users' Kirby sites are *not* affected if they are not using any of the mentioned fields or the `Options` package, if all options are defined statically in the blueprints or if all dynamically gathered options are to be trusted. ---- ### Introduction Server-Side Template Injection vulnerabilities (SSTI) occur when user input is embedded in a template in an unsafe manner and results in remote code execution on the server. Injected user input is wrongly treated as a template command instead of as a literal string of text. This allows attackers to query arbitrary information from the affected system or call arbitrary methods to perform ac
03 / Response
What to do next
- vendor patch
The original advisory lists fixed boundaries 4.9.0 for getkirby/cms. Confirm the publisher’s latest guidance.
Confirm current vendor support, compatibility and deployment evidence. This report has not tested a fix in your system. GitHub Advisory Database via OSV
- vendor patch
The original advisory lists fixed boundaries 5.4.0 for getkirby/cms. Confirm the publisher’s latest guidance.
Confirm current vendor support, compatibility and deployment evidence. This report has not tested a fix in your system. GitHub Advisory Database via OSV
- investigate
Identify the exact component and deployed version, examine the linked publisher’s conditions, and retain evidence of any mitigation.
Confirm current vendor support, compatibility and deployment evidence. This report has not tested a fix in your system. FIRST EPSS
A fixed release is not deployment evidence.
Check current vendor support and compatibility. After making a change, verify the deployed build and relevant runtime conditions. Keep the evidence, owner and time. An updated lockfile alone does not prove what is running.
04 / Limits
What this report cannot establish
- Customer inventory, deployment, reachability and exploitation have not been inspected.
05 / Provenance
Sources you can inspect
Each assertion retains its source. Mirrored records may repeat one underlying publisher; additional links are not independent corroboration.
- GHSA-jcjw-58rv-c452 ↗
GitHub Advisory Database via OSV · vendor advisory
Observed . GitHub-origin advisory, CC-BY-4.0; OSV is an aggregate copy, not independent corroboration.
- CVE-2026-34587 ↗
FIRST EPSS · official catalog
Observed . FIRST EPSS; probability of exploitation in the next 30 days, not local compromise. Dataset date/model retained; FIRST services terms apply.
Public revision history
Only published revisions appear here. Routine fetches do not create a material-change event.
- Revision 3 ·
Dated EPSS estimate updated; this is not a new disclosure or proof of exploitation.
- Revision 2 ·
Dated EPSS estimate updated; this is not a new disclosure or proof of exploitation.
- Revision 1 ·
First indexed by Null; source disclosure date is shown separately.