Answer in brief
CVE-2026-54002 records a High severity (CVSS 8.5) vulnerability in Kirby: Cross-site scripting (XSS) from incomplete HTML/XML sanitization in `Dom::sanitize()`. The current sources do not mark it as known exploited. The current feed maps getkirby/cms (composer), getkirby/cms (composer), getkirby/kirby (generic). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
CVSS is 8.5. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps getkirby/cms (composer), getkirby/cms (composer), getkirby/kirby (generic). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| getkirby/cmscomposer | <=4.9.3 | 4.9.4 |
| getkirby/cmscomposer | >=5.0.0-alpha.1,<=5.4.3 | 5.4.4 |
| getkirby/kirbygeneric | < 4.9.4 || >= 5.0.0, < 5.4.4 | Not reported |
Published upstream
Jul 9, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Jul 10, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Jun 19, 2026
Kirby is an open-source content management system. Prior to 4.9.4 and 5.4.4, Kirby sites and plugins that use the writer or list fields or call Dom::sanitize(), Sane::sanitize(), Sane::Html::sanitize(), Sane::Svg::sanitize(), Sane::Xml::sanitize(), Sane::sanitizeFile(), or file sanitizeContents() with untrusted input allow malicious markup injected as children of an unknown HTML or XML tag to pass through Dom::sanitize() without being correctly sanitized, causing stored cross-site scripting. This issue is fixed in versions 4.9.4 and 5.4.4.
Quoted source text, attributed separately from HOL analysis.