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.
CVE-2026-54002
HIGHPre-NVD 8.58.5—
EchelonGraph scoreMEDIUM confidence
This high-severity CVE scores 8.5 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.4%, top 67% of all CVEs by exploit prediction. GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).
Triggered by: NVD CVSS baseline
Sources: epss, secondary
8.5
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
- High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 0%CVSS: 8.5Exploit: NoneExposed: 0
No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.
- CVSS v3
- 8.5
- EG Score
- 8.5(medium)
- EG Risk
- —
- EPSS
- 33.4%
- KEV
- Not listed
Published
June 18, 2026
Last Modified
July 10, 2026
Advisory Details (7)
Auto-updated Jul 9, 2026Patch available. Sources: github_commit, github_release, github.
github Patch Available
Cross-site scripting (XSS) from incomplete HTML/XML sanitization in `Dom::sanitize()` · Advisory · getkirby/kirby · GitHub
https://github.com/getkirby/kirby/security/advisories/GHSA-wr9h-4r83-f4v6github_release Patch Available
5.4.4
Patch available: getkirby/kirby 5.4.4
https://github.com/getkirby/kirby/releases/tag/5.4.4github_release Patch Available
4.9.4
Patch available: getkirby/kirby 4.9.4
https://github.com/getkirby/kirby/releases/tag/4.9.4github_commit Patch Available
commit bb2562e16c75 (getkirby/kirby)
Patch available: getkirby/kirby 5.4.4 (contains commit bb2562e16c75)
https://github.com/getkirby/kirby/commit/bb2562e16c754493a403b8df84c9883108871e4cgithub_commit Patch Available
commit 9ec187386444 (getkirby/kirby)
Patch available: getkirby/kirby 5.4.4 (contains commit 9ec187386444)
https://github.com/getkirby/kirby/commit/9ec1873864441dbc06479ef7823da348ec7f2700github_commit Patch Available
commit 7ad76cf9c738 (getkirby/kirby)
Patch available: getkirby/kirby 4.9.4 (contains commit 7ad76cf9c738)
https://github.com/getkirby/kirby/commit/7ad76cf9c7387462828e6ebfc8404e31b37829e9github_commit Patch Available
commit 0f0437b5128c (getkirby/kirby)
Patch available: getkirby/kirby 4.9.4 (contains commit 0f0437b5128c)
https://github.com/getkirby/kirby/commit/0f0437b5128c910103cbc78fc34d94b2a3faef4cVendor Advisories for CVE-2026-54002(1)
These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.
Affected Packages
(1 across 1 ecosystem)
Packagist(1)
| Package | Vulnerable range | Fixed in | Dependents |
|---|---|---|---|
| getkirby/cms | 5.0.0 ... 5.4.3 (41 versions) | 5.4.4 | — |
Weakness Classification(2)
MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.
Data Freshness Timeline
(refreshed 6× in last 7d / 18× in last 30d)
Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.
- 2026-07-22 14:08 UTCEPSS rescore
- 2026-07-21 15:25 UTCEPSS rescore
- 2026-07-20 17:08 UTCEPSS rescore
- 2026-07-19 02:29 UTCEPSS rescore
- 2026-07-18 10:04 UTCEPSS rescore
- 2026-07-16 17:03 UTCEPSS rescore
- 2026-07-15 16:57 UTCEPSS rescore
- 2026-07-15 16:57 UTCEPSS rescore
- 2026-07-15 02:00 UTCEPSS rescore
- 2026-07-15 02:00 UTCEPSS rescore
- 2026-07-13 22:31 UTCEPSS rescore
- 2026-07-13 06:13 UTCEPSS rescore
- 2026-07-13 06:13 UTCEPSS rescore
- 2026-07-12 05:46 UTCEPSS rescore
- 2026-07-11 08:27 UTCEPSS rescore
- 2026-07-11 08:27 UTCEPSS rescore
- 2026-07-09 19:14 UTCEG score recompute▲ 8.50
- 2026-07-09 19:12 UTCMITRE cvelistV5CVSS v3 → 8.5 · CVSS v4 → 8.5
- 2026-06-18 15:08 UTCEG score recompute
Related CVEs(same CWE)
Frequently asked(5)
What is CVE-2026-54002?
CVE-2026-54002 is a high vulnerability published on June 18, 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()…
When was CVE-2026-54002 disclosed?
CVE-2026-54002 was first published in the National Vulnerability Database on June 18, 2026, with the most recent update on July 10, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-54002 actively exploited?
CVE-2026-54002 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 33.4% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2026-54002?
CVE-2026-54002 has a CVSS v3 base score of 8.5 (NVD).
How do I remediate CVE-2026-54002?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-54002, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.
Dependency Blast Radius
See which npm, PyPI, Go, and Maven packages are affected by CVE-2026-54002
Is Your Infrastructure Affected by CVE-2026-54002?
EchelonGraph automatically scans your cloud infrastructure and maps CVE exposure using blast radius analysis.