CVE-2026-45368
Persistent XSS via crafted URL schemes in Kirby editor-produced links.
Is CVE-2026-45368 being exploited?
Not confirmed. CVE-2026-45368 does not appear in CISA's Known Exploited Vulnerabilities catalog, which records only exploitation that has been observed and reported publicly. That is evidence of absence of a report, not evidence the flaw is unattacked. EPSS currently estimates a 0.53% probability of exploitation in the next 30 days.
How severe is CVE-2026-45368?
CVE-2026-45368 is rated High with a CVSS score of 8.4. Severity describes how bad exploitation would be, not how likely it is: pair it with exploitation evidence before deciding what to patch first.
Is there a patch for CVE-2026-45368?
Yes. A fix has been recorded for CVE-2026-45368. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2026-45368 affect?
CVE-2026-45368 affects Kirby CMS <4.9.1, Kirby CMS <5.4.1, KirbyTags (link:), (image:) link param, and 2 further products or versions. Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-45368?
Upgrade to Kirby 4.9.1 or 5.4.1; sanitize user-supplied links and review content inputs
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Persistent cross-site scripting: attacker-supplied scripts run in victims' browsers via editor links, enabling session theft, account takeover, malware delivery.
Immediate action required
- affected< 4.9.1
- affected>= 5.0.0 and < 5.4.1
As published in the CVE Program record. A version outside these ranges is not a statement that it is unaffected — vendors sometimes understate a range, and distribution-backported builds carry upstream numbers that do not reflect what was patched into them.