vulnerability / NVI-00007608 / Revision 4
Kirby CMS vulnerable to cross-site scripting (XSS) from links in KirbyTags and image blocks in the site frontend
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.
8.4 HIGH (4.0)
security-advisories@github.com severity; no combined Null risk score.
0.534%
FIRST EPSS model v2026.06.15; exploitation probability over 30 days, percentile 0.45102. 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 4.9.1
### TL;DR This vulnerability affects all Kirby sites that allow the use of the `(link: …)` KirbyTag, the `link:` parameter of the `(image: …)` KirbyTag, the built-in `image` block with a link or the HTML importer for blocks, when content is authored by users who may not be fully trusted. The attack requires an authenticated Panel user with update permission to any `textarea` or `blocks` field, or write access to content files through another vector (e.g. a frontend form or content sync pipeline). Another attack vector is the use of `Html::a()` or `Html::link()` with untrusted user input. **This vulnerability is of high severity for affected sites.** Kirby sites are *not* affected if none of the mentioned KirbyTags or block types are used, or if every user who can edit content is fully trusted. The attack only surfaces in the site frontend (i.e. in its templates). The Panel itself is unaffected and will not execute JavaScript that was injected into the `textarea` or `blocks` field content. --- ### Introduction Cross-site scripting (XSS) is a type of vulnerability that allows to execute any kind of JavaScript code inside the site frontend or Panel session of the same or other u
getkirby/cms
source listedECOSYSTEM: introduced 5.0.0; fixed 5.4.1
### TL;DR This vulnerability affects all Kirby sites that allow the use of the `(link: …)` KirbyTag, the `link:` parameter of the `(image: …)` KirbyTag, the built-in `image` block with a link or the HTML importer for blocks, when content is authored by users who may not be fully trusted. The attack requires an authenticated Panel user with update permission to any `textarea` or `blocks` field, or write access to content files through another vector (e.g. a frontend form or content sync pipeline). Another attack vector is the use of `Html::a()` or `Html::link()` with untrusted user input. **This vulnerability is of high severity for affected sites.** Kirby sites are *not* affected if none of the mentioned KirbyTags or block types are used, or if every user who can edit content is fully trusted. The attack only surfaces in the site frontend (i.e. in its templates). The Panel itself is unaffected and will not execute JavaScript that was injected into the `textarea` or `blocks` field content. --- ### Introduction Cross-site scripting (XSS) is a type of vulnerability that allows to execute any kind of JavaScript code inside the site frontend or Panel session of the same or other u
03 / Response
What to do next
- vendor patch
The original advisory lists fixed boundaries 4.9.1 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 5.4.1 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.
- NVD lastModified does not establish freshness of every associated CPE record.
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-qvjf-922g-pj44 ↗
GitHub Advisory Database via OSV · vendor advisory
Observed . GitHub-origin advisory, CC-BY-4.0; OSV is an aggregate copy, not independent corroboration.
- CVE-2026-45368 ↗
NIST National Vulnerability Database · official catalog
Observed . This product uses data from the NVD API but is not endorsed or certified by the NVD.
- CVE-2026-45368 ↗
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 4 ·
Source facts changed; compare the preserved prior revision.
- 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.