CVE-2026-64851
Stored XSS in Grav Shortcode Core plugin allows attribute injection by admin.pages users.
Is CVE-2026-64851 being exploited?
Not confirmed. CVE-2026-64851 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 0.43% probability of exploitation in the next 30 days.
How severe is CVE-2026-64851?
CVE-2026-64851 is rated High with a CVSS score of 8.5. 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-2026-64851?
Yes. A fix has been recorded for CVE-2026-64851. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2026-64851 affect?
CVE-2026-64851 affects Grav Shortcode Core plugin < 6.2.2, Grav CMS sites using Shortcode Core. Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-64851?
Upgrade Shortcode Core to 6.2.2 and review content created by admin.pages accounts.
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Stored XSS: an admin.pages account can inject event handlers that execute arbitrary JS in visitors' or admins' browsers, enabling session theft or actions as the victim.
Patch when possible
- affected< 6.2.2
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.